Dr Abhijit Guha  Résumé
and Research Publication List, PDF files and details of research findings are available below. Please scroll down. 


Calendar
2018 of American
Institute of Physics (AIP) features research of Prof
Abhijit Guha 
The name of Prof. Abhijit Guha appears within top 1% of world researchers compiled by leading scientists of Stanford University (Oct 2020). 
The celebrated journal Physics of Fluids showcases research of the group 2016 
Publication Statistics 20122017 IIT Kharagpur 
Dr R S
Pandey Distinguished Lecture 2017 IIT Kanpur 
Physics of
Fluids honours
again 2017 Physics of Fluids honours again 2019 
MTech/MEng
students publish in top journals 
Paper of
Prof Guha is still
3rd most
downloaded 48 months after publication in Jan 2013 
Aircraft Propulsion Aeronautical Journal Cover Article 2001 based on research carried out at University of Bristol 
Bio Fluid Dynamics Physics of Fluids Cover Article 2016 based on research carried out at IIT Kharagpur 
Turbulent
Multiphase Flow Annual Review of Fluid Mechanics 2008 based on research carried out at University of Cambridge 
Abhijit Guha obtained a
Bachelor of Engineering
degree from Jadavpur
University and a Master of Engineering from the Indian Institute of
Science (Bangalore). He then went to Trinity College,
University of
Cambridge, holding the Prince
of Wales Scholarship
(one scholarship across all disciplines
awarded to
the best candidate of all Commonwealth countries including U.K.) and an
Honorary Nehru
Scholarship (India), and received his PhD from the Engineering
department of University of Cambridge.
He was a Senior Rouse Ball
Scholar
at Trinity College during 198990. In 1990 a number
of top Cambridge colleges simultaneously offered him the rare
distinguished opportunity of becoming a Fellow at those colleges; he
accepted the offer from Gonville & Caius College
and became a Fellow there. While at Cambridge, his
research was based at the Whittle Laboratory.
In 1995 he
became a permanent Faculty member at the
Aerospace Engineering department of the University
of Bristol
(the city of Bristol hosting the largest concentration of aerospace
and related industries in Europe, including Airbus, Rolls Royce,
AgustaWestland
Helicopter, BAE Systems). He
joined the Mechanical Engineering department of the Indian
Institute of Technology
(IITKharagpur) as a
Professor in 2009. Professor Guha has been accorded the Honorary status
of Visiting Fellow at the Faculty of Engineering at University of
Bristol in 2012 (20122015).

His
research interests lie
in the
areas of thermofluiddynamics of twophase flow, transport
and deposition of particles, heat and mass transfer, gas turbine
&
energy, environment, fluid dynamics, biological fluid dynamics and
computational
fluid dynamics. In 1993 and 1994 he delivered short courses at
the Czech Academy
of
Sciences. In 1995 he delivered the prestigious VKI Lecture
Series at
the von Karman
Institute in Belgium. In 2000 he
was elected to the Editorial
Board of Journal of Aerosol Science. In
2008 he was invited to contribute to the Annual Review of Fluid
Mechanics. He
has delivered Keynote Lectures at International conferences, including
the 2002 ASME/ISHMT international conference on Heat and Mass Transfer.
He is a regular reviewer for several international journals. The name
of Abhijit Guha appears within top 1% of world researchers
compiled by leading scientists of Stanford University
and published in October 2020. He is the recipient of the firstever Teaching Excellence Award 2003 for the whole of Faculty of Engineering (containing several departments) at University of Bristol. University of Bristol introduced this scheme in 2003 and awards this prize to one member in each Faculty each year. 
MULTIPHASE
FLOW (CFD and
Analysis) Link for Coloured Contours 

Keynote Speech 2002 ISHMT/ASME Int Conf 
Keynote Speech 1995 IISc Golden Jubilee Int Conf 
Short Courses 1993, 1994 Czech Academy of Sciences 
Previous
successful projects covered diverse topics of engineering as
well
as of fundamental importance. The outcome
of these projects has appeared in seminal Journals and major
conferences.
The research work involves modelling the flow of multiphase mixtures  either solidparticleladengases or vapourdroplet mixtures, e.g. moist air,  through a combination of numerical calculations (Computational Fluid Dynamics) and theoretical analysis. This is an interdisciplinary research area requiring synthesis of ideas from several fields such as fluid mechanics, thermodynamics, and, heat and mass transfer. Currently experiments are being conducted on condensation in microchannels and direct contact condensation. Examples of previous successful projects include :
Guha's Generalized Equations for Particle Transport and Deposition The
equations are valid for laminar
to turbulent
flow, and, for wide range of
particle size (nanoparticles
to large
millimetersized particles). The theory includes
the effects of inertia,
Brownian
diffusion, thermophoresis,
turbophoresis,
electrical
and other body forces,
gravity,
shearinduced
lift, surface
roughness, and corrections due to Knudsen effect
or finite slip
Reynolds number. These equations reduce to the well known
relations in
the appropriate limits. Thus, for example, Fick's law of diffusion or
the currently popular equations for the motion of nanoparticles
can be viewed
as subsets of the unified
advectiondiffusion theory
derived. Experiments show that the deposition velocity varies
differently with the size of particle in different ranges of
particle size and it can vary by several orders of magnitude as
particle size is altered. In the past, separate theories were needed in
different particle size ranges and it would have been difficult to
apply the theories to flow situations that are different from the
situations for which the parameters of the theories were tuned. The
unified advectiondiffusion theory thus settles the quest over previous
fifty years in the field for a physicsbased explanation for
the
observed complex behaviour of particle transport.
J.
Aerosol Science
Annual
Review of Fluid Mechanics
A New (Stochastic) Theory of Nucleation of Water Droplets in Multistage Steam Turbine Used Globally for Electricity Generation Nonequilibrium Condensation with Stochastic Fluctuation due to Wake Segmentation in a Multistage Machine Philosophical Transactions of the Royal Society The
essence of the theory is that largescale
static temperature fluctuations caused by the segmentation of
bladewakes by
successive bladerows have a dominating influence on nucleation and
droplet
growth in turbines. "True"
turbulent fluctuations (due to shearlayer unsteadiness, etc.) are
probably
less important and are ignored. A
Lagrangian frame of reference is adopted and attention is focussed on a
large
number of individual fluid particles during their passage through the
turbine. Homogeneous
nucleation and
growth of droplets in each fluid particle is assumed to be governed by
classical theories. All
fluid particles
are assumed to experience the same pressure variation but those
particles
passing close to the blade surfaces suffer greater entropy production
and
therefore have higher static temperatures than those which pursue
nearisentropic paths through the central portions of the blade
passages. Particles
which suffer high loss therefore
nucleate later in the turbine than those which experience little
dissipation. Condensation
is thus viewed
as an essentially random and unsteady phenomenon as the dissipation
experienced
by a fluid particle in one bladerow is assumed to be uncorrelated with
its
previous history. On
a timeaveraged
basis, the condensation zone is spread over a much greater distance in
the flow
direction than a simple steadyflow analysis would indicate and may
encompass
several bladerows depending on the number of stages in the machine. Predicted droplet size
spectra show broad,
highlyskewed distributions with large mean diameters and sometimes
slight
bimodality. These
are all
characteristics of experimentally measured spectra in real turbines. Conventional, steadyflow
calculation
methods, which predict a fixed Wilson point in a specific bladerow and
a
nearmonodispersed droplet population, cannot reproduce any of these
characteristics.
Relaxation Processes, and Steady and Moving Shock Wave Structure in TwoPhase VapourDroplet Flow JFM 1991 JFM1992 PhysicsFluids1992 PhysicsFluids1994 IUTAM1990 ISTPIV1991 The
structures
of stationary and moving fully and partly dispersed shock
waves in
vapourdroplet, twophase flow are studied. The relaxation processes
corresponding to the interphase transfer of mass, momentum and energy
are analyzed. Pure substances
only are considered, but, unlike most previous work, the droplet
population is
allowed to be polydispersed. It is shown how the effects of thermal
relaxation
for such a mixture can be elegantly incorporated into the analysis.
Three types of fully dispersed wave are identified. Type I waves are dominated by thermal relaxation and an approximate analytical solution is presented which gives results in close agreement with accurate numerical solutions of the governing equations. The analysis predicts some unexpected behaviour of the thermodynamic variables and demonstrates the correct scaling parameters for such flows. An approximate analysis is also presented for Type II waves, dominated by both velocity and thermal relaxation. Type III waves, where all three relaxation processes are important, are of little practical significance and are only briefly discussed. Partly dispersed waves are also considered and the results of a numerical simulation of the relaxation zone are presented. A linearised solution of this problem is possible but, unlike other relaxing gas flows, does not give good agreement with the more exact numerical calculations. The apparent discontinuity in the speed of sound in a vapourdroplet mixture as the wetness fraction tends to zero has been responsible for some confusion in the literature. This problem is resolved and it is shown that the transition from the twophase equilibrium to the singlephase frozen speed of sound is continuous. RankineHugoniot relations for wet vapour giving jump conditions across shock waves have been derived. Different types of transition have been identified (JFM1992, PhysFluids1994). Mechanisms of entropy production inside a shock wave in wet vapour have been discussed. The unsteady processes through which a partlydispersed shock wave or a fullydispersed wave attains its stable, steady structure have been computed. CFD solutions include:
TimeMarching Computation of Steady and Unsteady Wet Steam Flow (Nonequilibrium Condensation Shock)
A Unified Theory for the Interpretation of Total Pressure and Total Temperature in TwoPhase Flow Proceedings of Royal Society ASME J Fluids Engineering A unified
theory on the
interpretation of total pressure and total temperature in multiphase
flows has been developed. The
present approach applies to both vapourdroplet mixtures and solid
particle
laden gases, and at subsonic as well as supersonic velocities. It is
shown here
that the nonequilibrium processes occurring in the vicinity of a
stagnation
point are important. These processes may be responsible for the
generation of
entropy and affect the pressure and temperature at the stagnation
point. They
should be properly considered while inferring, say, flow velocity or
entropy
generation from Pitot measurements. By proper nondimensionalization of
the
relevant parameters, it is possible to find a single (theoretically
obtained)
calibration curve for the total pressure as a function of the particle
size,
which is almost independent of the constituents of the multiphase
mixture and
of the flow conditions. The calibration curve is a plot of a pressure
recovery
factor versus Stokes number and specifies the total pressure under
different
nonequilibrium conditions. The total pressure, predicted by the present
theory,
varies monotonically between the two limiting values : the frozen total
pressure (when there is no interphase mass, momentum and energy
transfer in the
decelerating flow towards the stagnation point) and the equilibrium
total pressure
(when the dispersed phase, either the liquid droplets or the solid
particles,
is always at inertial and thermodynamic equilibrium with the continuous
vapour
phase). The equilibrium total pressure is always higher than the frozen
total
pressure. It is shown that the equilibrium total temperature, on the
other
hand, may be higher or lower than the frozen total temperature. In
addition,
unlike the case of total pressure, the calibration curve for total
temperature
is not so universal, and the total temperature under nonequilibrium
conditions
is not necessarily bounded between the frozen and equilibrium values.
It is
further shown that the entropy of a multiphase mixture has to be
carefully
interpreted and is not unequivocally related to the total pressure even
in
steady, adiabatic flow.
An explicit analytical theory as well as comprehensive numerical solutions of the governing equations are available. Thermal Choking due to Nonequilibrium Condensation ASME J Fluids Engineering

Topics
of
continuing interest

Effects of
Thermophoresis on the Motion of MicroNano Particles in Natural Convective Flow Int. J. Heat and Mass Transfer, vol 68, January 2014, p. 4250. J. Aerosol Science, vol 77, 2014, p. 85101. 

Topics of Current Interest : 
Particle transport in human lung 

Nonequilibrium Condensation Mach Contour (Click to enlarge) 
Nonequilibrium Condensation Wetness Fraction Contour (Click to enlarge) 
Self Adaptive Grid (Click to enlarge) 

Natural convection of regular
fluids, nanofluids, nonNewtonian fluids

Computational Biology
with FluidStructure interaction 
Computation of particle
transport
in human lung 
CFD of
rotating fluid flow in a
Tesla disc turbine (computed contours of tangential velocity, radial velocity, pressure and pathlines) 
Computation
of fluid dynamics and performance of a microturbine
(First CFD simulation of a microturbine, a concept developed at MIT.) 
CFD of
interacting wall and
offset
turbulent jets 
Computation
of indoor air quality
(The figure shows computed CO concentration inside a large kitchen in the campus) 
Outofplane velocity in natural convection 
Nonequilibrium Condensation Mach Contour (Click to enlarge) 
Nonequilibrium Condensation Wetness Fraction Contour (Click to enlarge) 

Effects of
finitenes on natural convection 
CFD (unsteady
timemarching) prediction of moving shock waves in twophase wet
vapour
in pistonandcylinder arrangement showing the effects of relaxation
gas dynamics.

Unsteady
computation of wake
segmentation in multistage turbine

Unsteady nonequilibrium condensation 
Monte Carlo Simulation of Homogeneous Condensation 
Physics of Fluids, vol 28(1), 2016, p. 0136011:30. DOI: 10.1063/1.4937590 (30 pages) 
Physics of Fluids,
vol 28(10),
2016, p.103601  1:19 

The power of similitude and dimensional analysis is combined here with the power of computational fluid dynamics to achieve a generalized physical understanding from a large set of accurate numerical simulations. 
Physics of Fluids,
vol 29(9),
2017, p.093604  1:13 
Physics of Fluids,
vol 28(12), 2016, p.123602:
132.
DOI: 10.1063/1.4971315 (32 pages) Velocity: InPlane configuration Velocity: OutofPlane configuration 
GAS TURBINE
AND ENERGY (Gas Turbine, Tesla Turbine, Solar Energy, Biofuel) 
Gas Turbine
Performance and
Optimisation A systematic methodology for the thermodynamic optimisation of civil bypass engines (turbofan or advanced propulsors) has been developed. Guha's
Methodology: Computation of performance of a
given gas turbine engine is well
established. The research work of A Guha addresses the complementary
question  how to design the best gas turbine engine for a specified
task. A new systematic methodology for optimisation of civil turbofan
engines has been developed. The work addresses the importance of
nonperfect gas properties. Analytical formulae have been derived for
determining optimum fan pressure ratio, optimum ratio of cold and hot
jet velocities, optimum ratio of mean jet velocity and aircraft speed,
etc. The work establishes new concepts such as the existence of true
thermodynamic optimum values of the bypass ratio and the maximum
temperature in the cycle. The work is interdisciplinary in nature,
including economics. As an example, it is shown how to determine the
optimum specific thrust (for a given mission) from a direct engine cost
(DEC) analysis.
In the new methodology, the optimum combination of overall parameters (FPR, OPR, TET, B) is determined concurrently that maximizes the overall efficiency while maintaining the specific thrust at a predetermined value established from a direct operating cost (DOC) analysis. This is very different from the parametric studies (available in the literature) where the effects of the variation of a single variable are calculated numerically while all other variables are kept fixed  therefore at their nonoptimum levels. The parametric studies are thus not capable of finding the true optimum combination. Moreover, often such parametric studies may involve a large excursion in the value of the specific thrust which is unacceptable for a particular mission. So, even with the availability of a computational package, the present methodology offers a more logical approach. Additionally, several, simple and explicit, new analytical relations have been derived here that accelerate the optimisation process and offer physical insight. With these, the optimisation can be undertaken with hand calculations at the initial phase of a real design process and can also be treated realistically in a textbook. Work in progress: Analysis of the cooling of turbine blades in aero gas turbines. (This work is being conducted in collaboration with RollsRoyce.) Optimisation of aero gas turbine engines, Aeronautical Journal, vol. 105, no. 1049, July 2001, p. 345358. Design Space of Optimised Turbofan Gas Turbine Engines: Past, Present, Future Optimisation of aero gas turbine engines, Aeronautical Journal, vol. 105, no. 1049, July 2001, p. 345358. 

Discovery
of a new concept  the existence of optimum turbine entry temperature IMechE Proc., Part A, J. Power and Energy, vol 215, no A4, 2001, p. 507512 
Deduced
explicit analytical formulae AIAA J Propulsion and Power, vol 17, no. 5, SeptOct 2001, p.11171122. 
IMechE
Proc., Part C, J. Mechanical Engineering Science,
vol
217, no A4, 2003, p. 10851099 
IMechE
Proc., Part A, J. Power and Energy,
vol. 215, no. A3,
2001, p. 375387. 
TESLA TURBOMACHINE Topics of Current Interest : Development of a flexible test facility for Tesla turbines and compressors. Systematic study of performance and efficiency. Development of a theoretical model Computational Fluid Dynamics Solutions Fundamental study of the fluid dynamics of rotating flow (This work is supported by a grant from RollsRoyce.) IMechE Proc., Part A, J. Power and Energy, vol 223 (A4), 2009, p451465. (15 pages) 
IMechE Proc., Part A, J. Power and Energy, vol 224, no. A2, 2010, p.261277. (17 pages) 
IMechE Proc., Part A, J. Power and Energy, vol 226 (5), 2012, p650663. (14 pages) European J. of Mechanics B/Fluids, vol. 37, 2013, p.112123. (12 pages) IMechE Proc., Part A, J. Power and Energy, vol 228(4), 2014, p. 429439. (11 pages) 
Physics of Fluids, vol 26, 2014, 0336011:27. (27 pages) 
Physics of Fluids, vol 26, 2014, 0336011:27. (27 pages) 

IMechE
Proc., Part A, J.
Power and Energy, vol 231(8) , 2017, p. 721738
(18 pages). IMechE Proc., Part A, J. Power and Energy, vol 232, 2018, p. (21 pages). 
Solar Energy Modelling of timedependent performance of a solar pond for a whole year. Study of the effect of bottom reflectivity and slope of side walls on the performance of a small solar pond. Study of doublediffusive convection. Solar Energy, vol. 39, no. 4, 1987, p 361367. Solar Energy, vol. 38, no. 2, 1987, p 135136. 
ENVIRONMENT 
Experiments on the performance
and emission of an IC engine with various biofuels 
Experiments and computations of indoor air quality
The example figure shows the measured contours of CO2 in a large
kitchen in the campus.
Building and Environment, vol 52, 2012, p.177190. The example figure shows the
measured concentration of CO in four large
kitchens in the campus.

• Prediction of NOx emission in
turbofan engines • Optimisation and design synthesis of turbofan engines. • Design and optimization of a new turbofan engine with alternative fuel (hydrogen) to meet ACARE 2020 goals. AIAA J. Propulsion and Power, vol 28, no. 1, JanFeb 2012, p.170180. IMechE Proc., Part G, J. Aerospace Engineering, vol 227, November 2013, p. 17011719. IMechE Proc., Part G, J. Aerospace Engineering, vol 227, Issue 3, March 2013, p. 502527. 
Solar
Energy
• Modelling of timedependent performance of a solar pond for a whole year. • Study of the effect of bottom reflectivity and slope of side walls on the performance of a small solar pond. • Study of doublediffusive convection. Solar
Energy, vol. 39, no. 4, 1987, p 361367.
Solar Energy, vol. 38, no. 2, 1987, p 135136. 
Sustainable AeroEngine with Alternative Fuel
(Hydrogen) Development and optimization of a sustainable turbofan aeroengine for improved performance and emissions, IMechE Proc., Part G, J. Aerospace Engineering, vol 227, November 2013, p. 17011719. 
Following Guha's optimisation method [Aeronautical Journal, 2001], an optimisation scheme is devised for the sustainable turbofan concept to minimize the fuel consumption. The optimisation results shown in Figure 4 represent the possible design space of an aeroengine based on the sustainable turbofan cycle developed here, the four specific thrusts chosen representing broadly the past, present, nearfuture and distantfuture. 
TOPICS WITH
REPRESENTATIVE PUBLICATIONS OF A GUHA Full Publication List and PDF files are available below. Please scroll down. 



Turbulent
Transport of Particles (Fickian diffusion, thermophoresis, turbophoresis, electrical force, gravity, surface roughness) 
A
unified Eulerian theory of turbulent deposition to smooth and rough
surfaces, J. Aerosol Science, vol. 28, no. 8, 1997, p. 15171537. (21 pages) Transport and deposition of particles in turbulent and laminar flow, Annual Review of Fluid Mechanics, vol 40, 2008, p. 311341. (31 pages) A paper in Annual Review of Fluid Mechanics is considered a top accolade in the field. 

Thermophoresis  Effect
of thermophoresis and its mathematical models on the transport and
deposition of aerosol particles in natural convective flow on vertical
and horizontal plates, J. Aerosol Science, vol 77, 2014, p. 85101 . DOI: 10.1016/j.jaerosci.2014.06.005 (17 pages) Effect of thermophoresis on the motion of aerosol particles in natural convective flow on horizontal plates, Int. J. Heat and Mass Transfer, vol 68, January 2014, p. 4250. DOI: 10.1016/j.ijheatmasstransfer.2013.08.046 (9 pages) A unified Eulerian theory of turbulent deposition to smooth and rough surfaces, J. Aerosol Science, vol. 28, no. 8, 1997, p. 15171537. (21 pages) 

Novel
Theory of Nucleation (with CFD) Nonequilibrium Condensation Wet Steam 
The
effect of flow unsteadiness on the homogeneous nucleation of water
droplets in steam turbines, Philosophical Transactions A of The Royal Society, vol. 349, 1994, p. 445472. (28 pages) Timemarching prediction of unsteady condensation phenomena due to supercritical heat addition, In Turbomachinery : Latest Developments in a Changing Scene, London, IMechE, 1991, p. 167177. (ISBN 0852987617) Thermal choking due to nonequilibrium condensation, ASME Journal of Fluids Engineering, vol. 116, 1994, p 599604. A unified theory of aerodynamic and condensation shock waves in vapourdroplet flows with or without a carrier gas, Physics of Fluids, vol 6, no 5, 1994, p 18931913. (21 pages) TwoPhase Flows with Phase Transition, In VKI Lecture Series 199506, von Karman Institute for Fluid Dynamics, Belgium, 1995, p 1110. (ISSN 03778312) Computation, analysis and theory of twophase flows, The Aeronautical Journal, vol. 102, No. 1012, 1998, p. 7182. https://doi.org/10.1017/S0001924000065556 (12 pages). 

Fluid Dynamics in Branching Network BioFluidDynamics 
Finding
order in complexity: A study of
the fluid dynamics in a threedimensional branching network, Physics of Fluids, vol 28(12), 2016, p.123602: 132. DOI: 10.1063/1.4971315 (32 pages) This Paper was showcased by Physics of Fluids as "FEATURED ARTICLE". The COVER PAGE of the December 2016 Issue of Physics of Fluids is based on this Paper. This is the FIRST TIME the celebrated journal has changed its Cover Page since 1994. Secondary motion in threedimensional branching networks, Physics of Fluids, vol 29(6), 2017, p.063602: 124. DOI: 10.1063/1.4984919 (24 pages). This Paper was highlighted by Physics of Fluids as "Editor's Pick". Fluid dynamics of oscillatory flow in threedimensional branching networks, Physics of Fluids, vol 31(6), 2019, p.063601  1:29. DOI: 10.1063/1.5093724 (29 pages). This Paper was highlighted by Physics of Fluids as "Editor's Pick". Fluid dynamics of a bifurcation, Int. J. Heat and Fluid Flow, vol 80, December Issue, 2019, Paper 108483, p.129 DOI: 10.1016/j.ijheatfluidflow.2019.108483 (29 pages). A systematic study of blockage in threedimensional branching networks with an application to model human bronchial tree, Theoretical and Computational Fluid Dynamics, vol 34, 2020, p. 301332, DOI: 10.1007/s00162020005231 (32 pages). 

Optimisation
and Performance of Gas Turbine Engines 
Determination
of optimum specific thrust for civil aero gas turbine engines: a
multidisciplinary design synthesis and optimisation, IMechE Proc., Part G, J. Aerospace Engineering, vol 227, Issue 3, March 2013, p. 502527. DOI: 10.1177/0954410011435623. (26 pages) Optimisation of aero gas turbine engines, Aeronautical Journal, vol. 105, no. 1049, July 2001, p. 345358. https://doi.org/10.1017/S0001924000012264 (14 pages) The COVER PAGE of the July 2001 Issue of Aeronautical Journal is based on this Paper. Performance and optimisation of gas turbines with real gas effects, IMechE Proc., Part A, J. Power and Energy, vol 215, no A4, 2001, p. 507512. An efficient generic method for calculating the properties of combustion products, IMechE Proc., Part A, J. Power and Energy, vol. 215, no. A3, 2001, p. 375387. (13 pages) Optimum fan pressure ratio for bypass engines with separate or mixed exhaust streams, AIAA J Propulsion and Power, vol 17, no. 5, SeptOct 2001, p.11171122. Effects of internal combustion and nonperfect gas properties on the optimum performance of gas turbines, IMechE Proc., Part C, J. Mechanical Engineering Science, vol 217, no A4, 2003, p. 10851099. (15 pages) Development and optimization of a sustainable turbofan aeroengine for improved performance and emissions, IMechE Proc., Part G, J. Aerospace Engineering, vol 227, November 2013, p. 17011719. DOI: 10.1177/0954410012462183. (19 pages) 

Performance of Tesla Disc Turbine  The
fluid dynamics of work transfer in
the nonuniform viscous rotating flow within a Tesla disc turbomachine, Physics of Fluids, vol 26(3), 2014, 0336011:27. DOI: 10.1063/1.4866263 (27 pages).The fluid dynamics of the rotating flow in a Tesla disc turbine, European Journal of Mechanics B/Fluids, vol. 37 (January_February), 2013, p.112123. DOI:10.1016/j.euromechflu.2012.08.001. (12 pages) The Paper is 3rd most downloaded even 48 months after its publication! InflowRotor interaction in Tesla Disc Turbines: Effects of discrete inflows, finite disc thickness and radial clearance on the fluid dynamics and performance of the turbine, IMechE Proc., Part A, J. Power and Energy, vol 232(8), 2018, p. 971991. DOI: 10.1177/0957650918764156 (21 pages). A nondimensional study of the flow through corotating discs and performance optimization of a Tesla disc turbine, IMechE Proc., Part A, J. Power and Energy, vol 231(8), 2017, p. 721738. DOI: 10.1177/0957650917715148 (18 pages). Flow of a nanofluid in the microspacing within corotating discs of a Tesla turbine, Applied Mathematical Modelling, vol 40, 2016, p. 485499. DOI: 10.1016/j.apm.2015.05.012 (15 pages). A theory of Tesla disc turbines, IMechE Proc., Part A, J. Power and Energy, vol. 226(5), 2012, p.650–663. DOI: 10.1177/0957650912446402 (14 pages). Similitude and scaling laws for the rotating flow between concentric discs, IMechE Proc., Part A, J. Power and Energy, vol 228(4), 2014, p. 429439. DOI: 10.1177/0957650914523947 (11 pages) Experiment and analysis for an improved design IMechE Proc., Part A, J. Power and Energy, vol 224, no. A2, 2010, p.261277. DOI: 10.1243/09576509JPE818. (17 pages) Design of a test rig and study of the performance and efficiency of a Tesla disc turbine. IMechE Proc., Part A, J. Power and Energy, vol 223, no. A4, 2009, p.451465. DOI: 10.1243/09576509JPE664. (15 pages) Analytical and computational solutions for threedimensional flowfield and relative pathlines for the rotating flow in a Tesla disc turbine, Computers and Fluids, vol 88, 2013, p.344353. DOI: 10.1016/j.compfluid.2013.09.008 (10 pages) The fluid dynamics of symmetry and momentum transfer in microchannels within corotating discs with discrete multiple inflows, Physics of Fluids, vol 29(9), 2017, p.093604  1:13. DOI: 10.1063/1.5001252 (13 pages). 

Nanofluid  Flow
of a nanofluid in the microspacing
within corotating discs of a Tesla turbine, Applied Mathematical Modelling, vol 40, 2016, p. 485499. DOI: 10.1016/j.apm.2015.05.012 (15 pages). Natural convective boundary layer flow of nanofluids above an isothermal horizontal plate, ASME J. Heat Transfer, vol. 136, October 2014, 1025011 : 1025018. DOI: 10.1115/1.4027909 (8 pages). Natural convection above a horizontal plate in a nanofluid saturated porous medium with or without a magnetic field, J. Porous Media, vol 18 (6), 2015, p. 613628. DOI: 10.1615/JPorMedia.v18.i6.50 (16 pages) 

NonNewtonian Fluid Flow  Analysis
of von Kármán’s swirling flow
on a rotating disc in Bingham fluids, Physics of Fluids, vol 28(1), 2016, p. 0136011:30. DOI: 10.1063/1.4937590 (30 pages). Natural convection of nonNewtonian powerlaw fluids on a horizontal plate, Int. J. Heat and Mass Transfer, vol 70, March 2014, p. 930938. DOI: 10.1016/j.ijheatmasstransfer.2013.11.001 (9 pages). 

Environment, Emission, Indoor Air  Development
and optimization of a
sustainable turbofan aeroengine for improved performance and emissions, IMechE Proc., Part G, J. Aerospace Engineering, vol 227, November 2013, p. 17011719. DOI: 10.1177/0954410012462183. (19 pages) Experimental and computational investigation of indoor air quality inside several community kitchens in a large campus, Building and Environment, vol 52, 2012, p.177190. DOI: 10.1016/j.buildenv.2011.10.015 . (14 pages) Study of prediction methods for NOx emission from turbofan engines, AIAA J. Propulsion and Power, vol 28, no. 1, JanFeb 2012, p.170180, DOI: 10.2514/1.B34245. (11 pages) 

Alternative
Fuel BioFuel, Hydrogen 
Development
and
optimization of a sustainable turbofan aeroengine for improved
performance and emissions,
IMechE Proc., Part G, J. Aerospace Engineering, vol 227, November 2013, p. 17011719. DOI: 10.1177/0954410012462183. (19 pages) 

Natural Convection Forced Convection Mixed Convection 
Effects of finiteness on the
thermofluiddynamics of natural convection above horizontal plates, Physics of Fluids, vol 28(6), 2016, p. 063603  1:29. DOI: 10.1063/1.4953382 (29 pages). The thermofluiddynamics of natural convection around a heated a vertical plate with a critical assessment of the standard similarity theory, Physics of Fluids, vol 29(10), 2017, p. 103607  1:17. DOI: 10.1063/1.4990279 (17 pages). Computation and physical explanation of the thermofluiddynamics of natural convection around heated inclined plates with inclination varying from horizontal to vertical, Int. J. Heat and Mass Transfer, vol 135, June 2019, p. 11301151. DOI: 10.1016/j.ijheatmasstransfer.2019.01.054 (22 pages). Correction for semiinfinite assumption in the theories of natural convection and determination of average Nusselt number for finite inclined plates, Int. J. Thermal Sciences, vol 148, February Issue, 2020, Paper 106062, p.118 DOI: 10.1016/j.ijthermalsci.2019.106062 (18 pages). A unified integral theory of laminar natural convection over surfaces at arbitrary inclination from horizontal to vertical, Int. J. Thermal Sciences, vol 111, 2017 January, p.475490. DOI: 10.1016/j.ijthermalsci.2016.08.011 (16 pages). Nonlinear interaction of buoyancy with von Kármán’s swirling flow in mixed convection above a heated rotating disc, Int. J. Heat and Mass Transfer, vol 108, May 2017, p. 402416. DOI: 10.1016/j.ijheatmasstransfer.2016.11.082 (15 pages). Closedform analytical solutions for laminar natural convection on horizontal plates, ASME J. Heat Transfer, vol. 135, October 2013, 1025011 : 1025019. DOI: 10.1115/1.4024430 (9 pages) Effect of thermophoresis and its mathematical models on the transport and deposition of aerosol particles in natural convective flow on vertical and horizontal plates, J. Aerosol Science, vol 77, 2014, p. 85101 . DOI: 10.1016/j.jaerosci.2014.06.005 (17 pages) A similarity theory for natural convection from a horizontal plate for prescribed heat flux or wall temperature, Int. J. Heat and Mass Transfer, vol 55, Issues 1314, June 2012, p. 38573868. DOI: 10.1016/j.ijheatmasstransfer.2012.02.031. (12 pages) A similarity theory for forced convection over horizontal plates, AIAA J. Thermophysics and Heat Transfer, vol 27, no. 3, JulySeptember 2013, p. 506514. DOI: 10.2514/1.T4033 (9 pages) Magnetohydrodynamic free convection flow over a horizontal isothermal flat plate, Communications in Nonlinear Science and Numerical Simulation, vol 18, December 2013, p. 34073422,. DOI: 10.1016/j.cnsns.2013.04.023. (16 pages) Analysis of heat transfer and stability of magnetohydrodynamic natural convection above a horizontal plate with heat flux boundary condition, Int. J. Heat and Mass Transfer, vol 70, March 2014, p. 793802. DOI: 10.1016/j.ijheatmasstransfer.2013.10.049 (10 pages) Natural convection above a horizontal plate in a nanofluid saturated porous medium with or without a magnetic field", J. Porous Media, vol 18 (6), 2015, p. 613628. DOI: 10.1615/JPorMedia.v18.i6.50 (16 pages) CFD solutions for magnetohydrodynamic natural convection over horizontal and vertical surfaces, J. Molecular Liquids, vol 236, 2017, p. 465476. DOI: 10.1016/j.molliq.2017.03.110 (12 pages). Natural convection of nonNewtonian powerlaw fluids on a horizontal plate, Int. J. Heat and Mass Transfer, vol 70, March 2014, p. 930938. DOI: 10.1016/j.ijheatmasstransfer.2013.11.001 (9 pages). Effect of thermophoresis on the motion of aerosol particles in natural convective flow on horizontal plates, Int. J. Heat and Mass Transfer, vol 68, January 2014, p. 4250. DOI: 10.1016/j.ijheatmasstransfer.2013.08.046 (9 pages) 

Fluid Dynamics of Rotating Flow  The
physics of pressure variation in
microchannels within corotating or static discs, Physics of Fluids, vol 28(10), 2016, p.103601  1:19. DOI: 10.1063/1.4963370 (19 pages). This Paper was highlighted by Physics of Fluids as "Editor's Pick". Analysis of von Kármán’s swirling flow on a rotating disc in Bingham fluids, Physics of Fluids, vol 28(1), 2016, p. 0136011:30. DOI: 10.1063/1.4937590 (30 pages). The fluid dynamics of symmetry and momentum transfer in microchannels within corotating discs with discrete multiple inflows, Physics of Fluids, vol 29(9), 2017, p.093604  1:13. DOI: 10.1063/1.5001252 (13 pages). The fluid dynamics of work transfer in the nonuniform viscous rotating flow within a Tesla disc turbomachine, Physics of Fluids, vol 26(3), 2014, 0336011:27. DOI: 10.1063/1.4866263 (27 pages). The fluid dynamics of the rotating flow in a Tesla disc turbine, European Journal of Mechanics B/Fluids, vol. 37 (January_February), 2013, p.112123. DOI:10.1016/j.euromechflu.2012.08.001. (12 pages) Similitude and scaling laws for the rotating flow between concentric discs, IMechE Proc., Part A, J. Power and Energy, vol 228(4), 2014, p. 429439. DOI: 10.1177/0957650914523947 (11 pages) Nonlinear interaction of buoyancy with von Kármán’s swirling flow in mixed convection above a heated rotating disc, Int. J. Heat and Mass Transfer, vol 108, May 2017, p. 402416. DOI: 10.1016/j.ijheatmasstransfer.2016.11.082 (15 pages). 

Mass Transfer  A generalized mass
transfer law unifying various particle transport mechanisms, Heat Mass Transfer, vol 44, 2008, p. 12891303. DOI:10.1007/s0023100803695 (15 pages) 

CFD of Unsteady Interaction of Two Turbulent Jets  Numerical
investigation of steady and periodically unsteady flow for
various separation distances between a wall jet and an offset jet, J. Fluids and Structures, vol 50, 2014, p. 528546 . DOI: 10.1016/j.jfluidstructs.2014.07.009 (19 pages). Periodic vortex shedding phenomenon for various separation distances between two plane turbulent parallel jets, Int. J. Heat and Mass Transfer, vol 99, 2016, p. 576588, DOI: 10.1016/j.ijheatmasstransfer.2016.03.095 (13 pages). Transition of a steady to a periodically unsteady flow for various jet widths of a combined wall jet and offset jet, ASME J. Fluids Engineering, vol 138(7), 2016, 071206:111, DOI: 10.1115/1.4032750 ( 11 pages). Analysis of conjugate heat transfer for combined wall jet and offset jet, ASME J. Heat Transfer, vol 138(5), 2016, 0517011:13. DOI: 10.1115/1.4032287 ( 13 pages). 

CFD of Twophase Flow  TwoPhase
Flows with Phase Transition, In VKI Lecture Series 199506, von Karman Institute for Fluid Dynamics, Belgium, 1995, p 1110. (ISSN 03778312) Timemarching prediction of unsteady condensation phenomena due to supercritical heat addition, In Turbomachinery : Latest Developments in a Changing Scene, London, IMechE, 1991, p. 167177. (ISBN 0852987617) 

CFD of Moving Shock Waves  Stationary
and moving normal shock waves in wet steam,
In Adiabatic Waves in LiquidVapour Systems, (ed. G.E.A. Meier and P.A. Thompson), Springer Verlag, 1990, p 159170. (ISBN 3540502033 Invited IUTAM Symposium.) 

CFD of Transonic SinglePhase Flow  Implicit
numerical simulation of transonic flow through turbine cascades on
unstructured grids, IMechE Proc., Part A, J. Power and Energy, vol 219, no A1, 2005, p. 3547. (13 pages) 

Interphase Transport of Mass, Momentum and Energy Relaxation Processes & Structure of Shock Waves 
A
unified theory of aerodynamic and condensation shock waves in
vapourdroplet flows with or without a carrier gas,
Physics of Fluids, vol 6, no 5, 1994, p 18931913. (21 pages) Normal shock wave structure in twophase vapourdroplet flows, Journal of Fluid Mechanics, vol. 228, 1991, p 243274. (32 pages) The physics of relaxation processes and of stationary and nonstationary shock waves in vapourdroplet flows, In Transport Phenomena in Heat and Mass Transfer (ed. J.A. Reizes), Elsevier, 1992, p 14041417. (ISBN 0444898514) Stationary and moving normal shock waves in wet steam, In Adiabatic Waves in LiquidVapour Systems, (ed. G.E.A. Meier and P.A. Thompson), Springer Verlag, 1990, p 159170. (ISBN 3540502033 Invited IUTAM Symposium.) Structure of partly dispersed normal shock waves in vapourdroplet flows, Physics of Fluids A, vol 4, no 7, 1992, p 15661578. (13 pages) Shock waves in fluids with interphase transport of mass, momentum and energy (vapourdroplet mixtures and solidparticleladen gases), In Shock Waves Science and Technology Reference Library, Volume 1: Multiphase Flows, (Edited by MEH van Dongen), Springer, 

Rankine Hugoniot Relations  Jump
conditions across normal shock waves in pure vapourdroplet flows,
Journal of Fluid Mechanics, vol 241,1992, p 349369. (21 pages) A unified theory of aerodynamic and condensation shock waves in vapourdroplet flows with or without a carrier gas, Physics of Fluids, vol 6, no 5, 1994, p 18931913. (21 pages) 

Total
Pressure and Temperature in Twophase Flows 
A
unified theory for the interpretation of total pressure and temperature
in twophase flows at subsonic and supersonic speeds,
Proceedings of the Royal Society, vol. 454, 1998, p. 671695. (25 pages) A simple, analytical theory for interpreting measured total pressure in multiphase flows, ASME J. Fluids Engg., vol. 120, June 1998, p 385389. 

Thermal Choking  Thermal
choking due to nonequilibrium condensation,
ASME Journal of Fluids Engineering, vol. 116, 1994, p 599604. 

Bioinspired Heat Exchangers  Overview
of the Development of Heat Exchangers for Use in AirBreathing
Propulsion PreCoolers, Acta Astronautica, vol. 41, no. 11, 1997, p. 723729 

Solar Energy  The
effect of bottom reflectivity on the performance of a solar pond,
Solar Energy, vol. 39, no. 4, 1987, p 361367. Concentration profile in the gradient zone of small solar ponds, Solar Energy, vol. 38, no. 2, 1987, p 135136. 
INTERNATIONAL PUBLICATIONS of A. Guha (Academic Journals, Edited Books, Refereed Conference, Invited Lectures) ACADEMIC JOURNALS
Quick Access to a few Reprints for personal reading only. Please CITE the articles if you benefit by reading them.
This Page is maintained by A. Guha . 