Combustion

Chair

Professorship

Ray, Subhashis

Secretariat

Finance Administration

Scientific Assistants

Technical Assistants - Institute Workshop

Education

Research

Equipment

Prof. Dr. Subhashis Ray

Adresse:

TU Bergakademie Freiberg
Institute of Thermal Engineering
Chair of Gas and Heat Technology
Gustav-Zeuner-Str. 7
D-09599 Freiberg

Zimmer: 208

Telephone: +49 (0) 3731/ 39 3947
Fax: +49 (0) 3731/ 39 3942
E-Mail:

Year	Academic Education/ Awards
1995 – 1999	Ph.D., Indian Institute of Technology, Bombay
1987 – 1989	Master of Engineering, Indian Institute of Science, Bangalore
1983 – 1987	Bachelor in Mechanical Engineering, Jadavpur University

Year	Career
seit 07/2007	Scientific assistant at the Chair of Gas and Heat Technology at the TU Bergakademie Freiberg, Germany
02/2003 – 06/2004 05/2006 – 07/2006	Alexander von Humboldt scholarship at the Institut of Fluid Mechanics, Erlangen, Germany
05/1999 – 07/2007	Reader, Department of Mechanical Engineering, Jadavpur University, Kolkata, India
01/1996 – 04/1999	Senior Lecturer, Department of Mechanical Engineering, Jadavpur University, Kolkata, India
01/1990 – 12/1995	Lecturer, Department of Mechanical Engineering, Jadavpur University, Kolkata, India

Fields of Research
Thermal and Fluids Engineering, Special Interests: Computational Fluid Dynamics (CFD), Analytical methods, Turbulence Modelling, Pulsating Flows, Heat Transfer Enhancement, Second Law Based Optimisation through entropy generation minimisation, electro-magneto-hydrodynamics, Flows Through Porous Media, Combustion Modelling

Publications in 2012

Authors	Journals and Book Contributions
S. Voss, M. A. A. Mendes, J. M. C. Pereira, S. Ray, J. C. F. Pereira, D. Trimis	Investigation on the thermal flame thickness for lean premixed combustion of low calorific H2/CO mixtures within porous inert media, Proceedings of the Combustion Institute, 2012 (Article in Press)
M.A.A. Mendes, S. Ray, J.M.C. Pereira, J.C.F. Pereira, D. Trimis	Quantification of uncertainty propagation due to input parameters for simple heat transfer problems, International Journal of thermal Sciences 60 (2012), pp. 94-105
S. Ray, A. Loukou, D. Trimis	Evaluation of heat conduction through truncated conical shells, International Journal of thermal Sciences 57 (2012), pp. 183-191
R. Zehmisch, A. Al-Zoubi, S. Ray, D. Trimis, F. Ballani and K.G. van den Boogaart	Numerical Study of the Effective Thermal Conductivity of Refractory Materials, Refractories WORLDFORUM, Vol. 4, pp. 181 – 186, 2012.
S. Ray, B. Uensal and F. Durst	Development Length of Sinusoidally Pulsating Laminar Pipe Flows in Moderate and High Reynolds Number Regime, International Journal of Heat and Fluid Flow, Vol. 37, pp.167 – 176, 2012.
J. Chakraborty, S. Ray and S. Chakraborty	Role of Streaming Potential on Pulsating Mass Flow Rate Control in Combined Electroosmotic and Pressure Driven Microfluidic Devices, Electrophoresis, Vol. 33(3), pp. 419 – 425, 2012.

Authors	Contribution to Conferences, Symposia
S. Voss, M. A. A. Mendes, J. M. C. Pereira, S. Ray, J. C. F. Pereira, D. Trimis	Investigation on the thermal flame thickness for lean premixed combustion of low calorific H2/CO mixtures within porous inert media, 34th International Symposium on Combustion, Warsaw, Poland, July/August 2012
E. Werzner, S. Ray, D. Trimis,	Towards Development of a Transfer Function between Flow Rate and Pressure Gradient for Turbulent Pulsating Pipe Flow, Proceedings of the Seventh International Symposium On Turbulence, Heat and Mass Transfer. Palermo, Italy, 24.-27.09.2012
S. Ray, E. Werzner, D. Trimis	Numerical Solution of Mass Flow Rate Controlled, Fully Developed, Unsteady, Turbulent Pipe Flows, Proceedings of the Seventh International Symposium On Turbulence, Heat and Mass Transfer. Palermo, Italy, 24.-27.09.2012
R. Eder, V. Uhlig, D. Trimis, S. Ray, T. Wittenschläger	Entwicklungen zur Steigerung des Wärmeübergangs an keramischen Rekuperatoren, Ölwärmekolloquium, Aachen, Germany, September 2012
V. Skibina, M.A.A. Mendes, S. Ray, R. Wulf, A. Al-Zoubi, D. Trimis and U. Gross	Measurement and Numerical Evaluation of Effective Thermal Conductivity of FeCrAl-alloy Open Cell Metal Foams, Cellular Materials – CELLMAT 2012, Dresden, Germany, November, 07 – 09, 2012.
B. Uensal, S. Ray	A Technique To Measure Instantaneous Mass Flow Rate for Time-Periodic Laminar Pipe Flows and Its Verification with a Unique Mass Flow Rate Control Device, 8th International Symposium on Fluid Flow Measurement, Colorado, USA, June 20 – 22, 2012.

Publications in 2011

Authors	Journals and Book Contributions
E. Werzner, S. Ray, D. Trimis	Proposed Method for Measurement of Flow Rate in Turbulent Periodic Pipe Flow, Journal of Physics, Conference Series, Vol. 318, pp. 022044-1 – 022044-9
S. Chakraborty, and S. Ray	Performance Optimization of Laminar Fully Developed Flow Through Square Ducts with Rounded Corners, International Journal of Thermal Sciences, Vol. 50, pp. 2522 – 2535

Authors	Contribution to Conferences, Symposia
R. Eder, H. Isleker, S. Ray, D. Trimis	Neue keramische Wärmeübertrager für rekuperative und regenerative Industriegasbrenner durch textile Urformverfahren, Jahrestreffen der ProcessNet-Fachausschüsse „Gasreinigung” und „Hochtemperaturtechnik”, February 2011, Frankfurt, Germany.
A. Al-Zoubi, R. Zehmisch, S. Ray, F. Ballani, D. Trimis	Numerical Determination of Effective Thermal Conductivity of Refractory Materials Using Thermal Lattice Boltzmann Method, 17th international Prague conference on Refractories, 10.-11.05.2011
A. Banerjee, A. Mukhopadhyay and S. Ray	Solidification of a Pure Substance Around a Corner in a Square Enclosure, Proceedings of the 21st National & 10th ISHMT-ASME Heat and Mass Transfer Conference, Indian Institute of Technology, Madras, India, December 27 – 30.
E. Werzner, S. Ray, D. Trimis	Proposed Method for Measurement of Flow Rate in Turbulent Periodic Pipe Flow, ETC13 – 13th European Turbulence Conference, Warsaw, Poland, 12. – 15. September 2011

Publications in 2010

Authors	Journals and Book Contributions
S. Ray, D. Misra	Laminar Fully Developed Flow Through Square and Equilateral Triangular Ducts With Rounded Corners Subjected to H1 and H2 Boundary Conditions, International Journal of Thermal Sciences, 49 (2010) 1763–1775

Authors	Contribution to Conferences, Symposia
M.A.A. Mendes, S. Ray, D. Trimis	Uncertainty Quantification in Temperature Distribution for Annular Fins, 20th National Heat and Mass Transfer Conference & 9th International ASME-ISHMT Heat and Mass Transfer Conference, Indian Institute of Technology, Bombay, January 2010
S. Ray, A. Loukou, D. Trimis	Conduction Heat Transfer in a Truncated Conical Shell, 20th National Heat and Mass Transfer Conference & 9th International ASME-ISHMT Heat and Mass Transfer Conference, Indian Institute of Technology, Bombay, January 2010
T. Shaw, S. Ray, P.K. De	Simulation of Natural Convection from an Eccentric Horizontal Circular Cylinder in an Enclosure, 20th National Heat and Mass Transfer Conference & 9th International ASME-ISHMT Heat and Mass Transfer Conference, Indian Institute of Technology, Bombay, January 2010.
B. Stelzner, A. Al-Zoubi, A. Al-Sha’arawi, S. Ray and D. Trimis	Development of ethanol-fuel/off-gas porous hybrid-burner, HiTACG - 8th International Symposium on High Temperature Air Combustion and Gasification 2010, Poznan, Poland, July 2010
A. Al-Zoubi, S. Ray, D. Trimis	Dropwise Condensation In The Presence Of Non-Condensable Gas: Modelling and Parametric Study, 8th Euromech. Fluid Mechanics Conference, Bad Reichenhall, Germany, September 2010
H. Isleker, S. Ray, A. Al-Zoubi, D. Trimis	Heat Transfer Augmentation In Parallel Plate Channel Using Staggered Arrays of Wire-Loop Structures, 8th Euromech. Fluid Mechanics Conference, Bad Reichenhall, Germany, September 2010
H. Isleker, S. Ray, A. Al-Zoubi, D. Trimis	Laminar Natural Convection Heat Transfer From an Elliptic Cylinder in a Vertical Channel, 8th Euromech. Fluid Mechanics Conference, Bad Reichenhall, Germany, September 2010
T. Wittenschlaeger, S. Ray, A. Al-Zoubi, D. Trimis	Low Reynolds Number Simultaneously Developing Flow Through Pipes, 8th Euromech. Fluid Mechanics Conference, Bad Reichenhall, Germany, September 2010
E. Werzner, S. Ray, D. Trimis	Turbulent Pulsating Flow Through Circular Ducts, 8th Euromech. Fluid Mechanics Conference, Bad Reichenhall, Germany, September 2010
S. Ray, H. Isleker, A. Al-Zoubi, D. Trimis	Laminar Natural Convection Heat Transfer From a Heated Cylinder in a Vertical Channel, 37th National and 4th International Conference on Fluid Mechanics and Fluid Power, Indian Institute of Technology Madras, Chennai, December 2010
S. Ray, E. Werzner, D. Trimis	Pulsating Turbulent Flow Through Circular Ducts, 37th National and 4th International Conference on Fluid Mechanics and Fluid Power, Indian Institute of Technology Madras, Chennai, December 2010

Publications in 2009

Authors	Contribution to Conferences, Symposia
S. Ray, B. Schulz, A. Al-Zoubi, S. Voss, D. Trimis	COMBINED NUMERICAL AND EXPERIMENTAL STUDY ON HEAT EXCHANGERS WITH DIMPLED CHANNELS, International Conference on Energy Engineering 2009, India, January 2009
B. Stelzner, A. Al-Zoubi, A. Al-Sha’arawi, C. Löbel, S. Ray, D. Trimis	Development of Ethanol-fuel porous Burner for Application in a HT-PEM-Fuel cell system, 10th Conference on Energy for a Clean Environment, Lisboa, Portugal, July 2009

Publications in 2007

Authors	Journals and Book Contributions
F. Durst, B. Uensal, S. Ray and D. Trimis	Method for Defined Mass Flow Rate Variations in Time and its Application to Test a Mass Flow Rate Meter for Pulsating Flows, Measurement Science and Technology, Vol. 18, pp. 790 – 802.
S. Jana, S. Ray and F. Durst	A Numerical Method for Fluid Flow and Heat Transfer for Solving Solidification and Melting Problems, Applied Mathematical Modelling, Vol. 31, pp. 93 – 119.

Authors	Contribution to Conferences, Symposia
O. Ertunc, C. Koksoy, S. Ray and F. Durst	Rapid Axisymmetric Contraction of Grid-generated Turbulence and the Reynolds Stress Models at Rapid Distortion Limit, Submitted to 5^th International Symposium on Turbulence and Shear Flow Phenomenon, TU-Munchen, 27 – 29 August.

Publications in 2006

Authors	Journals and Book Contributions
H. Chattopadhyay, F. Durst and S. Ray	Analysis of Heat Transfer in Simultaneously Developing Pulsating Laminar Flow in a Pipe with Constant Wall Temperature, International Communications in Heat and Mass Transfer, Vol. 33, pp. 475 – 481.
V. Kumar, S. Ray and F. Durst	Modeling Moving Boundary Problems of Solidification and Melting Adopting an Arbitrary Lagrangian-Eulerian Approach for a 3D Block-Structured Finite Volume Solver, Numerical Heat Transfer Part-B, Vol. 49, pp. 299 – 331.

Authors	Contribution to Conferences, Symposia
A. Banerjee, S. Ray and A. Mukhopadhyay	Visualization of Energy Transport During Phase Change Using Generalised Heatline Formulation, Proc. NCFMFP2006, 33^rd National and 3^rd International Conference on Fluid Mechanics and Fluid Power, December 7 – 9.
S. Ray, F. Durst, B Uensal and M. Nishi	Analytical Determination of Flow Reversal in Laminar Fully Developed Mass Flow Driven Sinusoidally Pulsating Pipe and Channel Flows, Proc. NCFMFP2006, 33^rd National and 3^rd International Conference on Fluid Mechanics and Fluid Power, December 7 – 9.
B. Ray, I. Chakraborty, A. Mukhopadhyay, S. Ray and S. Sen	Response of Laminar Premixed Flames to Mass Flow Rate and Pressure Fluctuations, Proc. IMECE2006, 2006 ASME International Mechanical Engineering Congress and Exposition, November 5 – 10.
S. Chakraborti, S. Ray and A.Sarkar	Effect of Fence on the Performance of Sudden Expansion as Diffuser at Low Reynolds Number Regime, Proc. of ETIME – 2006, National Conference on Emerging Trends in Mechanical Engineering, February 10 – 11, pp. 1 – 9.
H. Chattopadhyay, S. Ray and F. Durst	Heat Transfer in Simultaneously Developing Pulsating Pipe Flows, Accepted for Presentation at 7^th ASME-ISHMT Heat and Mass Transfer Conference and 18^th National Heat and Mass Transfer Conference, to be held at Indian Institute of Technology, Guwahati, January 4 – 6, 2006.

Publications in 2005

Authors	Journals and Book Contributions
F. Durst, S. Ray, B. Uensal and O.A. Bayoumi	The Development Lengths of Laminar Pipe and Channel Flows, ASME, Journal of Fluids Engineering, Vol. 127, pp. 1154 – 1160.
B. Uensal, S. Ray and F. Durst	Pulsating Laminar Pipe Flows with Sinusoidal Mass Flux Variations, Fluid Dynamics Research, Vol. 37, pp.317 – 333.
S. Ray, B. Uensal, F. Durst, O. Ertunc, and O.A. Bayoumi	Mass flow rate controlled fully developed laminar pulsating pipe flows, Submitted to ASME, Journal of Fluids Engineering, Vol. 127, May, pp.405 – 418.

Authors	Contribution to Conferences, Symposia
M. Breuer, S. Ray, V. Kumar, J. Jovanovic, and F. Durst	Anisotropy Invariant Reynolds Stress Model and Its Application to Fully Developed Channel Flows, 76^th Annual GAMM Meeting, Universite du Luxembourg, Luxembourg, Proceedings in Applied Mathematics and Mechanics, WILEY–VCH Verlag GmbH & Co. KGaA, Weinheim, March 28 - April 1.

Publications in 2004

Authors	Journals and Book Contributions
S. Ray and F. Durst	Semi-Analytical Solutions of Laminar Fully Developed Pulsating Flows Through Ducts of Arbitrary Cross-Sections, Physics of Fluids, Vol. 16, No.12, pp. 4371 – 4385.

Authors	Contribution to Conferences, Symposia
S. Chakraborti, S. Ray and A. Sarkar	Study on the Performance of Sudden Expansion as a Diffuser in Low Reynolds number, Proceedings of 31^st National Conference on Fluid Mechanics and Fluid Power, December 16 – 18, Jadavpur University, Kolkata, pp.286 – 295.
F. Durst, B. Uensal, K. Beronov and S. Ray	What Do We Reliably Know About Pipe and Channel Flows, Keynote Lecture Presented by Prof. F. Durst at 31^st National Conference on Fluid Mechanics and Fluid Power, December 16 – 18, Jadavpur University, Kolkata.

Publications in 2003

Authors	Journals and Book Contributions
S. Chakraborti, S. Ray and A. Sarkar	Low Reynolds Number Flow Through Sudden Expansion – From a Diffuser Viewpoint, Journal of Energy, Heat and Mass Transfer, Vol. 25, pp.45 – 66.
S. Ray and A.W. Date	Friction and Heat Transfer Characteristics of Flow Through Square Duct with Twisted Tape Insert, International Journal of Heat and Mass Transfer, Vol. 46, pp.889 – 902.

Authors	Contribution to Conferences, Symposia
O. Ertunc, B. Uensal, S. Ray and F. Durst	Application of a mass flow controller to time-dependent laminar and transitional pipe flows, Proceedings of Eurotherm Seminar 74, pp.165-176.

Publications in 2002

Authors	Journals and Book Contributions
S. Chakraborti, S. Ray and A. Sarkar	Numerical Simulation of the Performance of a Vortex Controlled Diffuser in Low Reynolds Number Regime, International Journal of Numerical Method for Heat and Fluid Flow, Vol. 12, No.3, pp.224 – 240.

Authors	Contribution to Conferences, Symposia
A.K. Santra, D. Misra and S. Ray	Analysis of Laminar Natural Convection from a Discrete Isothermal Protruded Heater Mounted on the Side Wall of a Partially Open Rectangular Enclosure, Proceedings of 5^th ASME-ISHMT Heat and Mass Transfer Conference and 16^th National Heat and Mass Transfer Conference, Science City, Kolkata, pp. 466 – 471.
S. Ray, D. Misra and G. Laha	Pressure Drop and Heat Transfer Characteristics of Laminar Flow Through Ducts of Square and Triangular Cross Sections with Rounded Corners, Proceedings of 5^th ASME-ISHMT Heat and Mass Transfer Conference and 16^th National Heat and Mass Transfer Conference, Science City, Kolkata, pp. 341 – 346.
J. Rajeev, S. Ray and S. Sen	Conjugate Laminar Fully Developed Forced Convection Through Internally Finned Tubes – A Numerical Study, Proceedings of 5^th ASME-ISHMT Heat and Mass Transfer Conference and 16^{th<7sup> National Heat and Mass Transfer Conference, Science City, Kolkata, pp. 295 – 300.}

Publications in 2001

Authors	Journals and Book Contributions
S. Chakraborti, S. Ray and A. Sarkar	Numerical Simulation of the Performance of a Vortex Controlled Diffuser in Low Reynolds Number Regime, International Journal of Numerical Method for Heat and Fluid Flow, Vol. 12, No.3, pp.224 – 240.

Publications in 2000

Authors	Journals and Book Contributions
S. Ray and A.W. Date	A Calculation Procedure for Solution of Incompressible Navier-Stokes Equations on Curvilinear Non-Staggered Grids, Numerical Heat Transfer, Part – B, Vol.38, pp. 93 – 131.

Publications in 1998

Authors	Journals and Book Contributions
A. Mukhopadhyay and S. Ray	Conjugate Laminar Natural Convection in an Enclosure: Adiabatic and Perfectly Conducting Limits, Journal of Energy, Heat and Mass Transfer, Vol.20, pp. 117 – 125.

Authors	Contribution to Conferences, Symposia
S. Ray and A.W. Date	Relative Thermo-hydraulic Performance of Ducts of Square and Circular Cross Sections with Twisted Tape Inserts, Proceedings of 11^th International Heat Transfer Conference, Kyongju, Korea, Vol.6, pp. 315 – 320.

Publications in 1997

Authors	Contribution to Conferences, Symposia
S. Ray and A.W. Date	Numerical Prediction of Laminar and Turbulent Flow Through 90-Degree Bend Ducts of Square and Circular Cross Sections Using Non-Staggered Non-Orthogonal Grids, Proceedings of 3^rd ASME-ISHMT Heat and Mass Transfer Conference and 14^th National Heat and Mass Transfer Conference, I.I.T., Kanpur, pp. 673 – 678.

Publications in 1996

Authors	Journals and Book Contributions
A.K. Santra, S. Ray and D. Misra	Analysis of Laminar Natural Convection from a Discrete Isothermal Flushed Heater Mounted on the Side Wall of a Partially Open Rectangular Enclosure, Numerical Heat Transfer, Part – A, Vol.29, pp. 211 – 225.

Authors	Contribution to Conferences, Symposia
S. Ray and A.W. Date	Numerical Prediction of Laminar Flow and Heat Transfer in a Square Tube with Twisted Tape Insert, in Process, Enhanced and Multiphase Heat Transfer, Symposium Conducted by A.S.M.E., pp. 251 – 256.

Publications in 1995

Authors	Contribution to Conferences, Symposia
S. Ray	Laminar Fully Developed Forced Convection Cooling of Shrouded Arrays of Heated Rectangular Protrusions, Proceedings of 2^nd. ASME-ISHMT Heat and Mass Transfer Conference and 13^th National Heat and Mass Transfer Conference, REC., Suratkal, pp. 471 – 476.

Publications in 1994

Authors	Contribution to Conferences, Symposia
A. Mukhopadhyay and S. Ray	Limiting Cases of Conjugate Laminar Natural Convection In a Differentially Heated Square Cavity, Proceedings of 1^st. ASME-ISHMT Heat and Mass Transfer Conference and 12^th National Heat and Mass Transfer Conference, BARC, Bombay, pp. 319 – 324.

Publications in 1993

Authors	Contribution to Conferences, Symposia
S. Mitra and S. Ray	Natural Convection Through Vertical Channel with Isolated Horizontal Heated Strips on One Wall, Proceedings of 6^th International Symposium on Transport Phenomena in Thermal Engineering, Seoul, South Korea, pp. 123 – 128, 1993.

Publications in 1992

Authors	Journals and Book Contributions
S. Ray and J. Srinivasan	Analysis of Conjugate Laminar Mixed Convection in Shrouded Arrays of Electronic Components, International Journal of Heat and Mass Transfer, Vol.35, pp. 815 – 822.

Publications in 1991

Authors	Contribution to Conferences, Symposia
S. Sen and S. Ray	Effect of Initial Temperature of Fluid on Thermally Fully Developed Flow, Proceedings of 11^th National Heat and Mass Transfer Conference, I.I.T., Madras, pp. 353 – 358.

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