P. K . Das's Talk

Jan 14, 2010 - 16:00

Jan 14, 2010 - 16:00

Room No 118 (Creativity Hall)

Seminars

Prof. P. K. Das Department of Mechanical Engineering Indian Institute of Technology Kharagpur

Abstract : Two algorithms for simulating multiphase flow will be discussed. Due to the complexity of multiphase flow and due to the existence of multiple scales it is a formidable task to develop a generic computational algorithm applicable for all the flow configurations. However multiphase flow can loosely be categorized as i) well dispersed flow and ii) flow with distinct interface. The algorithms are developed for these two typical hydrodynamic situations. Bubbly flow has been taken as the example of well dispersed or mixed flow. A combined two fluid population balance model has been used to simulate the flow. Efforts have been extended for the prediction of transition boundary based on unique transition criteria. Excellent agreement with experiment has been obtained for up and down flow through circular tubes and for up-flow through circular annulus. Lagrangian formulation based Smoothed Particle Hydrodynamics (SPH) has been adopted to simulate the spatio-temporal evolution of interfaces. For the first time the concept of diffuse interface(DI) has been introduced in SPH. The combined DI-SPH technique has been used to solve a number of problems of bubble and drop dynamics. 1. Das A.K. Das P.K. “Bubble evolution through submerged orifice using smoothed particle hydrodynamics: Basic formulation and model validation” Chemical Engineering Science Vol. 64 Issue 10 2009 pp. 2281-2290. 2. Das A.K. Das P.K. Thome J.R. “Transition of bubbly flow in vertical tubes: new criteria through CFD simulation” ASME Journal of Fluids Engineering Vol. 131 Issue 9 2009 pp. 091303-1-12. 3. Das A.K. Das P.K. “Bubble evolution through submerged orifice using smoothed particle hydrodynamics: effect of different thermo physical properties” Industrial Engineering and Chemistry Research Vol. 48 Issue 18 2009 pp. 8726-8735. 4. Das A.K. Das P.K. “Simulation of a sliding drop over an inclined surface using smoothed particle hydrodynamics” Langmuir Vol. 25 Issue 19 2009 pp. 11459-11466.About the speaker: Prof. P. K. Das belongs to the Thermo-fluids section of the Department of Mechanical Engineering Indian Institute of Technology Kharagpur. He works on diverse fields of thermal engineering. Some of his research topics are analysis and optimization of extended surfaces dynamic simulation of heat exchangers natural circulation loops rewetting of hot surfaces heat transfer in nano-fluids hydraulic jump etc. He has extensively worked on multiphase flow. In this field his research includes hydrodynamics of gas-liquid and liquid-liquid flow development of measurement techniques boiling and condensation etc. Recently he is developing some unique computational algorithms for multiphase flow. He has contributed severalbook chapters and around hundred papers in International journals. He has eight patents. He is also active in sponsored research. He has worked on different problems of Nuclear Thermo-hydraulics problems related to space and defense applications. Out of his many consultancy works the design of the air conditioning and ventilation system of the international terminal of Calcutta airport worth mentioning. He is a recipient of the EPSRC fellowship of the Government of UK K.N. Seetharamu award of Government of UK and a fellow of Indian National Academy of Engineering.