CHE Seminars  


Speaker Dr. Amith agarwal
Department of Mechanical Engineering, IIT Bombay
Topic Search for Higher-Order Continuum Transport Equations
Date 12 ,September 2014 (Friday) 2014
Place L-17
Time 4.00 PM - 5.00 PM


There is evidence in the literature as well as experimental data from our lab suggesting that the Navier-Stokes-Fourier equations are inadequate to explain several observations with low-pressure gas flows. There seems to be no satisfactory alternative to theoretically describe the flow when the mean free path of the gas is of the order of the characteristic length scale. The two well established approaches of solving the Boltzmann equation yields the Burnett and Grad 13-moments equations. However, several shortcomings of these equations are known by now. This motivated us to explore alternate ways to derive higher-order continuum transport equations. In this talk, I will first present experimental results on rarefied gas flow in a sudden expansion. This flow exhibits several unique features not seen with conventional flows; such as discontinuity in pressure gradient at the junction, and absence of flow separation yet an enhanced overall pressure drop. We will also present the first analytical solution of the Burnett equations for any configuration. In the second part of this talk, we will discuss our ongoing effort of employing distribution function consistent with Onsager┐s reciprocity principle to capture non-equilibrium thermodynamics effects. Our approach yields 13-moments equations which are similar to the Grad┐s equations; but our corresponding equations are substantially different than the Burnett equations.


Dr. Amit Agrawal joined IIT Bombay in 2004 and is currently Professor in the Department of Mechanical Engineering. He obtained BTech from IIT Kanpur and PhD from the University of Delaware, USA. He has worked as Engineer in Tata Motors, Pune and as a Postdoctoral Fellow at the University of Newcastle, Australia. His research interests are in Micro-scale flows, Turbulent flows and Convective Heat Transfer. His work has appeared on the cover page of Journal of Fluid Mechanics and SPIE Journal of Micro/Nanolithography, MEMS, and MOEMS. He was recently awarded the Prof. K.N. Seetharamu Medal by the Indian Society of Heat and Mass Transfer.