2011-02-23
10:15 at HCI J 574

Corrections to the Navier-Stokes-Fourier model to account for non-local-equilibrium

Kokou Dadzie

Department of Mechanical Engineering, University of Strathclyde, UK

Most engineering flow problems are solved using the Navier-Stokes-Fourier continuum mechanical model. But this model fails to account properly for non-equilibrium flow and heat transfer effects in rarefied gases. Various attempts to improve the capability of the continuum model have been made, e.g. the application of velocity slip and temperature jump corrections at solid bounding surfaces. This talk will start with a brief survey of some of these methods to improve the Navier-Stokes-Fourier capabilities, and then discuss and present results based on an unconventional mass/volume-diffusion correction that has been hypothesized recently as a route to account for strong non-equilibrium gas flow effects. Sound wave propagation, shock wave structures, and flowrates in microchannels are among the theoretical results discussed and compared with experimental data.