Étude d’un fluide supercritique dans une cavité.

Abstract

The aim of this master’s thesis is to model and simulate flow and heat transfer in a supercritical fluid flowing into a laterally opened 2D cavity, in order to study how the specific properties of the fluids near of the liquid-gas critical point can modify the observed phenomena for perfectgases. The configuration chosen for the numerical simulations corresponds to the case of a bottom-heated Haguen-Poiseuille flow (Poiseuille-Rayleigh-Benard problem) which has been widely studied in the literature for perfect gases. The results show the existence of thermoconvective instabilities in the form of thermal plumes extending over the entire height of the cavity in the case of a perfect fluid and over the hot boundary layer in the case of a supercritical gas. Our study also shows that these thermoconvective