DIRECT NUMERICAL MODELING OF HEAT AND MASS-TRANSPORT IN A NEAR SUPERCRITICAL-FLUID

The analytical solution of the low Mach number hyper compressible flow equations describing the propagation of a heat pulse in a near superc ritical Van der Waals gas is obtained. The numerical solution by the m eans of the PISO algorithm is performed and discussed. The evolution o f the thermodynamic parameters in space and time is given as a functio n of the distance of the initial conditions to the critical point. The results concerning the time of equilibration of the temperature pulse at the wall. fits the recent experimental findings.