Kowalczyk, Wojciech; Hartmann, Christoph; Delgado, Antonio:

Modelling and numerical simulation of convection driven high pressure induced phase changes

In: International Journal of Heat and Mass Transfer, Jg. 47 (2004) ; Nr. 5, S. 1079-1089
ISSN: 0017-9310
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Ingenieurwissenschaften » Maschinenbau und Verfahrenstechnik
High pressure induced freezing and thawing processes are investigated by means of modelling and numerical simulation. The enthalpy–porosity model is reformulated in terms of conservation equations of mass, momentum and heat for a compressible medium. It can be shown that convective fluid motion has a major influence on the formation of the ice front. Furthermore, due to a vanishing density anomaly under high pressure, natural convection exhibits a different behaviour than under low pressure thus the formation of the ice front under high pressure obeys different mechanisms than that under ambient pressure.