CONNECTION BETWEEN ZERO-PRESSURE MIXING RULES AND INFINITE-PRESSURE MIXING RULES

Infinite-pressure mixing rules and zero-pressure mixing rules are rela ted by a very simple equation. The zero-pressure models and the infini te-pressure models are interchangeable through this connection. This p aper will show how to convert the Huron-Vidal infinite-pressure mixing rule to a zero-pressure mixing rule, or vice versa. The MHV1 zero-pre ssure mixing rule will be reformulated to satisfy second virial coeffi cient constraint. The Twu-Coon and Wong-Sandler infinite-pressure mixi ng rules will be modified to improve their accuracy for reproducing th e incorporated G(E) model. A simplification of the Twu-Coon-Bluck [TCB (r)] zero-pressure mixing rule will be presented. The MHV1 mixing rule will be shown to be a special case of TCB(r). (C) 1998 Elsevier Scien ce B.V. All rights reserved.