Document Type

Article

Publication Date

2007

Publication Source

Journal of Applied Physics

Abstract

A numerical investigation study was performed to study the phase change behavior of wax/foam composite encapsulated in an aluminum casing. Two types of foam materials, namely, aluminum and carbon, were infiltrated with paraffin wax. The progress of melt interface and temperature distribution within the encapsulated composite was analyzed using computational fluid dynamics software (CFD). A two-energy equation model was implemented in the CFD software through the use of user-defined function (UDF). Interfacial effects influencing the heat transfer process at the casing-composite junction and between the wax-foam surfaces within the composite were addressed through the use of separate UDF. In addition, the effect of capillary pressure developed within the foam matrix was incorporated using an area ratio parameter.

The contact resistance at the foam-casing interface and the capillary pressure had a major influence on the thermal behavior of the system. These two factors lowered the heat transfer rate considerably, and the melting area was reduced by more than 30%. The temperature profiles for the foam material showed a different pattern as compared to the temperature within the wax, which was due to the effect of thermal nonequilibrium.

Inclusive pages

033506-1 to 033506-8

ISBN/ISSN

0021-8979

Document Version

Published Version

Comments

This article has been archived and provided for download in compliance with publisher policies on self-archiving. Permission documentation is on file.

Publisher

American Institute of Physics

Volume

102

Peer Reviewed

yes