Accession Number:

ADA224865

Title:

Phase Change Material for Spacecraft Thermal Management

Descriptive Note:

Final rept. 1 Sep 1988-31 Mar 1989

Corporate Author:

MISSOURI UNIV-ROLLA DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s):

Report Date:

1990-04-01

Pagination or Media Count:

39.0

Abstract:

Processes related to phase change encompass a wide range of engineering and scientific disciplines and occur in many applications. Owing to the release or absorption of latent heat, these phase change problems are nonlinear, and exact solutions are limited to a small class of problems involving pure substances in one-dimensional infinite or semi-infinite domains. Based on an enthalpy formulation, several models have been studied for solving the phase change heat transfer problem of melting. In this report, a continuum model is presented and utilized in a finite-difference numerical method. Thermophysical properties of the PCM Phase Change Material such as mass density, specific heat, thermal conductivity, etc. change while the PCM undergoes the solid-liquid phase change. Accommodation methods for these variations have been developed and are presented. The mathematical and numerical formulations of the conservation of mass, momentum and energy equations and thermodynamic property equations are presented in detail. Limited preliminary results for P116 wax show velocity vector fields and the liquidus lines during melting. Keywords Phase change material, Thermal storage, Spacecraft thermal control.

Subject Categories:

  • Thermodynamics
  • Astronautics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE