A method to model latent heat for transient analysis using NASTRAN
Abstract
A sample heat transfer analysis is demonstrated which includes the heat of fusion. The method can be used to analyze a system with nonconstant specific heat. The enthalpy is introduced as an independent degree of freedom at each node. The user input consists of a curve of temperature as a function of enthalpy, which may include a constant temperature phase change. The basic NASTRAN heat transfer capability is used to model the effects of latent heat with existing direct matrix output and nonlinear load data cards. Although some user care is required, the numerical stability of the integration is quite good when the given recommendations are followed. The theoretical equations used and the NASTRAN techniques are shown.
 Publication:

Computational Aspects of Heat Transfer in Structures
 Pub Date:
 1982
 Bibcode:
 1982caht.nasa...83H
 Keywords:

 Heat Of Fusion;
 Heat Transfer;
 Latent Heat;
 Mathematical Models;
 Nastran;
 Transient Heating;
 Enthalpy;
 Finite Element Method;
 Numerical Integration;
 Numerical Stability;
 Phase Transformations;
 Simultaneous Equations;
 Temperature Distribution;
 Fluid Mechanics and Heat Transfer