AFDM: An Advanced Fluid-Dynamics Model. Volume 4: The AFDM heat- and mass-transfer solution algorithm
Abstract
This report gives the Advanced Fluid-Dynamics Model (AFDM) solution algorithm describing vaporization/condensation (V/C) and melting/freezing processes. The finite-difference equations used are derived from the general AFDM differential equations with convection ignored. In two-phase cells, V/C is determined by a simultaneous iterative solution. The objective is to retain stability and energy conservation with consistent interfacial and bulk conditions describing vapor/liquid densities and temperatures. Particular attention is given in the special cases required to obtain a solution. In single-phase cells, the heat transfer is determined first; then, a vapor composition is updated for the (alpha)(sub 0) volume based on the saturation pressures for the individual liquids. Melting/freezing rates are determined based on equilibrium considerations. Mass-transfer-induced velocity changes are calculated implicitly so as to conserve momentum. In addition to the treatment of the standard models, a description is provided on the energy transfers used for the simplified NOPHASE option.
- Publication:
-
Unknown
- Pub Date:
- September 1990
- Bibcode:
- 1990afdm....4.....B
- Keywords:
-
- Algorithms;
- Computational Fluid Dynamics;
- Condensing;
- Finite Difference Theory;
- Fluid Flow;
- Freezing;
- Fusion (Melting);
- Iterative Solution;
- Mathematical Models;
- Single-Phase Flow;
- Two Phase Flow;
- Vaporizing;
- Heat Transfer;
- Mass Transfer;
- Fluid Mechanics and Heat Transfer