AFDM: An Advanced FluidDynamics Model. Volume 4: The AFDM heat and masstransfer solution algorithm
Abstract
This report gives the Advanced FluidDynamics Model (AFDM) solution algorithm describing vaporization/condensation (V/C) and melting/freezing processes. The finitedifference equations used are derived from the general AFDM differential equations with convection ignored. In twophase 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 singlephase 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. Masstransferinduced 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;
 SinglePhase Flow;
 Two Phase Flow;
 Vaporizing;
 Heat Transfer;
 Mass Transfer;
 Fluid Mechanics and Heat Transfer