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Digital Computer Analysis of Condensation in Highly Expanded Flows

Report Number: ARL 63-206
Author: Griffin, James L.
Corporate Author: University of Michigan
Laboratory: Aerospace Research Laboratories
Date of Publication: 1963-11
Pages: 97
Contract: AF 33(657)-8867
Project: 7116
Task: 711601
AD Number: AD0428303

The application of the IBM 7090 digital computer to the theoretical prediction of condensation in highly expanded flows is presented. The equations of the spontaneous nucleation theory of Frenkel are combined with the steady one-dimensional diabatic flow equations for a solution of the expansion of a pure vapor. A digital computer program for the solution of these equations is compiled and presented. The theoretical prediction of the condensation of nitrogen is compared to experimental results and variations in specific heat, latent heat of vaporization, surface tension, and rate of expansion are investigated. The theoretical calculation is applied to metal vapors and the results for copper and zinc vapors are presented. The results indicate that the theoretical solution gives a reasonable prediction of the condensation in highly expanded flows. The degree of supersaturation increases with an increased rate of expansion and for a proper set of initial conditions, condensation-free flow is obtainable. The rate of expansion and the surface tension are the most critical parameters in the equations for condensing flow. Variations of specific heat and latent heat of vaporization show only minor effects on the end result.

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