Title of Paper:NONEQUILIBRIUM CONDENSATION AND THERMALLY CHOKED FLOW IN A SHOCK TUBE

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Date of Publication:2013-01-01

Journal:HEAT TRANSFER RESEARCH

Included Journals:SCIE、EI、Scopus

Volume:44

Issue:8

Page Number:745-760

ISSN No.:1064-2285

Key Words:nonequilibrium; condensation; unsteady state; shock tube; thermal choking

Abstract:An explicit equation for the addition of critical heat to 1D compressible unsteady condensation flows inside a shock tube has been derived. The equation is of general validity and can be applied to vapor flow with or without a carrier gas. The results obtained show that the critical quantity of heat in an internal heat flow was larger due to phase transition than the external heat flow. When the flow is thermally choked, a shock wave is generated and propagates upstream. The reason for the onset of condensation is explained. It is inconsistent with the location of local static pressure which begins to rise in a shock tube with unsteady condensation flow. In addition, two types of condensation flow in a shock tube are simulated: the subcritical heat flow and the supercritical heat flow. Quantitative validation of the numerical model was made. The results showed good agreement between the values of numerical simulation and theoretical analysis.