Relation between Condensation and Thermal Choking in an Unsteady Subsonic Flow

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When wet air or steam expands rapidly, condensation occurs at a supersaturated state rather than at its equilibrium saturated state. Many studies were reported in regard to this phenomenon so far. Unfortunately, however, most of these investigations were done on supersonic flows, and in the case of a subsonic flow there are many questions which are not yet resolved, especially about the effects of condensation on the flow-field. In the present study the condensation phenomena of water vapor have been experimentally investigated for an unsteady subsonic flow induced in a driver section of a shock tube. As the result, the relation between condensation and thermal choking of flow due to heat release of the latent heat of water vapor has been clarified. When the flow is choked thermally, a shock wave is generated and propagates upstream. Assuming a simple flow model, the Mach number of the propagating shock wave has been calculated. At the end of the present paper, the thermally choked flow due to condensation has been discussed from a viewpoint of analogy with a detonation wave.
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