Relation between condensation and thermal choking in an unsteady subsonic flow
Abstract
The homogeneous condensation of water vapor is experimentally investigated in an unsteady subsonic flow induced by the expansion fan in a shock tube, and the relation between condensation and thermal choking of flow due to heat release of the latent heat of water vapor is clarified. It is found that when condensation occurs in a flow which is thermally choked, a shock wave is generated and propagates upstream. An experimental relation between the propagating Mach number of the shock wave and the initial relative humidity of wet air is presented. The Mach number increases with an increased amount of heat release and an increased moving speed of the condensation zone. If the amount of heat release is constant, the shock Mach number increases with an increasing Mach number of the initial flow. If the heating zone moves relative to the flow, the flow Mach number downstream of the zone is unity.
 Publication:

JSME International Journal Series B
 Pub Date:
 May 1982
 Bibcode:
 1982JSMEB..25..744M
 Keywords:

 Chokes (Restrictions);
 Shock Tubes;
 Shock Wave Propagation;
 Subsonic Flow;
 Unsteady Flow;
 Water Vapor;
 Detonation Waves;
 Flow Distribution;
 Latent Heat;
 Liquefaction;
 Mach Number;
 Mathematical Models;
 Pressure Measurement;
 Propagation Velocity;
 Temperature Effects;
 Wave Propagation;
 Fluid Mechanics and Heat Transfer