A Study of Moist Air Condensation Characteristics in a Transonic Flow System

When water vapor in moist air reaches supersaturation a transonic flow system, non-equilibrium condensation forms large number of droplets which may adversely affect the operation some thermal-hydraulic equipment. For better understanding this condensing phenomenon, numerical model is applied to analyze system by using theory nucleation and droplet growth. The Benson adopted correct liquid-plane surface tension equation for realistic results. results show that distributions pressure, temperature Mach are significantly different from those dry air. exaggerates 19% reduces both pressure 34% at nozzle exit as compared with model. At Laval nozzle, example, rate, rate increase increasing relative humidity. also reveal fact condensate increases rapidly when 60% These findings provide fundamental approach account effect formation on gas system.