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论文类型：期刊论文

发表时间：2013-06-01

发表刊物：DESALINATION AND WATER TREATMENT

收录刊物：SCIE

卷号：51

期号：22-24

页面范围：4684-4693

ISSN号：1944-3994

关键字：Thermal vapor compressor; Supersonic jetting flow; Shock; CFD

摘要：The thermal vapor compressor (TVC) is an essential part that governs the overall process in the multiple-effect distillation--TVC system. The supersonic steam jetting flow always occurs in the TVC equipment, and the flow in the TVC is very complex due to the strong compressibility, non-equilibrium phase change, and supersonic turbulent flow of the stream. So, to improve the performance of an ejector system, an investigation of the characteristics for the high speed flow inside the ejector is often required. In the present study, the supersonic steam jetting flow with non-equilibrium phase change and condensation shock was numerically studied based on the computational fluid dynamics method. A conservative compressible numerical model coupling with non-isothermal classical nucleation model and droplet growth model, in which the thermodynamic state and properties of steam was calculated by the Virial Equations, was developed and used to predict the supersonic non-equilibrium jetting flow. The effects of various operating pressures on the nozzle performance were investigated. The research explored the effect of steam pressure, temperature, supercooling level, and super-saturation ratio on the onset of the nucleation and the intensity of condensation shock in the supersonic steam flow.