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| Thermodynamics effect on cavitation for high temperature water |
| Wang Wei, Lin Yin, Wang Xiaofang, Wang Yiming |
| School of Energy and Power Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China |
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Abstract In order to study the temperature difference in cavitation field for water at room temperature and high temperature and to reveal thermodynamic effect on cavitation, the cavitation field on NACA0066(MOD)airfoil surface was simulated with CFD software based on mass transport equation and full cavitation model. Source term that depicts the thermodynamic effect was added in energy equation by importing UDF code and the saturated vapor pressure was set as a function of temperature. The results show that temperature altered in cavitation field because of absorption of latent heat when cavita-ting, and cavity zone temperature is respectively 0.13, 0.84, 13.00 K lower than that of upper steam, which is respectively at 293, 373, 473 K. In other words, the higher the temperature of the fluid, the greater temperature drop is in cavity zone. Moreover, with decrease of saturated pressure caused by the decrease of local temperature, the length of cavity is shortened.
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Received: 10 December 2013
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