Effect of cavitating flow on forced convective heat transfer: a modeling study  

作　　者：Jun Cai Xunfeng Li Bin Liu Xiulan Huai 

机构地区：[1]Institute of Engineering Thermophysics,Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2014年第14期1580-1590,共11页

基　　金：Acfinancially supported by the National Natural Science Foundation of China(51076151);the National Basic Research Program of China(2011CB710705)

摘　　要：With water as working medium,a numerical study on liquid convection heat transfer accompanied by cavitating flow in a circular tube was conducted by combining mixture model and Schnerr–Sauer cavitation mode in the commercial code,Ansys Fluent.Cavitation is instigated by setting a restriction orifice in the circular tube.The simulation results show that cavitation occurs around the wall of the restriction orifice and disappears at the downstream regions.The comparison of local heat transfer coefficients under the same mass flow rate indicates that,heat transfer is significantly augmented at the downstream regions of the restriction orifice because of the occurrence of cavitation.The analysis on the characteristics of cavitating and noncavitating flows confirms that the occurrence of cavitation can increase the turbulence intensity under the same mass flow rate,which is the origin for heat transfer to be enhanced.Based on it,the effects of such factors as inlet pressure and ratio of orifice to pipe diameter on cavitation enhanced heat transfer were further investigated for the purpose of application.With water as working medium, a numerical study on liquid convection heat transfer accompanied by cavitating flow in a circular tube was conducted by com- bining mixture model and Schnerr-Sauer cavitation mode in the commercial code, Ansys Fluent. Cavitation is insti- gated by setting a restriction orifice in the circular tube. The simulation results show that cavitation occurs around the wall of the restriction orifice and disappears at the downstream regions. The comparison of local heat transfer coefficients under the same mass flow rate indicates that, heat transfer is significantly augmented at the downstream regions of the restriction orifice because of the occurrence of cavitation. The analysis on the characteristics of cavi- tating and noncavitating flows confirms that the occurrence of cavitation can increase the turbulence intensity under the same mass flow rate, which is the origin for heat transfer to be enhanced. Based on it, the effects of such factors as inlet pressure and ratio of orifice to pipe diameter on cavitation enhanced heat transfer were further investigated for the purpose of application.

关 键 词：强迫对流换热 空化流 建模 FLUENT 节流孔板 局部传热系数 质量流率 ANSYS 

分 类 号：P401[天文地球—大气物理学与大气环境]