以水为介质,建立了液体流动的混合物多相流模型及空化模型,运用CFD方法对水平圆管内伴随有水力空化现象的受迫对流换热过程进行了数值研究,详细分析了管道入口压力、入口温度和限流孔与管道直径比等因素对水力空化及对流换热过程的影响规律。数值模拟结果表明,空化现象出现在圆管喉部（限流孔）壁面附近区域;与相同流量下无空化时的传热相比,在发生空化现象的区域,传热壁面被蒸汽所覆盖导致传热急剧恶化,而在远离空化发生区域的下游位置,由于空化的扰流作用使得加热壁面与流体之间的传热得到明显改善。
With water as a cavitation medium,both mixture multiphase flow model and cavitation model were established,and CFD method was used to simulate the forced convection heat transfer with hydrodynamic cavitation in a horizontal circular tube.The effects of such factors as inlet pressure,initial liquid temperature and ratio of orifice to pipe diameter on cavitation and heat transfer were discussed in detail.The results show that cavitation occurs near the wall of pipe throat where heat transfer is weakened because of a lower thermal conductivity of vapor.However,heat transfer is significantly enhanced at the downstream of circular tube due to the disturbance caused by cavitation.
参考文献
| [1] | 魏群,高孟理.水力空化及其研究进展[J].湖南城市学院学报（自然科学版）,2004(04):22-25. |
| [2] | 张晓冬,李志义,武君,刘学武,刘东学,夏远景.水力空化对化学反应的强化效应[J].化工学报,2005(02):262-265. |
| [3] | 陈利军,吴纯德,张捷鑫.水力空化技术在饮用水消毒中的应用[J].水处理技术,2007(03):45-48. |
| [4] | 沈银华,邓松圣,张攀锋.空化射流降解机理研究[J].贵州化工,2007(01):25-27. |
| [5] | Kelkar MA;Gogate PR;Pandit AB .Intensification of esterification of acids for synthesis of biodiesel using acoustic and hydrodynamic cavitation[J].Ultrasonics sonochemistry,2008(3):188-194. |
| [6] | Jyoti KK.;Pandit AB. .Hybrid cavitation methods for water disinfection: simultaneous use of chemicals with cavitation[J].Ultrasonics sonochemistry,2003(4/5):255-264. |
| [7] | Gogate PR .Application of cavitational reactors for water disinfection: current status and path forward[J].Journal of Environmental Management,2007(4):801-815. |
| [8] | Brandon Schneider;Ali Kosar;Chih-Jung Kuo;Chandan Mishra;Gregory S. Cole;Robert P. Scaringe;Yoav Peles .Cavitation Enhanced Heat Transfer in Microchannels[J].Journal of heat transfer: Transactions of the ASME,2006(12):1293-1301. |
| [9] | Jun Cai;Xiulan Huai;Runsheng Yan;Yanjun Cheng .Numerical simulation on enhancement of natural convection heat transfer by acoustic cavitation in a square enclosure[J].Applied Thermal Engineering,2009(10):1973-1982. |
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