The Numerical Simulation of Collapse Pressure and Boundary of the Cavity Cloud in Venturi  

作　　者：张晓冬 付勇 李志义 赵宗昌 

机构地区：[1]R&D Institute of Fluid and Powder Engineering, College of Chemical Engineering, Dalian University of Technology, Dalian 116012, China

出　　处：《Chinese Journal of Chemical Engineering》2009年第6期896-903,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （10472024）.

摘　　要：The idea that the collapse proceeds from the outer boundary of the cavity cloud towards its center for the ultrasonic cavitation proposed by Hasson and Morch in 1980s is further developed for calculating the collapse pressure and boundaries of cavity cloud at the collapse stage of bubbles for hydraulic cavitation flow in Venturi in present research. The numerical simulation is carried out based on Gilmore＇s eouations of bubble dynamics, which take account of the compressibility of fluid besides the viscosity and interfacial tension. The collapse of the cavity cloud is considered to proceed layer by layer from the outer cloud towards its inner part. The simulation results indicate that thepredicted boundaries of the cavity cloudat the collapse stage agree.well with the exPerimental ones.It is also found that the maximum collapse pressure of the cavity cloud is several times as high as the collapse pressure of outside boundary, and it is located at a point in the axis, where the cavity cloud disappears completely. This means that a cavity cloud has higher collapse pressure or strength than that of a single bubble due to the interactions of the bubbles. The effects of operation and structural parameters on the collapse pressure are also analyzed in detail.倒塌向它 Hasson 建议的超声的成穴的中心从洞云的外部边界继续，在 1980 年代的 Morch 是进一步的想法为在现在的研究在液体流动测量器为水力的成穴流动在水泡的倒塌阶段计算倒塌压力和洞云的边界发展了。数字模拟基于 Gilmore 水泡动力学的方程被执行，它除粘性和界面的紧张以外考虑液体的压缩的可能性。洞云的倒塌被认为继续由从向它的内部部分的外部云的层的层。模拟结果显示在倒塌阶段的洞云的预言的边界与试验性的同意很好。洞云的最大的倒塌压力几倍高于外面的边界的倒塌压力，这也被发现，并且它在一个点位于轴，在洞云完全消失的地方。这意味着洞云比一个单身者的让更高的倒塌压力或力量由于水泡的相互作用起泡。倒塌压力上的操作和结构的参数的效果也详细被分析。

关 键 词：cavity cloud collapsing layer by layer laydrodynamic cavitation collapse pressure bubble dynamics 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TP212[自动化与计算机技术—计算机科学与技术]