Vapor Bubble Nucleation and Growth in a Decreasing Pressure Field

快速减压系统中液体介质中蒸汽/气体体积分数的预测是许多技术应用中出现的一个问题。该解决方案需要知道闪烁混合物的单位体积气泡的数量，以及单个气泡的体积，作为时间的函数。在垂直激波管中进行精心控制的减压实验，其中平均空隙率将作为时间和压力的函数进行测量，使用除氧蒸馏水，有无不锈钢表面的存在。核分布函数由这些数据通过积分方程的数值反演或近似地通过反变换程序确定。这项实验工作提供了气泡核在典型工程表面上有效分布的信息。

The prediction of vapor/gas volume fraction in a liquid media in a rapidly depressuring system is a problem which arises in numerous technical applications. The solution requires knowledge of the number of bubbles per unit volume of the flashing mixture, as well as the volumes of the individual bubbles, as a function of time. Carefully-controlled depressurization experiments are performed in a vertical shock tube, in which mean void fraction will be measured as a function of time and pressure, with and without the presence of stainless-steel surfaces using deaerated distilled water. The nucleus distribution function is determined from these data by a numerical inversion of the integral equation, or approximately by an inverse transform procedure. This experimental work gives information on the effective distribution of bubble nucleii on typical engineering surfaces.