水在流动油介质中雾化机理的数值模拟研究

基于一种制取流体冰的新方法,对水在流动的互不相溶的油介质中的雾化机理进行了三维数值模拟,求解连续性方程和动量守恒方程并考虑重力及表面张力的影响,对压力速度耦合采用PISO(Pressure Implicit Splitting Operators)算法,利用VOF(Volum e of Flu id)方法中的PLIC(P iecew ise L inear Interface Construction)技术追踪水与油介质之间的移动界面,模拟多种情况下的流动状况,分析了水在喷口处的流速、油的入口流速以及喷口直径对于雾化水滴大小的影响.模拟结果表明,雾化形成的水滴平均直径随水在喷口处的流速增加而增大,随油的入口流速的增加而减小;喷口直径越大,水滴的平均直径越大.

Investigation on Water Atomization in Oil Flow with Numerical Simulation Method

Based on a new method to produce fluid ice,water atomization in immiscible oil flow is simulated numerically in this paper.A set of three-dimensional transient conservation equations of mass and momentum are established by taking surface tension and gravitational force effects into consideration.The governing equations are solved by using Pressure Implicit Splitting Operators(PISO) algorithm.The volume-of-fluid(VOF) method in conjunction with the multi-dimensional piecewise linear interface construction(PLIC) is applied to characterize the behavior of water-oil interface movement.The flow phenomena in different working conditions are researched.The results of simulation show that the average atomization diameter of water droplets increases with the velocity of water and decreases with the velocity of oil,and it increases with the diameter of atomization pipe.