粒子网格混合方法模拟液滴夹带起始点

Numerical simulation of the onset of droplet entrainment in annular flow by particle-grid hybrid method

摘要:

环状流动的特性对反应堆事故工况分析具有重要意义,本研究基于粒子网格混合方法对这一现象中的液滴夹带起始点问题进行了数值分析,利用网格求解流场,利用粒子模拟液膜及液滴的运动,探讨了气水流动大密度比情况下,不同流动方向,不同流体粘度,不同液膜厚度下的液滴夹带所需的临界气相流速,结果同经典关系式进行了对比,吻合良好．这一方法对于反应堆事故中的两相流动研究具有参考意义．

Abstract:

In this paper the particle-grid hybrid numerical method is used to investigate the onset of droplet entrainment in annular flow. The flow field is solved on the grid and the motion of fluid film and droplet is solved by particles. Under large density ratio between gas and liquid the critical velocities of droplet entrainment for different flow directions, viscosities and fluid film thicknesses were obtained. The results are in good agreement with classical correlation. This method provides valuable references and guidelines for further study of the two-phase flow in nuclear reactor accident.