预测气液两相分层流界面剪切应力的新方法

A New Method for Predicting Interfacial Shear Stress of Stratified Gas-liquid Two-phase Flow

针对水平管气液两相分层流界面剪切应力的预测,建立了基于计算流体力学(CFD)方法的剪切滑移壁面模型,即将气液界面处理为固定的具有均匀剪切应力的水平滑移壁面。利用FLUENT软件模拟了气相流动,气液界面采用剪切滑移壁面边界条件,通过对比实验测量的气相流场分布得到气速和界面剪切收敛值,并由收敛值拟合得到界面摩擦因子与气相雷诺数的关联式。应用这一关联式的预测结果与实验间接测量值吻合较好,并且在气、液相雷诺数9 400≤ReG≤50 000和21 000≤Re_L≤30 000范围内优于Taitel和Dukler与Sidi-Ali和Gatignol模型。表明剪切滑移壁面模型可以有效地控制关键参数,提高预测效率和精度,为CFD方法预测气液两相分层流界面剪切应力提供了新的思路。

A new Slip-shear wall model based on computational fluid dynamics（CFD） for predicting the interfacial shear stress of stratified gas-liquid two-phase flow in horizontal pipe is established in this paper,in which the interface is considered as a flat slip wall with uniform shear stress.The gas flow field is simulated by FLUENT.Compared with experimental values of gas velocity properties,the convergence values of gas flow rate and interfacial shear stress are obtained,and a new constitutive relation of interfacial friction factor and gas Reynolds number is deduced from the convergence values fitting.And the interfacial shear stress is predicted,which is in good agreement with the experimental data,and better than that of Taitel Dukler and SidiAli Gatignol models when the gas Reynolds number is from 9 400 to 50 000 and the liquid Reynolds number is from 21 000 to 30 000.The results show that the slip-shear-wall model can control the key parameters effectively,improve the prediction efficiency and accuracy,and provide a new approach to the prediction of interfacial shear stress of stratified gas-liquid flow by CFD.