油水两相管流反相模型研究

Improved phase inversion model during oil-water two phase fluid flow in pipeline

建立了管壁剪切应力与管流扰动动能之间的关系。利用扰动动能与乳状液液滴界面自由能之间的平衡关系,推导了形式简洁的液滴直径模型。结合系统最小自由能理论,获得了改进的反相含水率预测模型。利用已公布的油水两相管流反相实验数据,将模型与已有的反相模型对比表明:当油品黏度较低时,该模型的预测精度明显优于其他反相模型;当油品黏度较高时,各反相模型的预测结果均不理想。

The turbulent kinetic energy was estimated by use of the shear stress on the wall of pipe, and a simplified model for calcu lating the size of liquid drop in liquid-liquid dispersion was developed on the basis of a balance between the turbulent kinetic energy of the liquid phase and the surface energy of dispersed liquid drops. The criterion of the minimum free energy was combined with the drop size model to predict the critical water fraction for phase inversion. The experimental data from the available literatures were used to validate the improved phase inversion model and other models proposed by Yeh, et al. The results show that the precision of the improved model is prior to any others when the oil viscosity is below 100 mPa.s. The existing phase inversion models are unfavorable to predict the critical water fraction when the viscosity of oil product is high.