Abstract:

The single?phase and two?phase flow friction pressure drops of oil and water phase fluids in a rectangular copper?based microchannel with a hydraulic diameter of 895 μm were tested, and the experimental data were also compared with the existing single?phase and two?phase flow friction pressure drop prediction models. The effects of mass flux and ratio between oil and water on friction coefficient and pressure drop were investigated. The results show that the friction coefficient of oil is significantly higher than that of water, and Hagen?Poiseuille equation can accurately predict the pressure drop of oil or water single?phase fluid flow in the channel. The mass flux of both oil phase and water phase affect the pressure drop of the liquid?liquid two?phase flow significantly, and the friction pressure drop of the two?phase flow increases with the increasing working fluid flow rate and oil phase content. The homogeneous flow model established by Cicchitti (1960) can predict the mixing viscosity of oil?water two?phase fluids relatively accurately. In order to improve the prediction accuracy, a prediction correlation formula for the friction coefficient of oil?water two?phase flow is established, and the predicted value is in good agreement with the experimental value.

Key words: Microchannel, Single phase flow, Oil?water two phase flow, Pressure drop, Model and correlations

摘要：

测试了油相及水相流体在水力学直径为895 μm的矩形铜基微通道内的单相及两相流摩擦压降，并将实验数据与已有的单相及两相流摩擦压降预测模型进行对比。主要考察油相、水相质量通量及两者比率对摩擦系数及压降的影响。结果表明，油的摩擦系数显著高于水的摩擦系数，Hagen?Poiseuille方程能够准确预测微通道内油或水的单相流体压降；油相及水相质量通量均显著影响液?液两相流压降，油水两相流体流量越大，油相含量越高，两相摩擦压降越高；Cicchitti模型能够相对准确地预测油水两相流体混合黏度。为提升预测准确度，建立了油水两相流摩擦系数预测关联式，预测值与实验值吻合较好。

关键词: 微通道, 单相流, 油水两相流, 压降, 模型关联式