摩擦流：两相互接触的物体或气流，有相对运动或有相对运动趋势时在接触处产生阻力的现象，是摩擦学研究的重要内容。因摩擦而产生的阻力称为摩擦流。
粘性是液体流层问相对运动而产生的摩擦力或阻力。油层间所产生的运动阻力称为粘性摩擦力。
Viscous friction is the fiction, or resistance to relative motion, between adjacent layers of liquid. The resistance of motion between these oil layers is called viscous friction.
分析了偏心距和旋转对于二次流以及轴向速度分布的影响，同时给出了平均摩擦系数和壁面摩擦力的分布。
Effects of eccentricity and rotation on the secondary flow and maximal axial velocity were analyzed, and the average friction factors and the wall friction distributions were also presented.
分别以油气、气水为工质，对立式螺旋管内气液两相流的摩擦阻力特性进行实验研究。
With oil, gas, water as working fluids, the experiment studies of frictional pressure drop characteristics of oil gas, gas water two phase flow in vertical helically coiled tubes were carried out.
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