矩形微通道内油水两相流摩擦压降实验研究

Experimental Study on Frictional Pressure Drop of Oil-Water Two-Phase Flow in Rectangular Microchannels

研究了微通道内油水两相流的摩擦阻力特性.实验采用横截面为矩形的微通道,其宽度和深度通过化学蚀刻法制作,壁面具有一定的粗糙度,其水力直径分别为167.3μm和192.0μm,相应高宽比为0.673和0.793.利用数字显微摄像技术对矩形截面微通道内油-水两相流的流型进行实时观测,并根据流型选择合适的物理模型,得到了不同含油率时矩形微通道的摩擦压降.实验结果表明:矩形微通道内的摩擦阻力压降与均相理论模型计算结果一致,黏度机理是影响微通道内油水两相流摩擦压降的主要因素.水包油流型向油包水流型的转变是在含油率为60%～70%范围内发生的.

The frictional resistance characteristics of oil-water two-phase flow are experimentally investigated in microchannels,which are processed on the silicon substrate by the micro-etching technique.The hydraulic diameters are 167.35μm and 192.00μm,and the corresponding aspect ratio are 0.673 and 0.793.The appropriate physical model was used in calculating frictional resistance based on real time observation on two-phase flow pattern in horizontal channels.The experimental results indicate that the frictional pressure drop in the rectangular microchannel is consistent with the results of the homogeneous theoretical model.Viscosity mechanism is the main factor affecting frictional pressure loss for oil-water two-phase flow.A transition of oil in water to water in oil occurs whenΦois from 60%to70%.