摘要
研究非极性流体在微通道内的流动特性。采用的微流动实验台通过测量不同极性液体流过矩形截面微通道中流量与压力,分析了不同极性流体的阻力特性。结果表明:对分子量较小的极性液体,微通道内流量-压差关系符合Hagen-Poiseuille定律,连续介质模型仍适用于微米尺度微通道;对分子量较大的非极性液体,常规理论在预测微通道内流量-压差、摩擦阻力系数-雷诺数关系时存在较大误差,须进行修正。
Flow characteristics of non-polar liquids in microchannels was investigated. Microfluidics experimental platform was used in measuring the flow rate at the corresponding pressure in rectangular microehannels, and the resistance characteristics of liquids with different polar were analyzed. The experimental results show that the relation of flow rate versus pressure difference meets the principle of Hagen-Poiseuille well while the media is polar liquid with minor molecular weight, and continuous medium hypothesis can apply to micro-sized channel. The major error was found in predicting the relation of flow rate-pressure difference, friction factor-Reynolds number by conventional theory while the media is non-polar liquid with major molecular weight, so the conventional theory must be revised before used to predict the flow characteristics in mierochannels.
出处
《润滑与密封》
CAS
CSCD
北大核心
2011年第8期67-70,共4页
Lubrication Engineering
