过载加速度下涡旋微槽内单相流动特性实验

以体积浓度30%的乙二醇水溶液为工质,对槽宽0.5mm,深宽比为2、3、4的矩形截面涡旋微槽试件在过载加速度条件下的流动特性进行了实验研究。试件所用材料为紫铜,每个试件上按两行分布6个涡旋微槽,所承载加速度由离心式过载加速度试验机提供。分析了不同深宽比的涡旋微槽在不同工质流量和不同过载加速度下的流动特性,得出了微槽结构、工质流速对其流动特性的影响。结果表明,加速度方向对微槽内流动特性有着决定性的影响,且加速度越大,摩擦阻力系数越大。在过载加速度条件下Dean数是决定涡旋微槽抵御和适应过载加速度对其流动特性影响的重要因素。

Experiments of single phase flow characteristics for swirl microchannel under overload acceleration

The experiment of flow characteristics in rectangular cross section swirl microchannel test pieces under acceleration overload condition was conducted with ethylene glycol solution of 30%（volume concentration）.Three swirl microchannels test pieces with width of 0.5mm and different depths were considered.Each test piece was made of copper with six microchannels contained,and the acceleration loaded was provided by centrifugal acceleration test machine.Flow characteristics of the swirl microchannels under different acceleration situations were investigated with various conditions of fluid flux,and the influence of microchannel structure and liquid velocity was gained.The results show that the acceleration direction has significant effect on the flow resistance of swirl microchannels,and the ability of swirl microchannel against the influence of acceleration condition is significantly affected by the Dean number.