矩形微槽内水的流动沸腾压降特性实验研究

An experimental investigation of the pressure drop of water in a horizontal rectangle micro-groove

对截面尺寸为0.4 mm×0.2 mm,水力直径为0.267 mm水平布置的不锈钢矩形微槽内水的流动沸腾压降特性进行了实验研究.实验结果表明:当L-M参数X较小时,两相摩擦压降修正因子Φ2FL随X的增大而减小,相同进口温度下,Φ2FL的变化随流量的增大而增大;当X大于0.3时,Φ2FL随X增大而增大,且几乎不受流量的影响.在实验结果基础上,考虑水力直径及流量的影响,在本实验范围内导出了新的矩形单微槽内水流动沸腾的压降关联式,其预测本实验结果的误差在12.6%以内.

This poper described an experimental investigation of the pressure drop of water in a rectangle horizontal micro-groove of 0. 267 mm with a across section of 0.4 mm×0.2 mm. The results reveal that along with the Lockhat-Martinelli parameter increasing, the two-phase frictional factor first decreased and affected by the mass flux. However, the trend was opposite when the parameter was larger than 0. 3. Based on the experimental results, a new correlation integrated with mass flux and hydrodynamic diameter of pressure drop with water in a horizontal rectangle micro-groove is proposed and the veracity was less than 12.6 %.