微槽道内单相流动阻力与传热特性

对去离子水在微槽道中的单相流动阻力和传热特性进行了实验研究.结果表明，微槽道中的流动阻力特性及传热特性与常规尺度通道相比存在明显的差异，实验的fRe值高于传统理论预测值，并且随Reynolds数的增加而增大，而传热系数则明显小于传统理论预测值，分析表明微槽道的表面粗糙度对流动和传热有重要的影响.在热阻相同的情况下，提高工质的入口温度或增加热流通量，可减小实验段的压降.同时给出了层流区的流动阻力计算关系式.

Single-phase flow and heat transfer in micro-channels

Experiments on friction factor and heat transfer performances were conducted in micro-channels with deionized water as working fluid. It was found that the friction factor and heat transfer characteristics in micro-channels deviated from theoretical predictions for conventional channels. The measured fRe values was higher than classical theory prediction and increased with increasing Reynolds number, while heat transfer coefficient was lower than the prediction. The influence of surface roughness of channel wall, which was the possible reason for the deviation was discussed. It was also found that for the same thermal resistance, higher inlet temperature and heat flux were able to decrease pressure drop. The friction correlation for the lamina flow, was proposed on the basis of experimental data.