低干度两相流工质在矩形流道冷板内的 换热特性实验研究
Experimental Study on Heat Transfer Performance of Low Quality Two？？Phase Working Medium in Cool Plate Evaporation with Rectangular Channels

为了提高电子设备在两相蒸发沸腾冷却换热系统中的冷却效果,对低干度两相流工质R22在矩形流道蒸发冷板内的换热特性进行实验研究。通过调节板式电加热的输入功率来控制工质进入蒸发冷板前的干度,从而得到不同负荷不同干度下系统的换热性能,结果表明:在低干度、低充灌量以及低流量的两相流蒸发冷却系统中,系统的换热能力随着干度的增大而降低。通过分析系统内部压力与流量的关系发现,系统内部压力受气液相比例影响,随系统负荷增大而增大,系统流量随系统内部压力的增大而增大,最终达到特定工况下的最大值。由此可见,低干度、低充灌量、低流量的两相流蒸发冷却系统对电子设备的降温效果是有利的,其可以降低系统能耗,保证系统运行安全,降低系统振动。该结果为板式两相流蒸发冷却系统设计提供了实验依据。
The heat transfer performance of the low quality two？？phase working medium R22 in cool plate evaporation with rectangular channels was experimentally studied with the purpose of improving the cooling effect of electronic equipment in two？？phase boiling heat transfer system. The quality of working medium before performing cool plate evaporation can be determined by controlling the input power of board？？type electric heating, hence the heat transfer performance can be obtained under different system loadings and qualities. The results showed that the heat transfer performance in two？？phase boiling heat transfer system under the condition of low quality，low charge and low flow rates decreased with the increase of quality. The relationship between the system pressure and flow rate was analyzed. It was showed that the system pressure increased with the system loading under the influence of vapor？？liquid ratio, and the system flow increased with the system pressure until reaching the maximum under special working conditions. So the two？？phase boiling heat transfer system has a positive impact on the cooling of electronic equipment under the condition of low quality, low charge and low flow, and the system can operate safely with a reduced vibration and energy consumption. In addition, the results can provide an experimental base for designing the board？？type two？？phase boiling heat transfer system