潜热型功能热流体在微小管道内的换热特性  

The heat transfer characteristics of latent functionally thermal fluid in micro tube

作　　者：刘东[1] 何蔚然 钟小龙[1] 胥海伦[1] 

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《化工进展》2016年第10期3042-3048,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金项目(51306156)

摘　　要：针对现代电子器件的散热需求,采用潜热型功能热流体为工作介质进行实验,并搭建流动换热实验台,研究5%、10%和15%质量分数下潜热型功能热流体与去离子水在微小圆形管道内的换热特性,结果表明,在雷诺数Re为300-1000范围内,潜热型功能热流体均表现出比水更好的冷却性能及更低的壁面温度,在实验测试范围内,相变引起的壁面温度降低率最大可达26.8%;潜热型功能热流体平均Nu随着流动Re数的增加而增加,并通过对实验数据分析,拟合了平均Nu数与流动Re数、质量浓度和流体Pr数的经验公式,最大偏差不超过7.5%,可以较好反应潜热型功能热流体的换热特性;潜热型功能热流体沿着管道长度方向的强化换热比与潜热型功能热流体浓度及流动Re数有关,存在强化换热的最佳长度。Due to its excellent heat transfer properties,the latent functionally thermal fluid shows a promise of application in high efficiency heat transfer area such as modern electronic devices cooling. To study the performance of the fluid,the heat transfer characteristics of 5%,10% and 15% mass concentration latent functionally thermal fluid as well as the deionized water was experimentally investigated in the present work. The results showed that the average Nu number increased with Re number,and by cooling with latent functionally thermal fluid,the temperature of the wall could be reduced by 26.8% compared with the deionized water for Re number ranging from 300—1000. To clearly demonstrate the relationship between the Nu number,Re number,mass concentration and Pr number,an experimental formula was further fitted based on the experimental data,the maximum relative error of 7.5%,acceptable for experiments. According to these results,a conclusion can be made that the heat enhancement ratio of the latent functionally thermal fluid on the length direction of the pipe is related to the mass concentration and Re number,moreover,there exists an optimum length,in which the heat transfer is most enhanced.

关 键 词：潜热型功能热流体 相变 悬浮液 传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]