微圆管内相变微胶囊悬浮液换热特性研究  

Experimental Study on Heat Transfer Characteristics of Microencapsulated Phase Change Material Suspension in Micro-Circular Tube

作　　者：钟小龙[1] 刘东[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：《激光与光电子学进展》2015年第11期143-149,共7页Laser & Optoelectronics Progress

基　　金：国家基金科学基金(51306156);西南科技大学研究生创新基金(14ycx095)

摘　　要：通过实验研究了相变温度为50℃的相变微胶囊悬浮液在1 mm微小圆管内的换热特性,并与相同条件下的蒸馏水换热进行了对比。结果表明,在雷诺数（Re）为300~1000范围内,不同浓度的相变微胶囊悬浮液平均换热系数和平均努塞尔数（Nu）均高于蒸馏水,且随Re的增加而增大;相同Re下,相变微胶囊悬浮液的平均壁面温度低于蒸馏水,且随Re的增大而减小;随着相变微胶囊质量分数的增加,平均换热系数和平均Nu逐渐增大、平均壁面温度逐渐降低。By contrast with distilled water under the same condition, heat transfer characteristics of microencapsulated phase change material suspesion （MEPCMs） of which the phase change temperature is 50 ℃ are investigated in a micro-tube of radius of 1 mm. It appears that for Reynolds number （Re） ranging from 300 to 1000 both the average heat transfer coefficient and the average Nusselt number （Nu） of MEPCMs with different mass concentrations are higher than that of distilled water, and increase with Reynolds number increasing. Moreover, the wall temperature of the MEPCMs suspension is lower than that of the distilled water at the same Reynolds number, and it decreases as Re increases. In addition both the average heat transfer coefficient and the average Nusselt number increase as the mass concentration of MEPCMs increases, whereas the wall temperature decreases.

关 键 词：测量 冷却 相变材料 微胶囊 悬浮液 圆管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]