纳米流体及分散剂对重力热管性能影响试验

摘要

为了研究纳米流体及分散剂对重力热管性能的影响,对各热管的启动性能(启动时间和启动温度)以及传热性能(稳定运行时管壁温度分布和总热阻的大小)进行了测试.结果表明:纳米颗粒的添加及其物理性质对热管的启动时间有影响,添加纳米流体的热管,启动时间较传统去离子水热管明显缩短1.3~3.2 min;分散剂的添加对热管的传热性能也有影响,在高热流密度工况下,以十二烷基硫酸钠(SDS)为分散剂的热管性能明显优于以阿拉伯树胶(AG)为分散剂的纳米流体热管;添加分散剂的纳米流体热管热阻较去离子水热管降低26.4%~63.9%.%To investigate the effect of nano-fluid and dispersant on the performance of gravity heat pipe, the starting performance (start-up time and start temperature) and the heat transfer performance (tube wall temperature distribution at stable state and total thermal resistance) of different heat pipes were determined separately.The results show that the addition and the physical properties of nanoparticles have effects on the start-up time of heat pipe.The start-up time of heat pipe with nano-fluid is 1.3~3.2 min shorter than that of the conventional one with deionized water as working fluid.The addition of dispersant also affects the heat transfer performance of heat pipe.Under the condition of high heat flux, the performance of nano-fluid heat pipe with twelve sodium alkyl sulfate (SDS) as dispersant is better than that with arabia gum (AG) as dispersant.The thermal resistance of nano-fluid heat pipe with dispersant is significantly decreased by 26.4%~63.9%.