水-铜纳米流体强化小型毛细泵回路换热特性  

Thermal performance of small capillary pumped loop using water-Cu nanofluids

作　　者：吕伦春[1] 刘振华[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《化工学报》2008年第11期2713-2717,共5页CIESC Journal

摘　　要：在稳定的低压条件下,对以水-Cu纳米流体为工质的小型平板式毛细泵回路（CPL）的换热特性进行了实验研究。实验中纳米颗粒的平均粒径为20 nm,纳米流体质量分数为0.2%～2.0%。工作压力为5.62、9.58、15.74 kPa。研究了纳米颗粒质量分数和运行压力对CPL换热性能、最大热通量和热阻的影响。实验结果表明,水-Cu纳米流体替代纯水能够显著提高CPL的换热性能,蒸发器的传热系数最大可提高40%,最大热通量提高18%。存在着一个对应于最大强化换热能力的最佳质量分数,在实验压力范围内最佳纳米颗粒质量分数为1.0%。水-Cu纳米流体是一种适合在CPL中使用的强化传热工质。运行压力对CPL换热特性也有明显影响,压力越高,CPL换热的强化效果越显著。An experimental study was carried out to investigate the thermal performance of a capillary pumped loop（CPL）using water-Cu nanofluid as the working fluid.The study was focused on the influence of the Cu nanoparticle mass fraction and the operation pressure on the heat transfer coefficients of the evaporator,the maximal heat flux and the total thermal resistance.The experimental results indicated that the thermal performance of the CPL was improved by addition of Cu nanoparticles.There existed an optimum nanoparticle mass fraction about 1.0%.The influence of operation pressure on both the evaporating heat transfer coefficient and the maximal heat flux was remarkable.The heat transfer coefficient and maximal heat flux increased with increasing operation pressure.Compared with water,the evaporating heat transfer coefficient and maximal heat flux for nanofluid could increase by 40% and 18%,respectively when the nanoparticle mass fraction was 1.0% and the operation pressure was 15.74 kPa.

关 键 词：纳米流体 热管 毛细泵回路 强化换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]