含纳米粒子流体的纳米颗粒参数对强化小型毛细泵回路热管换热性能的影响  

The Effects of the Nanoparticle Parameters on Thermal Performance of Small Capillary Pumped Loop Using Nanofluid

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：《宇航学报》2009年第3期1271-1275,共5页Journal of Astronautics

摘　　要：对以铜-水和氧化铜-水的纳米流体为工质的小型平板毛细泵回路（CPL）进行了实验，研究了纳米颗粒参数；包括质量浓度、纳米颗粒种类以及纳米颗粒粒径对CPL换热特性的影响。实验中采用了平均粒径为50nm的CuO粒子，20nm和50nm的Cu粒子，流体中纳米颗粒质量浓度为0.1wt％-2.Owt％，工作压力固定在15.74kPa。实验结果表明，纳米流体替代纯水后，蒸发器的换热系数和最大热流密度显著提高，从而提高了CPL的换热性能。质量浓度对换热特性有明显影响，存在着一个对应最大换热强化能力的最佳质量浓度。对于铜纳米颗粒而言，其最佳纳米颗粒质量浓度为1.0wt％，而对于氧化铜纳米颗粒而言，其最佳纳米颗粒质量浓度为0.5wt％。纳米颗粒的种类和平均粒径大小对换热性能强化能力也有很大影响：对于粒径相同的纳米颗粒而言，铜-水纳米流体的CPL换热性能高于氧化铜-水纳米流体的换热性能；对于同种类型的纳米流体而言，小粒径纳米颗粒对CPL换热性能的强化作用大于大粒径纳米颗粒对换热性能的影响。Abstract： An experimental study was performed to investigate the effect of nanoparticle parameters, including the nanoparticle sizes, nanoparticle kinds and nanoparticle mass concentrations, on the thermal performance of a small plate capillary pumped loop （CPL） using nanofluids. Pure water, water based Cu nanofluid and water based CuO nanofluids were used in the present experiment. The experiments was carried out under the conditions that a fixed operating pressure of 15.74 KPa and the nanoparticle mass concentration ranged from 0.1 to 2.0 wt%. The experiment results indicated that the CPL thermal performance is improved by using nanofluids. There exists an optimal particle mass concentration corresponding to the maximum heat transfer enhancement and this optimal concentration is 1 wt% to Cu nanofluid and 0.5 wt% to CuO nanofluid. Cu nanofluid has greater enhanced heat transfer effect than CuO nanofluid. And, the nanofluid with small size nanoparticles has greater enhanced heat transfer effect than that with great size nanoparticles.

关 键 词：CPL 纳米流体 强化换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]