纳米流体冲击射流换热特性实验_孙斌.pdfVIP

2334 CHEMICAL INDUSTRY AND ENGINEERING PROGRESS 2016 35 8 孙斌，曲艺，杨迪 132012 以纳米流体为工质对冲击射流冷却系统的综合性能进行实验，主要研究了添加纳米颗粒的纳米流体与水 在不同流速、不同射流高度等条件下冲击射流的传热效率，同时也对不同种类的纳米流体的换热效率进行了对 比。结果表明：对于添加了纳米颗粒的冲击射流冷却系统，传热效率得到显著提高，但当质量分数达到0.5%时， 传热系数变化不明显。对于不同种类的纳米流体：Cu-水、Al O -水和Al-水纳米流体，其中Cu-水的换热效率最 2 3 高，存在一个特定的射流高度，使传热系数达到最大值。研究结果对设计制造轻型紧凑的高效换热器有实用的 工程价值。 纳米粒子；多相流；传热；冲击射流 TK 121 A （2016 DOI 10.16085/j.issn.1000-6613.2016.08.05 Experimental study on heat transfer characteristics of nanofluids impacted jet SUN Bin ，QU Yi ，YANG Di Energy and Power Engineering InstituteNortheast Dianli University Jilin 132012JilinChina Abstract In this papercomprehensive performance of impinging jet cooling system heat exchanger was experimentally studied using nanofluids. The heat transfer efficiencies were compared for nanofluids of different flow ratesjet height and types . The results revealed that heat transfer efficiency significantly increased with the introduction of nanofluids in jetbutwhen the mass percentage of nanofluids exceeded of 0.5%the heat transfer coefficient did not change significantly. For different types of nanofluids Cu- waterAl O -waterAl-water nanofluidsthe highest heat transfer efficiency 2 3 was observed for Cu- water. In additionthere was a particular jet heightwhere the maximum heat transfer coefficient could be reached. The results would be practically valuable in designing and manufacturing light and efficient heat exchanger. Key words nanoparticles multiphase flow heat transfer impinging jet BARDBURY[3]