SiO2-乙醇纳米流体重力热管传热性能的试验研究  

Experimental Research on Heat Transfer Performance of SiO2-Ethanol Nanofluid Gravity Heat Pipe

作　　者：杨文斌 杨峻[1] YANG Wen-bin;YANG Jun(College of mechanical and power engineering,Nanjing Tech University,Jiangsu Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《当代化工》2019年第12期2962-2966,共5页Contemporary Chemical Industry

摘　　要：在Maxwell所提出的关于悬浮液导热系数的模型的基础上考虑了布朗运动、纳米颗粒之间的团聚和固液界面液膜层内液体分子规则排列对纳米流体导热系数的影响,研究了SiO2-乙醇纳米流体的热传导性能,推导出了纳米流体导热公式,在不同质量分数、不同充液率以及不同粒径下对单管传热进行试验研究。结果表明:改进后的模型导热系数比原模型更大;相同粒径和充液率的纳米流体,质量分数在1.5%时传热效果最好;相同粒径和浓度的纳米流体,充液率32%时传热效果最好;相同浓度和充液率的纳米流体,15~20nm的SiO2纳米流体传热效果更高。纳米流体的传热系数随着纳米颗粒平均粒径的减小而增大,这与推导的模型结果相符合。Based on Maxwell’s model of thermal conductivity of suspension,considering the effect of Brownian motion,agglomeration of nanoparticles and regular arrangement of liquid molecules in liquid film at solid-liquid interface on thermal conductivity of nanofluids,the thermal conductivity of SiO2-ethanol nanofluids was studied,and the thermal conductivity formula of nanofluids was deduced.The heat transfer of single tube was experimentally studied under different mass fraction,filling rate and particle size.The results showed that,the thermal conductivity of improved model was larger than that of the original model;When the mass fraction of nanofluids with the same particle size and filling rate was 1.5%,the heat transfer effect was the best;The heat transfer efficiency of nanofluids with the same particle size and concentration was the best when the filling rate was 32%;For nanofluids with the same concentration and filling rate,the heat transfer efficiency of SiO2 nanofluids with 15~20 nm was higher.The heat transfer coefficient of nanofluids increased with the decrease of the average particle size,which was consistent with the derived model.

关 键 词：纳米粒子 纳米流体 传热系数 重力热管 传热 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TK172.4[动力工程及工程热物理—热能工程]