纳米流体在电加热器中传热特性的实验研究  

Experimental study on heat transfer characteristics of nanofluids in an electric heater

作　　者：翟郑佳 李坦 朱恒宣[1] 杨历[1] 王进[1] ZHAI Zhengjia;LI Tan;ZHU Hengxuan;YANG Li;WANG Jin(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300130

出　　处：《河北工业大学学报》2021年第2期43-48,54,共7页Journal of Hebei University of Technology

基　　金：国家自然科学基金(51576059);河北省自然科学基金(E2016202266)。

摘　　要：对在家用电加热器中使用的4种纳米流体进行对流换热实验研究。采用两步法制备纳米流体,研究不同材料(MgO、SiO_(2)、Al_(2)O_(3)和CuO)和不同浓度(质量分数为0.2%~1.0%)的纳米流体对电加热器换热效率的影响。结果表明,电加热器翅片温度对环境温升影响较大;纳米流体浓度相同时,MgO流体的换热效率最高,SiO_(2)流体的换热效率最低,且电加热器的换热效率随纳米流体浓度的增大而增大;与基液相比,质量分数为1.0%的MgO流体可使环境温度提升约30%。This research aims at the natural convection in electric heaters filled with nanofluids.The effect of four nanofluid materials(MgO,SiO_(2),Al_(2)O_(3) and CuO)and various nanoparticle concentrations(mass fraction is 0.2%-1.0%)on heating efficiency of electric heater were studied,and results show that temperature of the fin has great effect on environment temperature.At the same nanoparticle concentration,MgO-water nanofluid has the highest heating efficiency,whereas SiO_(2)-water nanofluid is the lowest one.Moreover,the heating efficiency of the electric heater increases with the increase in nanofluid concentration.So it is found that the MgO-water nanofluid with a mass fraction of 1.0%obtains about 30%enhancement of heat transfer on the environment temperature.

关 键 词：纳米流体 电加热器 自然对流 强化传热 

分 类 号：TM924.2[电气工程—电力电子与电力传动]