电加热结构内纳米流体稳定性实验研究  

Experimental Study on the Stability of Nanofluids in an Electric Heating Structure

作　　者：郑丹 王哲 陈占秀[1] 朱恒宣[1] 王进[1] ZHENG Dan;WANG Zhe;CHEN Zhan-Xiu;ZHU Heng-Xuan;WANG Jin(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《工程热物理学报》2021年第4期973-978,共6页Journal of Engineering Thermophysics

基　　金：河北省自然科学基金(No.E2020202121,No.E2019202184)。

摘　　要：实验以比例为4:6的乙二醇水溶液(EGW)为基液,采用两步法制备了质量分数为0.5%、1.0%、1.5%和2.0%的Cu-EGW、Al_(2)O_(3)-EGW和Fe_(3)O_(4)-EGW纳米流体。通过分段加热测试,对比分析了三种纳米流体在电加热结构中的加热效果,并研究了Cu-EGW纳米流体的热稳定性。实验结果表明,在三种纳米流体中Cu-EGW纳米流体获得了最优的加热效果;在30天后再次测试发现以Cu-EGW纳米流体作为加热工质时,中间翅片上部平均温度降低了7.4%,被加热环境平均温度降低了3.8%。In order to prepare Cu,Al_(2) O_(3) and Fe_(3) O_(4) nanofluids with various mass fractions(0.5%,1.0%,1.5%and 2.0%)by a two-step method,the mixture of the ethylene glycol and deionized water(EGW)with a ratio of 4:6 was used as base fluid.The heating effect of these nanofluids in an electric heating structure was comparatively analyzed in different stages.Thermal stability tests of the Cu-EGW nanofluid were also conducted.Results indicate that the Cu-EGW nanofluid shows the best heating effect in the tested nanofluids.It is found that at the 30-day retest,when Cu-EGW nanofluid is used as the heating medium,the average temperature values of the middle fin and ambient air are reduced by up to 7.4%and 3.8%.

关 键 词：纳米流体 电加热结构 热稳定性 加热效率 

分 类 号：TK172[动力工程及工程热物理—热能工程]