Experimental investigation on heat transfer characteristics of various nanofluids in an indoor electric heater

被引：31

作者：

Chen, Zhanxiu ^{[1
]}

Zheng, Dan ^{[1
]}

Wang, Jin ^{[1
]}

Chen, Lei ^{[2
]}

Sunden, Bengt ^{[3
]}

机构：

[1] Hebei Univ Technol, Sch Energy & Environm Engn, Tianjin 300401, Peoples R China

[2] Xi An Jiao Tong Univ, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China

[3] Lund Univ, Div Heat Transfer, Dept Energy Sci, POB 118, SE-22100 Lund, Sweden

来源：

RENEWABLE ENERGY | 2020年 / 147卷

基金：

中国国家自然科学基金;

关键词：

Electric heater; Nanofluid; Magnetic field; Natural convection; Equilibrium temperature; ENTROPY GENERATION ANALYSIS; THERMAL-CONDUCTIVITY; TRANSFER ENHANCEMENT; ETHYLENE-GLYCOL; HYBRID NANOFLUIDS; MAGNETIC-FIELD; VISCOSITY; FERROFLUIDS; PERFORMANCE; FLOW;

D O I：

10.1016/j.renene.2019.09.036

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Heat transfer characteristics of an electric heater were experimentally investigated by using various fluids in this paper, including Cu-EGW (a mixture of ethylene glycol and DI-water), Al2O3-EGW, Fe3O4-EGW nanofluids. A 4:6 mixture of ethylene glycol and deionized water was used as the base liquid. All these nanofluids were prepared by ultrasonic treatment, and nanoparticle mass concentration of samples varies from 0.5% to 2%. In addition, natural convective heat transfer of Fe3O4 -EGW nanofluid in an electric heater was carried out by considering an effect of different magnetic fields. The results indicated that heat transfer performance of Cu-EGW nanofluid was significantly higher than the Al2O3-EGW and Fe3O4-EGW nanofluids, and the heating efficiency of the Cu-EGW nanofluid increased with the mass concentration of Cu particles. Compared with that of the base fluid, equilibrium temperature values of electric heaters filled with 2.0% Cu-EGW, 1.0% Al2O3-EGW and 1.0% Fe3O4-EGW nanofluids increase by 13.18%, 3.77% and 4.52%, respectively. It was also found that the magnetic field had a positive effect on the heat transfer enhancement of the Fe3O4-EGW nanofluid. In addition, for the 0.5% Fe3O4 nanofluid under a magnetic intensity of 100 mT, the equilibrium temperature on the middle fin increases by 14.68%. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：1011 / 1018

页数：8

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