期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 117, 期 -, 页码 280-286出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2017.09.091
关键词
Thermal conductivity; Electrical conductivity; SiO2 nanofluids; Electrical conduction mechanism; Thermo-electrical conductivity ratio
资金
- National Natural Science Foundation of China [51676054]
In this paper, the thermal conductivity and electrical conductivity of SiO2 nanofluids using mixture of ethylene glycol (EG) and water (HO2) as the base fluid are investigated. The two-step method was used to prepare SiO2-EG/H2O nanofluids with a mass concentration of 0.3%. The variations in thermal conductivity and electrical conductivity as functions of EG concentration (0-100%, v/v) and temperature (25-45 degrees C) are present. Experimental results showed that the thermal conductivity and electrical conductivity of SiO2-EG/H2O nanofluids both decreased as the EG content percentage increases in the EG/H2O mixture. At a specific EG content percentage, thermal conductivity and electrical conductivity both increased with the increase in temperature. To better evaluate the enhancement performance of SiO2-EG/H2O nanofluids, the relative electrical conductivity was introduced and studied explicitly. The mechanism of electrical conductivity enhancement in SiO2-EG/H2O nanofluids was analyzed in detail. Meanwhile, the ratio of thermal conductivity and electrical conductivity was also discussed. (C) 2017 Published by Elsevier Ltd.
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