期刊
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
卷 90, 期 -, 页码 23-28出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2017.10.005
关键词
Hybrid nanofluid; Non-hybrid nanofluid; Thermal conductivity; Surfactant; pH; Sonication time
资金
- Ministry of Higher Education, Malaysia [RACE/F3/TK1/UPNM/9]
- Universiti Pertahanan Nasional Malaysia [RACE/F3/TK1/UPNM/9]
Heat transfer fluid with low thermal conductivity limits the efficiency of thermal systems, such as heat exchangers, which require heat transfer fluid with high thermal conductivity. There is a demand to synthesize heat transfer fluids with high thermal conductivity. The emergence of nanoparticles has led to the development of nanofluids. Nanofluids can be classified as non-hybrid and hybrid nanofluids. This study investigated the thermal conductivity characteristics of a copper-titanium dioxide (Cu-TiO2 ) hybrid nanofluid and compared with those of a non-hybrid (Cu and TiO2 ) nanofluid. In addition, the effects of various factors (weight percentages of the nanoparticles, types of surfactants, pH values of the base fluid solution and sonication times) on the thermal conductivity of theCu-TiO2 hybrid nanofluid were studied. The thermal conductivity of theCu-TiO2 hybrid nanofluid increased in accordance with an increment in the weight percentage of the nanoparticles. The hybrid nanofluid containing 0.8 wt% of Cu-TiO2 and polyvinylpyrrolidone (PVP) as surfactant showed the highest thermal conductivity, exhibiting an improvement of 9.8% , compared to that of the base fluid.
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