期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 83, 期 -, 页码 753-761出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2014.12.067
关键词
Nanoparticle Enhanced Ionic Liquid (NEILs); Density; Viscosity; Heat capacity; Thermal conductivity; Convective heat transfer coefficient; Nusselt number; Rayleigh number
资金
- Department of Energy (DOE) Solar Energy Technology Program
- U.S. Department of Energy [DEAC09-08SR22470]
Experimental investigations were carried out regarding natural convection heat transfer of Nanoparticle Enhanced Ionic Liquids (NEILs) in rectangular enclosures of two different sizes with dimensions length x width x height, 50 x 50 x 50 mm and 50 x 50 x 75 mm in heated from below. The NEILs were synthesized by dispersing different wt% (0.5, 1.0, and 2.5) of aluminum oxide (Al2O3) nanoparticles of two different particle shapes (spherical and whiskers) into N-butyl-N-methylpyrrolidinium bis{(trifluoromethyl)sulfonyl} imide, ([C(4)mpyrr][NTf2]) ionic liquid (IL). Heat transfer related thermophysical properties, i.e. density, viscosity, thermal conductivity, and heat capacity of base IL and NEILs were also measured and reported. The experimental measurement shows enhanced density, thermal conductivity, viscosity, and heat capacity of NEILs compared to the base IL and they increase with the nanoparticle concentration. However natural convection heat transfer coefficient was observed to deteriorate for the NEILs compared to the base IL irrespective of the shapes of the particles and aspect ratio of the enclosure and the deterioration increases with the increase of nanoparticle concentration. Interestingly spherical Al2O3 NEILs was observed to affect more adversely compared to the whiskers Al2O3 NEILs. The observed degradation of the heat transfer performance of the NEILs could not fully be explained by the change of thermophysical properties, which indicates that other factors may play significant roles in this phenomenon and the possible reasons of the degradation is discussed in this paper. (C) 2015 Elsevier Ltd. All rights reserved.
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