Heat transfer of swirling impinging jets with TiO2-water nanofluids
作者： K. Wongcharee , V. Chuwattanakul , S. Eiamsa-ard
DOI: 10.1016/J.CEP.2017.01.004
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摘要: Abstract An experimental work has been carried out to study the heat transfer of swirling impinging jets (SIJs) with TiO2-water nanofluids using thermochromic liquid crystal technique. Experiments were at constant jet-to-target spacing ratio (L/D) 1.0, 2.0, 3.0 and 4.0 for Reynolds numbers from 5000 20,000 by TiO2 concentrations 0.5%, 1.0%, 1.5%, 2.0% 2.5% volume, twisted tapes twist ratios (y/W) 4.0, 5.0, 6.0 7.0. Conventional (CIJs) pure water also tested, comparison. At similar operation conditions, offer superior conventional jets. It is found that 1.5% volume give higher Nusselt than base fluid (water) while one concentration shows opposite result. Over studied range, optimum condition where maximum number achieved y/W = 6.0.
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