Flow-boiling heat transfer of R-134a-based nanofluids in a horizontal tube |
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| Authors: | Kristen Henderson Young-Gil Park Liping Liu Anthony M. Jacobi |
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| Affiliation: | 1. School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;2. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;1. School of Energy and Power Engineering, Northeast Dianli University, 132012, Jilin, China;2. College of Electrical Engineering, Xinjiang University, 830000, Urumqi, China;1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Centre of Research Excellence in Renewable Energy, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, 31261, Kingdom of Saudi Arabia;3. School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia |
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| Abstract: | The influence of nanoparticles on the flow-boiling of R-134a and R-134a/polyolester mixtures is quantified for flows of low vapor quality (x < 20%) over a range of mass fluxes (100 < G < 400 kg/m2 s). With direct dispersion of SiO2 nanoparticles in R-134a, the heat transfer coefficient decreases (as much as 55%) in comparison to pure R-134a. This degradation is, in part, due to difficulties in obtaining a stable dispersion. However, excellent dispersion is achieved for a mixture of R-134a and polyolester oil with CuO nanoparticles, and the heat transfer coefficient increases more than 100% over baseline R-134a/polyolester results. In the range of these experiments, nanoparticles have an insignificant effect on the flow pressure drop with the R-134a/POE/CuO nanofluid. |
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