Effects of heat exchanger tube geometries on nucleate pool boiling heat transfer in a scaled in-containment refueling water storage tank |
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| Affiliation: | 1. MJU-BNUT Department-Joint Research Center on Renewable Energy and Sustainable Marine Platforms, Engineering Research Center of Fujian University for Marine Intelligent Ship Equipment, Minjiang University, Fuzhou 350108, China;2. School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, NSW 2522, Australia;3. School of Chemical Engineering and Advanced Materials, University of Adelaide, South Australia;4. School of Engineering, University of Warwick, CV4 7AL, Coventry, United Kingdom;5. Department of Mathematics, Quaid-I-Azam University, Islamabad 44000, Pakistan;6. NAAM Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P.O.Box 80259, Jeddah, Saudi Arabia;7. Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam |
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| Abstract: | To determine the combined effects of the heat exchanger tube geometries of advanced light water reactors (ALWRs) passive residual heat removal system (PRHRS) on the nucleate pool boiling heat transfer in a scaled in-containment refueling water storage tank (IRWST), a total of 1,966 data (1,076 with horizontal tubes and 890 with vertical tubes) for q″ versus ΔT has been obtained using various combinations of tube diameters, surface roughness, and tube orientation. The experimental results show that (1) for both horizontal and vertical tubes, increased surface roughness enhances heat transfer whereas increased tube diameter decreases heat transfer, (2) both effects of the surface roughness and the tube diameter on the nucleate pool boiling heat transfer are significantly greater for vertical tubes than horizontal tubes, (3) the effectiveness of two heat transfer mechanisms, i.e., enhanced heat transfer dur to liquid agitation by bubbles generated and reduced heat transfer by the formation of large vapor slugs and bubble coalescence, depends on the combined effects of the heat flux, surface roughness, and the tube orientation. In addition, two different forms of empirical heat transfer correlations are obtained that fit present experimental data within +35 and ?20%. |
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