Heat transfer correlations for PCM-based heat sinks with plate fins |
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| Authors: | SK Saha P Dutta |
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| Affiliation: | 1. Fluids & Thermal Engineering (FLUTE) Research Group, Faulty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK;2. Department of Mechanical Engineering, University of Engineering and Technology, Taxila, Pakistan;3. Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;4. College of Engineering, Mechanical Engineering Department, Babylon University, Babylon City, Hilla, Iraq;5. Faculty of Chemical & Petroleum Engineering, University of Tabriz, 51666-16471, Iran;1. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;2. Public Authority for Applied Education and Training (PAAET), College of Technological Studies (CTS), Automotive and Marine Engineering Department, Shuwaikh, 70654, Kuwait;3. Division of Computational Mechatronics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam;4. Faculty of Electrical & Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam;1. University of Carthage, Science Faculty of Bizerte, 7021 Bizerte, Tunisia;2. University Lille Nord de France, F-59000 Lille, UVHC, TEMPO, F-59300 Valenciennes, France;1. Center of Research Excellence in Renewable Energy (CoRE-RE), King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;2. Department of Mechanical Engineering, University of Engineering and Technology, Taxila, Pakistan;3. Department of Mechanical Engineering, HITEC University, Taxila, Pakistan |
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| Abstract: | Characterization of melting process in a Phase Change Material (PCM)-based heat sink with plate fin type thermal conductivity enhancers (TCEs) is numerically studied in this paper. Detailed parametric investigations are performed to find the effect of aspect ratio of enclosure and the applied heat flux on the thermal performance of the heat sinks. Various non-dimensional numbers, such as Nusselt number (Nu), Rayleigh number (Ra), Stefan number (Ste) and Fourier number (Fo) based on a characteristic length scale, are identified as important parameters. The half fin thickness and the fin height are varied to obtain a wide range of aspect ratios of an enclosure. It is found that a single correlation of Nu with Ra is not applicable for all aspect ratios of enclosure with melt convection taken into account. To find appropriate length scales, enclosures with different aspect ratios are divided into three categories, viz. (a) shallow enclosure, (b) rectangular enclosure and (c) tall enclosure. Accordingly, an appropriate characteristic length scale is identified for each type of enclosure and correlation of Nu with Ra based on that characteristic length scale is developed. |
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