Jet impingement heat transfer in a frost-free refrigerator: The influence of confinement |
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| Authors: | M Imraan RN Sharma |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;2. Refrigerator R&D Center, Panasonic R&D Center Suzhou Co., Ltd., Suzhou 215123, China;1. School of Architecture, Harbin Institute of Technology, Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology, Ministry of Industry and Information Technology, Harbin 150090, China;2. Department of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China;3. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China |
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| Abstract: | Heat transfer characteristics of a slot air jet (width w) impinging on a circular cylinder (diameter d = w) located 5d from the jet exit in a confined space have been studied for Reynolds number (based on cylinder diameter and mean jet velocity) in the range of 1000–12,000. This situation is found in a frost-free refrigerator, amongst other rapid food refrigeration applications. The results reveal that the slot jet impinging on a circular cylinder in a confined space yields heat transfer rates that are between those for the corresponding uniform cross-flow (lower limit) and slot jet impingement on a non-confined cylinder (upper limit) cases. A dimensionless confinement spacing H/d = 10 was found at which the heat transfer rate was a minimum. CFD analysis revealed that this was due to periodic jet flapping and generation of large flow structures between the cylinder and the confining wall. |
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