Buoyancy-aided/opposed convection heat transfer for unsteady turbulent flow across a square cylinder in a vertical channel |
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| Affiliation: | 1. Department of Accounting Information, Kun Shan University, No. 949, Da Wan Road, Yung-Kang City, Tainan Hsien 710, Taiwan, ROC;2. Department of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan, Taiwan, ROC;1. State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China;2. Department of Applied Mechanics and Engineering, Sun Yat-sen University, Guangzhou 510275, China;1. Duke University, Department of Mechanical Engineering and Materials Science, Durham, NC 27708-0300, USA;2. Université de Toulouse, INSA, 135, Avenue de Rangueil, 31077 Toulouse, France |
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| Abstract: | The Large Eddy Simulation (LES) and SIMPLE-C method coupled with preconditioned conjugate gradient methods have been employed to study the effect of aiding/opposing buoyancy on the turbulent flow field and heat transfer across a square cylinder in a vertical channel. The level of wall-confinement (blockage ratio of 10%, 30% and 50%) was changed with a constant Reynolds number (5000) under various Richardson numbers (−1 to 1). With increasing blockage ratio, the buoyancy effect is becoming weaker on the Nusselt number for the square cylinder. The turbulent heat transfer past the square cylinder can be improved by increasing the blockage ratio. |
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