CFD study of turbulent jet impingement on curved surface |
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Authors: | Javad Taghinia Md Mizanur Rahman Timo Siikonen |
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Affiliation: | 1.Aalto University, School of Engineering, Department of Applied Mechanics, FI-00076, Finland;2.Hong Kong University of Science and Technology, Department of Civil and Environmental Engineering, ClearWater Bay, Hong Kong, China |
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Abstract: | The heat transfer and flow characteristics of air jet impingement on a curved surface are investigated with com-putational fluid dynamics (CFD) approach. The first applied model is a one-equation SGS model for large eddy simulation (LES) and the second one is the SST-SAS hybrid RANS-LES. These models are utilized to study the flow physics in impinging process on a curved surface for different jet-to-surface (h/B) distances at two Reynolds numbers namely, 2960 and 4740 based on the jet exit velocity (Ue) and the hydraulic diameter (2B). The predic-tions are compared with the experimental data in the literature and also the results from RANS k-εmodel. Com-parisons show that both models can produce relatively good results. However, one-equation model (OEM) produced more accurate results especial y at impingement region at lower jet-to-surface distances. In terms of heat transfer, the OEM also predicted better at different jet-to-surface spacings. It is also observed that both models show similar performance at higher h/B ratios. |
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Keywords: | Jet impingement Curved surface RAST one-equation model Large eddy simulation Heat transfer |
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