Heat Transfer and Flow Characteristics Predictions with a Refined k-ε-f_u Turbulent Model in Impinging Jet 被引量：1

Heat Transfer and Flow Characteristics Predictions with a Refined k-ε-f_u Turbulent Model in Impinging Jet

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摘要 Local heat transfer and flow characteristics in a round turbulent impinging jet for Re≈23 000 is predicted numerically with the RANS approach and a k-ε-fu turbulence model. The heat transfer predictions and turbulence parameters are verified against the axis-symmetric free jet impingement measurements and compared with previous other turbulence models, and results show the k-ε-fu model has a good performance in predictions of the local wall heat transfer coefficient, and in agreement with measurements in mean velocity profiles at different radial positions as well. The numerical model is further used to examine the effect of the fully confined impingement jet on the local Nusselt number. Local Nusselt profiles in x and y-centerlines for the target plate over three separation distances are predicted. Compared with the experimental data, the numerical results are accurate in the central domain around the stagnation region and present a consistent structure distribution. Local heat transfer and flow characteristics in a round turbulent impinging jet for Re≈23 000 is predicted numerically with the RANS approach and a k-ε-f_u turbulence model. The heat transfer predictions and turbulence parameters are verified against the axis-symmetric free jet impingement measurements and compared with previous other turbulence models, and results show the k-ε-f_u model has a good performance in predictions of the local wall heat transfer coefficient, and in agreement with measurements in mean velocity profiles at different radial positions as well. The numerical model is further used to examine the effect of the fully confined impingement jet on the local Nusselt number. Local Nusselt profiles in x and y-centerlines for the target plate over three separation distances are predicted. Compared with the experimental data, the numerical results are accurate in the central domain around the stagnation region and present a consistent structure distribution.

作者 Qinglin Niu Biao Chen Zhihong He Jianfei Tong Shikui Dong

机构地区 Key Laboratory of Aerospace Thermophysics Dongguan Branch

出处《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2019年第4期9-17,共9页 哈尔滨工业大学学报（英文版）

基金 Sponsored by the National Natural Science Foundation of China(Grant No.51576054)

关键词 HEAT TRANSFER IMPINGEMENT flow k-ε-fu TURBULENCE model Nusselt NUMBER heat transfer impingement flow k-ε-f_u turbulence model Nusselt number

分类号 TK124 [动力工程及工程热物理—工程热物理]

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