Impingement of an impact jet onto a spherical cavity. Flow structure and heat transfer |
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| Authors: | VI Terekhov SV Kalinina YuM Mshvidobadze KA Sharov |
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| Affiliation: | 1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074 PR China;2. School of Civil Engineering and Architecture, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070 PR China;3. G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta 30332, USA;4. Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;1. Mechanical Engineering Department, Arab Academy for Science, Technology and Maritime Transport Abu-Quir, Alexandria, Egypt;2. Mechanical Engineering Department, Alexandria University, Alexandria, Egypt;3. Mechanical Engineering Department, Suez Canal University, Ismailia, Egypt;1. School of Mechanical and Civil Engineering, Shoolini University, Solan, India;2. Department of Mechanical Engineering, DIT University, Dehradun, India;1. School of Mechanical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan-si, Gyeongbuk, 712-749, South Korea;2. School of Mechanical Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul, 136-713, South Korea;3. Department of Mechanical Engineering, Dr. B.R. Ambedkar National Institute of Technology Jalandhar, Punjab, 144011, India;1. School of Mechanical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan-si, Gyeongbuk, 38541, South Korea;2. Department of Mechanical Engineering, Dr B R Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India |
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| Abstract: | An experimental study of flow characteristics and heat transfer for jet impingement cooling of obstacles in the form of single spherical cavities is reported. The distributions of flow velocities between the nozzle and the obstacle, and also the fields of pressure and heat-transfer coefficients inside the cavity were measured. It is found that, at a value of depth the cavity generates the large-scale toroidal vortex, essentially influencing on the heat transfer. The cavity flow becomes unstable, exhibiting low-frequency pulsations of local heat fluxes. In the examined ranges of Reynolds numbers, Re = (1.2–5.8)104, and cavity depths (equal to or smaller than 0.5Dc) the local heat-transfer intensity in the cavity is lower than that on a flat obstacle; yet, this reduction is almost fully compensated by increased area of the heat-exchanging surface. |
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