Heat transfer correlation for hexagonal and in-line arrays of impinging jets |
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| Authors: | LFG Geers MJ Tummers TJ Bueninck K Hanjali? |
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| Affiliation: | 1. TNO Science and Industry - Industrial Modelling and Control, P.O. Box 155, 2600 AD Delft, The Netherlands;2. Delft University of Technology - Faculty of Applied Sciences, P.O. Box 5046, 2600 GA Delft, The Netherlands;1. LaSIE, University of La Rochelle, Pôle Sciences et Technologie, Avenue Michel Crépeau, 17042 La Rochelle, France;2. CAMBI, Technical University of Civil Engineering in Bucharest, Building Services Department, 66 Avenue Pache Protopopescu, 020396 Bucharest, Romania;3. Research Unit: Metrology and Energetic Systems (UR11ES59), ENIM, University of Monastir, Tunisia;1. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 1439955961, Iran;2. Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;3. Department of Mechanical Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States;1. School of Mechanical Engineering, Micro/Nano Science and Technology Center, Jiangsu University, Zhenjiang 212013, China;2. School of Mechanical Engineering, Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering, Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology, Changzhou University, Changzhou 213164, China;1. College of Energy and Power Engineering, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China;3. Engineering Simulation and Aerospace Computing (ESAC), School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China |
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| Abstract: | The paper reports on the results of heat transfer measurements in hexagonal and in-line arrays of impinging jets for Reynolds numbers (based on the nozzle diameter Dm) ranging from 5 × 103 to 2 × 104. Liquid crystal thermography (LCT) was used to determine the temperature distribution on the flat impingement plate. The distance between the impingement plate and the nozzle exit plane varied between 3Dm and 10Dm, while the spacing between the nozzles varied between 2Dm and 6Dm. The experiments indicate that the multiple-jet heat transfer is strongly influenced by jet interactions, which, in turn, depend on the parameters mentioned above. The data set was used to construct a new correlation for the (area-averaged) Nusselt number that takes the interactions into account. |
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