Experimental investigation of impingement heat transfer on a flat and dimpled plate with different crossflow schemes |
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| Authors: | Yunfei Xing Bernhard Weigand |
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| Affiliation: | 1. Group of Thermal Turbomachinery (GTT), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;2. Institute of Aerospace Thermodynamics (ITLR), Universität Stuttgart, Pfaffenwaldring 31, D-70569 Stuttgart, Germany;3. Alstom, CH-5401 Baden, Switzerland;1. Parks College of Engineering, Aviation, and Technology, Saint Louis University, 3450 Lindell Boulevard, St. Louis, MO 63103, USA;2. Propulsion Research Center, Department of Mechanical and Aerospace Engineering, College of Engineering, University of Alabama in Huntsville, Technology Boulevard, Olin B. King Technology Hall S236, Huntsville, AL 35899, USA;3. Aero/Thermal & Heat Transfer, Solar Turbines, Inc., 2200 Pacific Highway, P. O. Box 85376, Mail Zone C-9, San Diego, CA 92186-5376, USA;1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China;3. Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;4. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China |
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| Abstract: | A nine-by-nine jet array impinging on a flat and dimpled plate at Reynolds numbers from 15,000 to 35,000 has been studied by the transient liquid crystal method. The distance between the impingement plate and target plate is adjusted to be 3, 4 and 5 jet diameters. Three jet-induced crossflow schemes, referred as minimum, medium and maximum crossflow correspondingly, have been measured. The local air jet temperature is measured at several positions on the impingement plate to account for an appropriate reference temperature of the heat transfer coefficient. The heat transfer results of the dimpled plate are compared with those of the flat plate. The best heat transfer performance is obtained with the minimum crossflow and narrow jet-to-plate spacing no matter on a flat or dimpled plate. The presence of dimples on the target plate produce higher heat transfer coefficients than the flat plate for maximum and minimum crossflow. |
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