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Experimental study of the effect of winglet location on heat transfer enhancement and pressure drop in fin-tube heat exchangers
Affiliation:1. Department of Mechanical Engineering, Urmia University, Orumiyeh, 0441, Iran;2. Department of Mechanical Engineering, IIT Delhi, New Delhi 110016, India;1. MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China;2. Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA;1. Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan;2. Center for Numerical Simulation Software in Engineering and Sciences, College of Mechanics and Materials, Hohai University, Nanjing, Jiangsu 210098, China;3. Department of Systems Engineering and Naval Architecture, National Taiwan Ocean University, Keelung 202, Taiwan;1. Department of Mechanical Engineering, Khalifa University of Science and Technology, Sas Al Nakhal Campus, Abu Dhabi, United Arab Emirates;2. Department of Mechanical Engineering, Khalifa University of Science and Technology, Sas Al Nakhal Campus, P.O. Box 2533, Abu Dhabi, United Arab Emirates;3. Department of Industrial and Systems Engineering, Khalifa University of Science and Technology, Sas Al Nakhal Campus, P.O. Box 2533, Abu Dhabi, United Arab Emirates;1. School of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, PR China
Abstract:Local heat transfer coefficients were measured on fin-tube heat exchanger with winglets using a single heater of 2 inch diameter and five different positions of winglet type vortex generators. The measurements were made at Reynolds number about 2250. Flow losses were determined by measuring the static pressure drop in the system. Results showed a substantial increase in the heat transfer with winglet type vortex generators. It has been observed that average Nusselt number increases by about 46% while the local heat transfer coefficient improves by several times as compared to plain fin-tube heat exchanger. The maximum improvement is observed in the re-circulation zone. The best location of the winglets was with ΔX = 0.5D and ΔY = 0.5D. The increase in pressure drop for the existing situation was of the order of 18%.
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