Heat transfer enhancement in a tube using delta-winglet twisted tape inserts |
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| Authors: | S Eiamsa-ard K Wongcharee P Eiamsa-ard C Thianpong |
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| Affiliation: | 1. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand;2. Department of Chemical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand;3. Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology, Ladkrabang, Bangkok 10520, Thailand;1. School of Mechanical and Civil Engineering, Shoolini University, Solan, India;2. Department of Mechanical Engineering, DIT University, Dehradun, India;1. Department of Mechanical Engineering, National Institute of Technology, Hamirpur, HP 177005, India;2. CSIR-Indian Institute of Petroleum, Dehradun, Uttarakhand 248001, India;3. Department of Mechanical Engineering, THDC Institute of Hydropower Engineering & Technology, Tehri, Uttarakhand 249124, India;4. Department of Mechanical Engineering, Gurukul Vidyapeeth, Banur, Punjab 140601, India;1. Department of Mechanical Engineering, University Campus2, University of Guilan, Rasht, Iran;2. Department of Mechanical Engineering, Yasouj University, Yasouj, Iran;3. Department of Mechanical Engineering, Islamic Azad University-Nowshahr Branch, Nowshahr, Iran;4. Department of Mechanical Engineering, Babol University of Technology, Babol, Iran;1. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand;2. Department of Chemical Engineering, Faculty of Engineering, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand |
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| Abstract: | Heat transfer, flow friction and thermal performance factor characteristics in a tube fitted with delta-winglet twisted tape, using water as working fluid are investigated experimentally. Influences of the oblique delta-winglet twisted tape (O-DWT) and straight delta-winglet twisted tape (S-DWT) arrangements are also described. The experiments are conducted using the tapes with three twist ratios (y/w = 3, 4 and 5) and three depth of wing cut ratios (DR = d/w = 0.11, 0.21 and 0.32) over a Reynolds number range of 3000–27,000 in a uniform wall heat flux tube. The obtained results show that mean Nusselt number and mean friction factor in the tube with the delta-winglet twisted tape increase with decreasing twisted ratio (y/w) and increasing depth of wing cut ratio (DR). It is also observed that the O-DWT is more effective turbulator giving higher heat transfer coefficient than the S-DWT. Over the range considered, Nusselt number, friction factor and thermal performance factor in a tube with the O-DWT are, respectively, 1.04–1.64, 1.09–1.95, and 1.05–1.13 times of those in the tube with typical twisted tape (TT). Empirical correlations for predicting Nusselt number and friction factor have been employed. The predicted data are within ±10% for Nusselt number and ±10% for friction factor. |
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