Heat transfer and pressure drop in rectangular channel with compound roughness of V-shaped ribs and deepened scales |
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| Authors: | S.W. Chang T.-M. Liou K.F. Chiang G.F. Hong |
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| Affiliation: | 1. Thermal Fluids Laboratory, Department of Marine Engineering, National Kaohsiung Marine University, No. 142, Haijhuan Rd., Nanzih District, Kaohsiung 811, Taiwan, ROC;2. Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC;3. Department of Research and Development, Asia Vital Components Co., Ltd., 7F-3, No. 24, Wu-Chuan 2Rd., Hsin Chuang City, Taipei, Taiwan, ROC;4. Department of Marine Engineering, National Kaohsiung Marine University, Taiwan, ROC;1. Department of Mechanical Engineering, Aligoudarz Branch, Islamic Azad University, Aligoudarz, Iran;2. Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;3. Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran;4. Department of Civil and Environmental Engineering, University of Louisville, Louisville, KY 40208, USA;5. Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran;1. Key Laboratory of Solar Energy Science and Technology in Jiangsu Province, Southeast University, No. 2 Si Pai Lou, Nanjing, 210096, PR China;2. Energy Storage Research Center, Southeast University, No. 2 Si Pai Lou, Nanjing, 210096, PR China;3. School of Science, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland;1. Mechanical Engineering Department, Shoolini University, Solan 173229, Himachal Pradesh, India;2. Alternate Hydro Energy Centre, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India;3. Mechanical & Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India |
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| Abstract: | A novel heat transfer enhancement (HTE) roughness with V-shaped ribs and deepened scales is devised. Performances of heat transfer and pressure drop in a rectangular channel fitted with such HTE surfaces are experimentally examined for both forward and backward flows in the Re range of 1000–30000. Relative to the smooth-walled pipe flow conditions, HTE ratios for the present test channel with forward and backward flows, respectively, reach 9.5–13.6 and 9–12.3 for laminar flows and 6.8–6.3 and 5.7–4.3 for turbulent flows. Comparisons of heat transfer data, pressure-drop measurements and thermal performance factors with previous results collected from varieties of HTE devices demonstrate the superiorities of this compound HTE device. The decrease of HTE ratio as Re increases for turbulent flows, which is a common setback for several HTE elements, is almost diminished in the channel fitted with present compound HTE surfaces. Experimental correlations of heat transfer and friction coefficient for the tested channel with forward and backward flows are derived for design applications. |
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