Condensation heat transfer and pressure drop in flattened microfin tubes having different aspect ratios |
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| Affiliation: | 1. Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;2. Department of Energy Sciences, Lund University, Box 118, Lund SE-22100, Sweden;3. State University of New York College at Buffalo, 1300 Elmwood Avenue, Buffalo, NY 14222, USA;4. State Key Laboratory of Multiphase Flow in Power Engineering of Xi’an Jiaotong University, 710049, China;5. Mechanical Engineering Department, University of Minnesota, 111 Church St. S.E., Minneapolis, MN 55455, USA;1. Department of Mechanical Engineering, Dhaka University of Engineering & Technology, Gazipur, Bangladesh;2. Department of Mechanical Engineering, Saga University, Saga shi 840-8502, Japan;1. Department of Mechanical Engineering, Faculty of Engineering, Thaksin University, Phattalung 93210, Thailand;2. Department of Physics, Faculty of Science, Thaksin University, Phattalung 93210, Thailand;3. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand |
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| Abstract: | In this study, condensation heat transfer coefficients and pressure drops of R-410A are obtained in flattened microfin tubes made from 7.0 mm O.D. round microfin tubes. The test range covers saturation temperature 45 °C, mass flux 100–400 kg m−2 s−1 and quality 0.2–0.8. Results show that the effect of aspect ratio on condensation heat transfer coefficient is dependent on the flow pattern. For annular flow, the heat transfer coefficient increases as aspect ratio increases. For stratified flow, however, the heat transfer coefficient decreases as aspect ratio increases. The pressure drop always increases as aspect ratio increases. Possible reasoning is provided based on the estimated flow pattern in flat microfin tubes. Comparison with existing round microfin tube correlations is made. |
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| Keywords: | Condensation Heat transfer coefficient Pressure drop Microfin Tube R410A Condensation Coefficient de transfert de chaleur Chute de pression Micro ailettes Tube R410A |
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