A new model for flow boiling heat transfer coefficient inside horizontal tubes with twisted-tape inserts |
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| Affiliation: | 1. Heat Transfer Research Group, Department of Mechanical Engineering, Escola de Engenharia de São Carlos, University of São Paulo, São Carlos, São Paulo, Brazil;2. Department of Mechanical Engineering, Federal University of Technology Akure, School of Engineering and Engineering Technology, PMB 704, Ondo State, Nigeria;1. Isotherm, Inc., 7401 Commercial Blvd. E., Arlington, Texas 76001, USA;2. Natural Fluids Refrigeration Center, GIK Institute, Topi, Pakistan;3. Energy Engineering, Zhejiang University, Hangzhou, China;4. Higher College of Technology, Abu Dhabi, UAE;5. Heat Transfer Research Group, University of São Paulo, São Carlos, Brazil;1. Isotherm, Inc., Arlington, TX 76001, USA;2. Heat Transfer Research Group, Escola de Engenharia de São Carlos (EESC), University of São Paulo (USP), São Carlos, SP, Brazil;3. Petroleum Institute, Abu Dhabi, United Arab Emirates |
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| Abstract: | This paper presents a new method to predict the heat transfer coefficient during flow boiling inside horizontal tubes containing twisted tape inserts. The method was developed based on the database presented by Kanizawa et al. This database comprises flow boiling results for horizontal tubes with internal diameters of 12.7 and 15.9 mm, twisted-tape ratios of 3, 4, 9 and 14, mass velocities ranging from 75 to 200 kg m?2 s?1, heat fluxes of 5 and 10 kW m?2 and saturation temperatures of 5 and 15 °C. The method is flow-pattern based and considers flow boiling, dryout and mist flow regions. The predictive method also takes into account the physical picture of the swirl flow phenomenon by considering swirl flow effects promoted by the twisted tape insert. The proposed method provides satisfactory predictions and captures the main heat transfer trends of the data of Kanizawa et al. and also of independent data from literature. |
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