Prediction of evaporation heat transfer coefficient based on gas–liquid two-phase annular flow regime in horizontal microfin tubes |
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| Authors: | Yueshe Wang Yanling Wang G.-X. Wang Hiroshi Honda |
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| Affiliation: | 1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. Mechanical Engineering Department, The University of Akron, Akron, OH 44325-3903, USA;3. Kyushu University, 337 Kasuya-machi, Kasuya-gun, Kukuoka 811-2307, Japan;1. University of Liege, Gembloux Agro-Bio Tech, Gembloux 5030, Belgium;2. von Karman Institute, Environmental and Applied Fluid Dynamics Department, Rhode-Saint-Genèse 1640, Belgium;1. Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, P.R. China;2. Department of Chemical Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, P.R. China;1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Mechanical Science and Engineering, University of Illinois, Urbana, IL, USA;1. Department of Mechanical and Material Engineering, Florida International University, 10555 W. Flagler St., EC 3445, Miami, FL 33174, United States;2. Gas Technology Institute, Des Plaines, IL 60018, United States;1. School of Chemical Machinery, Dalian University of Technology, Dalian, Liaoning 116024, PR China;2. School of Civil and Safety Engineering, Dalian Jiaotong University, Dalian, Liaoning 116028, PR China |
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| Abstract: | A physical model of gas–liquid two-phase annular flow regime is presented for predicting the enhanced evaporation heat transfer characteristics in horizontal microfin tubes. The model is based on the equivalence of a periodical distortion of the disturbance wave in the substrate layer. Corresponding to the stratified flow model proposed previously by authors, the dimensionless quantity Fr0 = G/[gdeρv(ρl ? ρv)]0.5 may be used as a measure for determining the applicability of the present theoretical model, which was used to restrict the transition boundary between the stratified-wavy flow and the annular/intermittent flows. Comparison of the prediction of the circumferential average heat transfer coefficient with available experimental data for four tubes and three refrigerants reveals that a good agreement is obtained or the trend is better than that of the previously developed stratified flow model for Fr0 > 4.0 as long as the partial dry out of tube does not occur. Obviously, the developed annular model is applicable and reliable for evaporation in horizontal microfin tubes under the case of high heat flux and high mass flux. |
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