Nucleate pool-boiling enhancement outside a horizontal bank of twisted tubes with machined porous surface期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Nucleate pool-boiling enhancement outside a horizontal bank of twisted tubes with machined porous surface

Authors:	Xuenong Gao Huibin Yin Yuyou Huang Yutang Fang Zhengguo Zhang

Affiliation:	1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, South China University of Technology, Guangzhou 510640, China;2. Zhuhai Gree Corporation, Zhuhai 519070, China;1. Department of Thermal Engineering, V?B TU Ostrava, 17. listopadu 15, 70833 Ostrava-Poruba, Czech Republic;2. Regional Materials Science and Technology Centre, V?B TU Ostrava, 17. listopadu 15, 70833 Ostrava-Poruba, Czech Republic;3. Department of Material Forming, V?B TU Ostrava, 17. listopadu 15, 70833 Ostrava-Poruba, Czech Republic;4. Department of Hydrodynamics and Hydraulic Equipment, V?B TU Ostrava, 17. listopadu 15, 70833 Ostrava-Poruba, Czech Republic;1. The Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok, Thailand;2. 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, Thailand;1. Faculty of Mechanical Engineering, University Technology Malaysia, 81310 Skudai, Johor, Malaysia;2. Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Abstract:	Nucleate pool boiling of refrigerants is of important application in the flooded evaporator of refrigeration and air-conditioning system. Many surface geometries involve machined porous surface have been adopted to enhance the nucleate pool boiling heat transfer of refrigerants. Nucleate pool-boiling performance of R134a and R142b outside a horizontal bank of twisted tubes with machined porous surface (T-MPS tubes) was investigated in this paper. The experimental results showed that the T-MPS tube bank could enhance boiling heat transfer evidently. The enhancement ratios of R134a from the T-MPS tube bank were 1.4–1.7 and the maximum enhancement ratio of R142b could reach up to 4.4. Analyzing the tube bank effects of boiling heat transfer for R134a and R142b, the overall trend showed that the boiling heat transfer performance of the T-MPS tube bank was inferior to that of single T-MPS tube slightly.

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