Numerical investigation of EHD effects on heat transfer enhancement and flow pattern of R-134a two phase flow |
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| Institution: | 1. Department of Mechanical Engineering, Babol University of Technology, Babol, Iran;2. Department of Mathematics, Quaid-I-Azam University 45320, Islamabad 44000, Pakistan;3. Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;4. Centre for Differential Equations, Continuum Mechanics and Applications, School of Computational and Applied Mathematics, University of the Witwatersrand, Johannesburg, Private Bag 3, Wits 2050, South Africa;1. Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran;2. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;1. United Technologies Research Center, East Hartford, CT 06118, USA;2. Two-Phase Flow and Heat Transfer Enhancement Laboratory, Mechanical, Materials and Aerospace Engineering Department, Illinois Institute of Technology, Chicago, IL 60616, USA;1. Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China;2. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China;3. Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan |
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| Abstract: | In this paper the effects of electrohydrodynamics (EHD) on heat transfer enhancement and flow pattern of R134a two-phase mixture, flowing in a horizontal tube, were numerically investigated. A uniform DC electric field was applied through a circular stainless steel rod along the centerline of tube, while the tube was considered as a grounded electrode. The simulations, in order to investigate the EHD mechanism, were performed for a constant heat flux 2000 W/m2, voltages between 0 and 5 kV, inlet volume fractions 65% and 85%, mass fluxes from 30 kg/m2s to 50 kg/m2s and electrode diameters between 1.57 mm and 2.4 mm. These flow conditions correspond to stratified flow. The flow regime redistributions under the applied electric field was obtained. The results show that the steady state condition was occurred at the time about 900 ms. According to the results, enhancement ratio is directly proportional to voltage, and it is reversely proportional to electrode diameter, mass flux and inlet volume fraction. |
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| Keywords: | Electrohydrodynamics Numerical investigation Heat transfer enhancement Two phase flow |
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