Characterization of pressure-wave propagation during the condensation of R404A and R134a refrigerants in pipe mini-channels that undergo periodic hydrodynamic disturbances |
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| Institution: | 1. Mechanical Engineering Department, Royal school of Engineering & Technology, Guwahati, 781035, India;2. Mechanical Engineering Department, Assam Engineering College, Guwahati, 781013, India;1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;2. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, UNSW Australia, UNSW Sydney, NSW 2052, Australia;1. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;2. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;3. CNOOC Gas and Power Group, Beijing 100010, China;4. School of Civil Engineering, Lanzhou University of Technology, Lanzhou, China |
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| Abstract: | In the present paper, an attempt was undertaken to model the propagation of a pressure wave triggered by periodic hydrodynamic instabilities in the condensation of the R404A and R134a refrigerants in pipe mini-channels. A homogenous transient two-fluid model was used based on balance equations. The model presents the complexity of multi-phase flows. The heat exchange between the phases in the condensation process was calculated using the one-dimensional form of Fourier’s equation. The dependence which defines the interfacial the drag forces for the flow in mini-channels was also taken into consideration. The results of the numerical calculations were verified with experimental investigations and satisfactory compliance was obtained. |
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