Two-Phase Flow Development of R134a in a Horizontal Pipe: Computational Investigation
Article
Article Title | Two-Phase Flow Development of R134a in a Horizontal Pipe: Computational Investigation |
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ERA Journal ID | 122827 |
Article Category | Article |
Authors | Mahmood, Raid A. (Author), Saleh, Khalid (Author), Musa, Veyan A. (Author), Massoud, Enass (Author), Sharifian-Barforoush, Ahmad (Author) and Abdulkareem, Lokman A. (Author) |
Journal Title | International Journal of Heat and Technology (Calore e Tecnologia) |
Journal Citation | 39 (5), pp. 1532-1540 |
Number of Pages | 9 |
Year | 2021 |
Place of Publication | Canada |
ISSN | 0392-8764 |
Digital Object Identifier (DOI) | https://doi.org/10.18280/ijht.390515 |
Web Address (URL) | https://www.iieta.org/journals/ijht/paper/10.18280/ijht.390515 |
Abstract | To improve the performance of vapor compression refrigeration systems that use vertical gravitational flash tank separators, the liquid separation efficiency of the vertical gravitational flash tank separator requires to be approved. To approach this improvement, the two-phase flow development and its behavior after the expansion device need to be investigated and predicted. For thus, this paper presents a three-dimensional computational investigation of the two-phase flow development of R134a after the expansion device in a horizontal pipe. Computational Fluid Dynamic (CFD) was used to predict the two-phase development and its behavior in the horizontal pipe. ANSYS 16.2 program was used to generates the geometry of the three-dimensional horizontal pipe of 2 meters long and 25 mm inner diameter. The hexahedral mesh was generated and it is assessed to obtain the optimum mesh size and number. Eulerian-Eulerian two-phase model was used with k-epsilon turbulence model. R134a was used as a working fluid in the horizontal pipe utilizing four different inlet diameters: 12, 12.5, 25, and 50.0 mm. Mass flux and vapor quality have been changed from 288 to 447 kg/m(2) .s and from 10 to 20% respectively. Results were validated against experimental results from the literature and revealed that the separation region length is affected by the initial phase velocities, inlet vapor quality, and inlet tube diameter. An empirical correlation to predict the expansion region length is proposed as a function of Froude, Webber, and Lockhart-Martinelli numbers. |
Keywords | two-phase flow; R134a; computational fluid dynamic; expansion length; two-phase flow development; flow in a horizontal pipe |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 401706. Numerical modelling and mechanical characterisation |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Mechanical and Electrical Engineering |
University of Zakho, Iraq | |
Arab Academy for Science, Technology and Maritime Transport, Egypt | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6y20/two-phase-flow-development-of-r134a-in-a-horizontal-pipe-computational-investigation
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