CFD numerical and experimental investigation of two-phase flow development after an expansion device in a horizontal pipe

Mahmood, Raid Ahmed and Buttsworth, David and Malpress, Ray and Sharifian-Barforoush, Ahmed (2021) CFD numerical and experimental investigation of two-phase flow development after an expansion device in a horizontal pipe. Journal of Thermal Engineering, 7 (1). 307- 323.

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Abstract

To optimize a vertical flash tank separator, the characteristics of the flow entering the separator are
required to be known. A flash tank separator improves the performance of a refrigeration cycle by separating the
liquid from liquid-gas flow and providing the evaporator with only liquid refrigerant. This technique improves
the effective area and enhances the heat transfer coefficient in the evaporator. This paper investigates the influence of the inlet operating conditions to an expansion device, on the adiabatic two-phase flow development in a
horizontal pipe downstream from the expansion device. This work also compares three dimensional numerical
simulations and experimental observations for the two-phase flow development after the expansion device in the
horizontal pipe. A general trend of the two-phase flow after the expansion device was gradually developed and
the expansion length was identified at less than 200 mm from the inlet. The two-phase flow behaviour was
recorded using a digital camera recording the flow behaviour at the upstream and downstream of the horizontal
tube. The results revealed that an increase of the mass flow rate causes an increase in the void fraction and a
reduction in the slip ratio in the developed region. The simulations underestimate the expansion length and the
mean difference between the experimental data and the numerical results is 8 %


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Journal of Thermal Engineering is licensed under a Creative Commons Attribution 4.0 International License.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Date Deposited: 06 Jan 2021 03:32
Last Modified: 06 Jan 2021 03:32
Uncontrolled Keywords: two-phase flow, two-phase flow development, CFD simulation, expansion region, flow patterns, adiabatic expansion, stratified two-phase flow
Fields of Research (2008): 09 Engineering > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4017 Mechanical engineering > 401799 Mechanical engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/39443

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