Performance evaluation of a model thermocompressor using computational fluid dynamics

Ariafar, Kavous (2012) Performance evaluation of a model thermocompressor using computational fluid dynamics. International Journal of Mechanics, 6 (1). pp. 35-42. ISSN 1998-4448

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Abstract

Thermocompressors are widely used in a large number of industries that use steam as their heating medium or as a power generating utility. They are devices that use the energy of a high pressure fluid to move a low pressure fluid and enable it to be compressed to a higher pressure according to the principle of energy conversion. They work like a vacuum pump but without usage of any moving part and so they can save energy. The performance of a thermocompressor highly depends on its geometry and operating conditions. This paper first describes the flow behavior within a designed model of a thermocompressor using the computational fluid dynamics code, FLUENT. Since the flow is turbulent and supersonic, CFD is an efficient tool to reveal the phenomena and mixing process at different part of the thermocompressor which are not simply obtained through an experimental work. Then its performance is analyzed by choosing different operating conditions at the boundaries and also different area ratios which is one of the significant geometrical factors to describe the thermocompressor performance. Finally, the effect of various nozzle exit plane diameters which cause different Mach numbers at the nozzle exit is investigated on the thermocompressor performance. The results indicate that these variables can affect both the entrainment ratio and critical back pressure. This device uses water vapor as the working fluid and operates at 7.5 bar motive pressure, 63°C and 80°C for suction and discharge temperatures, respectively.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2012 North Atlantic University Union. This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 14 Aug 2014 23:21
Last Modified: 02 Feb 2017 05:06
Uncontrolled Keywords: CFD; converging-diverging nozzle; ejector; entrainment ratio; performance evaluation; thermocompressor
Fields of Research : 02 Physical Sciences > 0203 Classical Physics > 020303 Fluid Physics
09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
09 Engineering > 0915 Interdisciplinary Engineering > 091501 Computational Fluid Dynamics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/25758

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