Two phase thermosyphon for high heat flux cooling application

Thermosyphons are a promising option for cooling high heat dissipating electronics because of their high effectiveness. At its simplest, a two-phase closed thermosyphon consists of an evaporator, a condenser and a heating base. Various parameters affect the heat transfer performance of thermosyphons...

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Main Author: Lee, Kai An.
Other Authors: Leong Kai Choong
Format: Final Year Project
Language:English
Published: 2009
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Online Access:http://hdl.handle.net/10356/15728
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-157282023-03-04T19:01:26Z Two phase thermosyphon for high heat flux cooling application Lee, Kai An. Leong Kai Choong School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering Thermosyphons are a promising option for cooling high heat dissipating electronics because of their high effectiveness. At its simplest, a two-phase closed thermosyphon consists of an evaporator, a condenser and a heating base. Various parameters affect the heat transfer performance of thermosyphons. In this project, the effect of four parameters: fluid level, working fluid, graphite foam type and geometrical structure was investigated experimentally. The fluid fill levels investigated are 1.5 cm, 3.0 cm and 4.5 cm above the graphite foam surface. FC-72 and HFE-7000 were used as the working fluids. The graphite foams used in this study are POCO Graphite Foam and Koppers Foam (Kfoam). The geometrical structures of the foams are block and fin configuration. A series of experiments was carried out to study the influence of the above parameters on the steady-state heat transfer characteristics of a two-phase closed thermosyphon. The results showed that the fluid level has a significant effect on the heat transfer performance of the system but not on heater wall temperature. The working fluid has a significant effect on the heat transfer performance and wall temperature. FC-72 displayed better heat transfer performance on POCO foam but not on Kfoam. HFE-7000 resulted in a lower wall temperature than FC-72. In addition, the boiling phenomenon was found to be surface tension dominated. The type of graphite foam used has an effect on heat transfer performance. POCO Foam showed much better heat transfer performance than Kfoam only when FC-72 was used. The graphite foam geometry has a significant effect on heat transfer performance. Fin structure graphite foam performed better than block structure graphite foam. Bachelor of Engineering (Mechanical Engineering) 2009-05-14T03:20:24Z 2009-05-14T03:20:24Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/15728 en Nanyang Technological University 92 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering
spellingShingle DRNTU::Engineering::Mechanical engineering
Lee, Kai An.
Two phase thermosyphon for high heat flux cooling application
description Thermosyphons are a promising option for cooling high heat dissipating electronics because of their high effectiveness. At its simplest, a two-phase closed thermosyphon consists of an evaporator, a condenser and a heating base. Various parameters affect the heat transfer performance of thermosyphons. In this project, the effect of four parameters: fluid level, working fluid, graphite foam type and geometrical structure was investigated experimentally. The fluid fill levels investigated are 1.5 cm, 3.0 cm and 4.5 cm above the graphite foam surface. FC-72 and HFE-7000 were used as the working fluids. The graphite foams used in this study are POCO Graphite Foam and Koppers Foam (Kfoam). The geometrical structures of the foams are block and fin configuration. A series of experiments was carried out to study the influence of the above parameters on the steady-state heat transfer characteristics of a two-phase closed thermosyphon. The results showed that the fluid level has a significant effect on the heat transfer performance of the system but not on heater wall temperature. The working fluid has a significant effect on the heat transfer performance and wall temperature. FC-72 displayed better heat transfer performance on POCO foam but not on Kfoam. HFE-7000 resulted in a lower wall temperature than FC-72. In addition, the boiling phenomenon was found to be surface tension dominated. The type of graphite foam used has an effect on heat transfer performance. POCO Foam showed much better heat transfer performance than Kfoam only when FC-72 was used. The graphite foam geometry has a significant effect on heat transfer performance. Fin structure graphite foam performed better than block structure graphite foam.
author2 Leong Kai Choong
author_facet Leong Kai Choong
Lee, Kai An.
format Final Year Project
author Lee, Kai An.
author_sort Lee, Kai An.
title Two phase thermosyphon for high heat flux cooling application
title_short Two phase thermosyphon for high heat flux cooling application
title_full Two phase thermosyphon for high heat flux cooling application
title_fullStr Two phase thermosyphon for high heat flux cooling application
title_full_unstemmed Two phase thermosyphon for high heat flux cooling application
title_sort two phase thermosyphon for high heat flux cooling application
publishDate 2009
url http://hdl.handle.net/10356/15728
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