Applications of pool boiling heat transfer on modulated surfaces in organic liquids
Applications of pool boiling heat transfer on modulated surfaces in organic liquids
A maximum heat flux of almost 270 W/cm2 with respect to the total base area was managed using three porous sintered coated plate fins originally micromachined onto a solid circular base of 1 cm2. This surface along with a selection of other plate and pin fins assays were all tested using a pool boiling setup, with methanol selected as the working liquid at atmospheric conditions. The potential of sintered coated porous fins was compared to completely porous fins, which were found to offer low heat transfer coefficients because of the poor conductivity through the porous structure, while the width of the porous fins may have caused some restriction to the vapour escape when approaching boiling crisis. Any benefits from capillary assisted liquid return to the heat surface, normally an attention for choosing to boil with porous surfaces, were overshadowed and the surface reached boiling crisis at a moderate CHF value but at the highest surface temperature.
Porous sintered coated fins were established as the compromise for retaining good heat conduction through the solid fins, with some extra capillary assisted liquid feed provided by the coating. The addition of the coated boosted the heat transfer coefficient particularly at low heat fluxes. The novelty of these types of surfaces remains in the techniques used to coat the solid fins, the extensive work on a number of coated plate fin configurations and the addition of porous caps to the plate fins tips in order to extend the CHF, by separating the pathways of the liquid returning to and the vapour leaving the heated surface. The future applications of this work are aimed at integrating these new evaporating surfaces into a heat pipe. The potential for near room temperature cooling, using these novel surfaces with liquids like methanol and pentane at moderate pressures can already solve many cooling problems, particularly those facing the microelectronics industry today.
University of Southampton
2006
Bailey, Wendell O. S
(2006)
Applications of pool boiling heat transfer on modulated surfaces in organic liquids.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
A maximum heat flux of almost 270 W/cm2 with respect to the total base area was managed using three porous sintered coated plate fins originally micromachined onto a solid circular base of 1 cm2. This surface along with a selection of other plate and pin fins assays were all tested using a pool boiling setup, with methanol selected as the working liquid at atmospheric conditions. The potential of sintered coated porous fins was compared to completely porous fins, which were found to offer low heat transfer coefficients because of the poor conductivity through the porous structure, while the width of the porous fins may have caused some restriction to the vapour escape when approaching boiling crisis. Any benefits from capillary assisted liquid return to the heat surface, normally an attention for choosing to boil with porous surfaces, were overshadowed and the surface reached boiling crisis at a moderate CHF value but at the highest surface temperature.
Porous sintered coated fins were established as the compromise for retaining good heat conduction through the solid fins, with some extra capillary assisted liquid feed provided by the coating. The addition of the coated boosted the heat transfer coefficient particularly at low heat fluxes. The novelty of these types of surfaces remains in the techniques used to coat the solid fins, the extensive work on a number of coated plate fin configurations and the addition of porous caps to the plate fins tips in order to extend the CHF, by separating the pathways of the liquid returning to and the vapour leaving the heated surface. The future applications of this work are aimed at integrating these new evaporating surfaces into a heat pipe. The potential for near room temperature cooling, using these novel surfaces with liquids like methanol and pentane at moderate pressures can already solve many cooling problems, particularly those facing the microelectronics industry today.
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Published date: 2006
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Local EPrints ID: 466098
URI: http://eprints.soton.ac.uk/id/eprint/466098
PURE UUID: 95439511-0a59-40d3-bb4c-ddb59afdd956
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Date deposited: 05 Jul 2022 04:20
Last modified: 05 Jul 2022 04:20
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Author:
Wendell O. S Bailey
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