Influence of structure and wettability of porous silver surfaces on enhancing phase change heat transfer
Influence of structure and wettability of porous silver surfaces on enhancing phase change heat transfer
The influence of the surface wettability and microstructure of porous silver surface layers on heat transfer during pool boiling and the evaporation of sessile drops from these surfaces was studied. These porous films were prepared by a modified freeze casting process and the wettability was found to be strongly influenced by the mass loading of silver nanoparticles in the starting colloidal suspension. As-prepared films typically show superhydrophylic behavior, most likely due to polyvinyl alcohol (PVA) binder remaining in the structure. The removal of this PVA by a hot wash in DI water revealed the intrinsic wettability of the surfaces. Heat transfer during the nucleate stage of pool boiling was found to be most efficient on hydrophilic surfaces with high Ag loading. The evaporation of sessile droplets from hot surfaces was also favored by more hydrophilic surfaces. The long term stability of these surfaces still remain an issue.
Babu, Roshni
fe7dbe92-1f6b-44e7-94de-4321ff68284a
29 May 2018
Babu, Roshni
fe7dbe92-1f6b-44e7-94de-4321ff68284a
Babu, Roshni
(2018)
Influence of structure and wettability of porous silver surfaces on enhancing phase change heat transfer.
In Influence of Structure and Wettability of Porous Silver Surfaces on Enhancing Phase Change Heat Transfer.
(doi:10.1109/ITHERM.2018.8419651).
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Conference or Workshop Item
(Paper)
Abstract
The influence of the surface wettability and microstructure of porous silver surface layers on heat transfer during pool boiling and the evaporation of sessile drops from these surfaces was studied. These porous films were prepared by a modified freeze casting process and the wettability was found to be strongly influenced by the mass loading of silver nanoparticles in the starting colloidal suspension. As-prepared films typically show superhydrophylic behavior, most likely due to polyvinyl alcohol (PVA) binder remaining in the structure. The removal of this PVA by a hot wash in DI water revealed the intrinsic wettability of the surfaces. Heat transfer during the nucleate stage of pool boiling was found to be most efficient on hydrophilic surfaces with high Ag loading. The evaporation of sessile droplets from hot surfaces was also favored by more hydrophilic surfaces. The long term stability of these surfaces still remain an issue.
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Published date: 29 May 2018
Venue - Dates:
17th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm), San Diego, CA, United States, 2018-05-29 - 2018-06-01
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Local EPrints ID: 505728
URI: http://eprints.soton.ac.uk/id/eprint/505728
PURE UUID: 9c6a52af-1a2a-4ffa-abd0-1cc4e2db1c0b
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Date deposited: 16 Oct 2025 17:33
Last modified: 16 Oct 2025 17:33
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Author:
Roshni Babu
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