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• W2912144985 endingPage "1072" @default.
• W2912144985 startingPage "1061" @default.
• W2912144985 abstract "Quenching heat transfer is of fundamental interest in cryogenic chilldown applications. Surface configuration can improve quenching heat transfer and clear understanding of the effect of different surface characteristics is necessary. In the present study, the effect of anodic aluminum oxide (AAO) surface on pool quenching is investigated. The AAO surface and other four types of surfaces are quenched in liquid nitrogen and a theoretical model is applied to further investigate the effect of surface thermal resistance. It is shown that the total chilldown time is decreased from 63.8 s on electropolishing surface to 33.4 s on the AAO surface. By comparisons with other surfaces, it is found that the effect of the AAO surface results from two aspects: surface thermal resistance and nanopore structure. For surface thermal resistance, it is indicated by the consistence of numerical and experimental results that the end of film boiling is resulted from the decrease of local surface temperature that is not high enough to sustain the local vapor film, even though the bulk temperature is still high. For the nanopore structure, it is theoretically estimated that the nanopores will be kept filled with vapor at the surface temperature higher than the critical pinning state temperature (94.4 K). This phenomenon of vapor-filled nanopores reduces the liquid–solid contact area and local vapor generation rate, resulting in a higher temperature of the Leidenfrost point (LFP) and lower heat flux in partial nucleate boiling regime. When the surface temperature drops below the critical pinning state temperature, liquid nitrogen infiltrates into the nanopores and a heat flux jump appears." @default.
• W2912144985 created "2019-02-21" @default.
• W2912144985 creator A5014683157 @default.
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• W2912144985 date "2019-05-01" @default.
• W2912144985 modified "2023-09-27" @default.
• W2912144985 title "Cryogenic quenching enhancement of a nanoporous surface" @default.
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• W2912144985 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2019.01.081" @default.
• W2912144985 hasPublicationYear "2019" @default.
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