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Slip effects on turbulent heat transport over post and ridge structured superhydrophobic surfaces
Published in Elsevier Ltd
2018
Volume: 122
   
Pages: 31 - 44
Abstract
Forced convection and turbulent scalar transport over a structured superhydrophobic walls composed of periodic arrays of square posts and ridges textures are numerically investigated in a periodic channel. The flow physics and thermal transport within the fluid are studied using Direct numerical simulation (DNS), assuming the plastrons are flat. Slip velocities, Nusselt number, turbulent Prandtl number and turbulent heat fluxes are determined for both square posts and streamwise ridge shaped feature geometry configurations at a friction Reynolds number of Reτ=180. This article provides an insight that superhydrophobic surfaces enhance turbulent heat fluxes and thermal fluctuations in the laminar-sublayer region. With increasing feature wavelength, the turbulent heat fluxes in the buffer layer and outer layer drop for both square posts and streamwise ridges. When compared with a smooth no-slip channel, the diffusion term in the budget of thermal fluxes pointed to the role of organized lateral flow motions in enhancing wall-normal heat-flux, and a reduction in large scale transport of streamwise heat fluxes by near-wall coherent structures. © 2018 Elsevier Ltd
About the journal
JournalData powered by TypesetInternational Journal of Heat and Mass Transfer
PublisherData powered by TypesetElsevier Ltd
ISSN00179310
Open AccessNo
Concepts (17)
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    Budget control
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    Heat flux
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    Heat transfer
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    Hydrophobicity
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    Prandtl number
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    Reynolds number
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    Surface properties
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    Turbulent flow
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    LARGE-SCALE TRANSPORT
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    Super-hydrophobic surfaces
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    THERMAL STREAKS
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    Turbulent heat fluxes
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    Turbulent heat transfer
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    TURBULENT HEAT TRANSPORT
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    Turbulent prandtl number
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    WALL-NORMAL HEAT FLUX
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    Transport properties