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Effect of nano-textured heater surfaces on evaporation at a single meniscus.

Fischer, Sebastian and Sahu, R. P. and Sinha-Ray, S. and Yarin, A. L. and Gambaryan-Roisman, Tatiana and Stephan, Peter (2017):
Effect of nano-textured heater surfaces on evaporation at a single meniscus.
In: International Journal of Heat and Mass Transfer, pp. 2444-2450, 108, ISSN 00179310,
[Online-Edition: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.01.079],
[Article]

Abstract

Nanofiber coatings have shown a unique potential for heat transfer enhancement during drop impact cooling, nucleate boiling and flow boiling. In order to get insights into the mechanisms of heat transfer enhancement invoked by the nanofiber coating, we investigated evaporation of liquid in the vicinity of an apparent contact line of a single meniscus, where the liquid-vapor interface meets the nano- textured substrate. The experiments have been performed for stationary, advancing and receding menisci. It has been found that the local heat flux in the vicinity of a stationary apparent contact line is increased by approximately 60% in the presence of nanofiber coating. The receding meniscus leaves behind an extended region, in which the pores within the nano-textured mat are fully or partially filled with evaporating liquid, which significantly contributes to the heat transfer enhancement. These phenomena can be attributed to very strong capillary forces acting within the porous media and retaining the cooling liquid in contact with the heater surface.

Item Type: Article
Erschienen: 2017
Creators: Fischer, Sebastian and Sahu, R. P. and Sinha-Ray, S. and Yarin, A. L. and Gambaryan-Roisman, Tatiana and Stephan, Peter
Title: Effect of nano-textured heater surfaces on evaporation at a single meniscus.
Language: English
Abstract:

Nanofiber coatings have shown a unique potential for heat transfer enhancement during drop impact cooling, nucleate boiling and flow boiling. In order to get insights into the mechanisms of heat transfer enhancement invoked by the nanofiber coating, we investigated evaporation of liquid in the vicinity of an apparent contact line of a single meniscus, where the liquid-vapor interface meets the nano- textured substrate. The experiments have been performed for stationary, advancing and receding menisci. It has been found that the local heat flux in the vicinity of a stationary apparent contact line is increased by approximately 60% in the presence of nanofiber coating. The receding meniscus leaves behind an extended region, in which the pores within the nano-textured mat are fully or partially filled with evaporating liquid, which significantly contributes to the heat transfer enhancement. These phenomena can be attributed to very strong capillary forces acting within the porous media and retaining the cooling liquid in contact with the heater surface.

Journal or Publication Title: International Journal of Heat and Mass Transfer
Volume: 108
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative
Date Deposited: 20 Feb 2017 17:25
Official URL: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.01.079
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