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

Sebastian Fischer; Rakesh P. Sahu; Sumit Sinha-Ray; Alexander L. Yarin; Tatiana Gambaryan-Roisman; Peter Stephan

doi:10.1016/j.ijheatmasstransfer.2017.01.079

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

Sebastian Fischer, Rakesh P. Sahu, Sumit Sinha-Ray, Alexander L. Yarin, Tatiana Gambaryan-Roisman, Peter Stephan

College of Engineering

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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.

Original language	English
Pages (from-to)	2444-2450
Number of pages	7
Journal	International Journal of Heat and Mass Transfer
Volume	108
DOIs	https://doi.org/10.1016/j.ijheatmasstransfer.2017.01.079
Publication status	Published - 2017

Keywords

Evaporation
Heat transfer
Meniscus
Nano-textured surfaces
Nanofibers

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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title = "Effect of nano-textured heater surfaces on evaporation at a single meniscus",

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.",

keywords = "Evaporation, Heat transfer, Meniscus, Nano-textured surfaces, Nanofibers",

author = "Sebastian Fischer and Sahu, {Rakesh P.} and Sumit Sinha-Ray and Yarin, {Alexander L.} and Tatiana Gambaryan-Roisman and Peter Stephan",

note = "Funding Information: S.F., T.G.-R. and P.S. acknowledge the financial support of German Science Foundation (DFG) in the framework of Collaborative Research Center TRR 75 ?Droplet dynamics under extreme ambient conditions?, subproject C2 ?High resolution measurements of heat transfer during drop impact onto heated walls taking into account the evaporating 3-phase contact line?. T.G.-R. acknowledges the financial support of EC through the Marie Curie Initial Training Network ?Complex Wetting Phenomena? (CoWet), Grant No. 607861. A.L.Y., R.P.S. and S.S.-R. acknowledge the financial support of NASA (Grant No. NNX13AQ77G). Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

doi = "10.1016/j.ijheatmasstransfer.2017.01.079",

language = "English",

volume = "108",

pages = "2444--2450",

journal = "International Journal of Heat and Mass Transfer",

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AU - Fischer, Sebastian

AU - Sahu, Rakesh P.

AU - Sinha-Ray, Sumit

AU - Yarin, Alexander L.

AU - Gambaryan-Roisman, Tatiana

AU - Stephan, Peter

N1 - Funding Information: S.F., T.G.-R. and P.S. acknowledge the financial support of German Science Foundation (DFG) in the framework of Collaborative Research Center TRR 75 ?Droplet dynamics under extreme ambient conditions?, subproject C2 ?High resolution measurements of heat transfer during drop impact onto heated walls taking into account the evaporating 3-phase contact line?. T.G.-R. acknowledges the financial support of EC through the Marie Curie Initial Training Network ?Complex Wetting Phenomena? (CoWet), Grant No. 607861. A.L.Y., R.P.S. and S.S.-R. acknowledge the financial support of NASA (Grant No. NNX13AQ77G). Publisher Copyright: © 2017 Elsevier Ltd

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

KW - Evaporation

KW - Heat transfer

KW - Meniscus

KW - Nano-textured surfaces

KW - Nanofibers

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ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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