TY - JOUR
T1 - Effect of nano-textured heater surfaces on evaporation at a single meniscus
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).
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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U2 - 10.1016/j.ijheatmasstransfer.2017.01.079
DO - 10.1016/j.ijheatmasstransfer.2017.01.079
M3 - Article
AN - SCOPUS:85011102721
VL - 108
SP - 2444
EP - 2450
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
ER -