Biologically inspired porous cooling membrane using arrayed-droplets evaporation

T. Kokalj, H. Cho, M. Jenko, L. P. Lee

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28 Scopus citations


Inspired by human skin that dissipates heat via sweat-droplet evaporation on the skin, we propose an evaporative cooling technique via arrayed-droplets on a porous membrane, construct an analytical model of the evaporative cooling including interactions among the large number of droplets, and extensively analyze the cooling performance of 1000-droplet array. Our model shows that heat dissipation is enhanced by the membrane with dense droplets (i.e., enhancement factor of 10 at 5000 pores/ cm 2 and pore radius of 35μm with respect to human skin). Additionally, the model predicts that the membrane dissipates heat more efficiently by operating at a higher temperature (i.e., additional enhancement factor of 17 at droplet temperature of 100°C).

Original languageEnglish
Article number163703
JournalApplied Physics Letters
Issue number16
StatePublished - 19 Apr 2010

Bibliographical note

Funding Information:
This work is supported by grant from Slovenian Research Agency (Project No. P2-0132) (T.K.). We are grateful to Martin Horvat, Gregor Kosec, Marko Žnidarič, Benjamin Ross, and Audrey Kimteng for expert assistance and discussions. Two of the authors T.K. and H.C. contributed equally to this work.


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