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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Effects of Evaporation and Condensation on Apparent Thermal Slip

Marc Hodes
Tufts University, 200 College Ave., Medford, MA 02138

Lisa Steigerwalt Lam
Department of Mechanical Engineering, Tufts University, Medford, MA, 02155

Scott MacLachlan
Tufts University, Department of Mechanical Engineering; Department of Mathematics and Statistic, Memorial University of Newfoundland, St. John’s, NL, Canada, A1C 5S7

Ryan Enright
Bell Labs Ireland, Alcatel-Lucent Ireland Ltd.

DOI: 10.1615/IHTC15.fcv.009280
pages 3075-3088


KEY WORDS: Convection, Nano/Micro scale measurement and simulation, apparent slip

Abstract

We capture the effects of evaporation and condensation at menisci on apparent thermal slip lengths for liquids suspended in the Cassie state on ridge-type structured surfaces. Isoflux or isothermal boundary conditions are prescribed at solid-liquid interfaces. Constant heat transfer coefficient or isothermal ones are imposed at menisci. We assume that the gaps between ridges, where the vapor phase resides, are closed systems; therefore, the net rate of heat transfer across menisci is zero. The reduction in apparent thermal slip length due to evaporation and condensation relative to the limiting case of an adiabatic meniscus is quantified.

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