Increasing heat transfer during condensation on surfaces via lubricant impregnation

Sushant Anand, Adam Paxson, Konrad Rykaczewski, Kripa K. Varanasi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The low contact angle hysteresis shown by superhydrophobic surfaces towards water has many interesting applications including condensation. However these useful properties can be lost during condensation. Water droplets randomly nucleate anywhere on the surface including in between the surface textures and grow while still remaining entrained in the texture. By using specially crafted textures, coalescence induced self-propulsion of droplets to eject them from the surface can be achieved; however surface textures are vulnerable to damage and defects. A new approach to prevent a droplet from attaining pinned state on surfaces with nano/micro textures has recently been introduced by impregnating surfaces with a liquid immiscible with the droplet such that the Impregnating Lubricant remains trapped on the surface forming a hybrid surface of liquid and solid. This work will focus on mechanics of condensation on such lubricant impregnated surfaces. We show that lubricants despite having ultra-smooth surfaces nevertheless show significant enhancement in nucleation as compared to solid surfaces with similar surface energy. Further we discuss the mechanisms behind the increase in heat transfer during condensation on such surfaces. Longevity of lubricant is a key aspect in application of these surfaces for industrial applications such as condensers, cooling systems, heat pipes etc. We report the mechanics of lubricant loss and how such losses can be minimized for long-term usage of such surfaces.

Original languageEnglish (US)
Title of host publicationThermomechanical Phenomena in Electronic Systems -Proceedings of the Intersociety Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages535-540
Number of pages6
ISBN (Electronic)9781479952670
DOIs
StatePublished - Sep 4 2014
Event14th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2014 - Orlando, United States
Duration: May 27 2014May 30 2014

Publication series

NameThermomechanical Phenomena in Electronic Systems -Proceedings of the Intersociety Conference

Other

Other14th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2014
CountryUnited States
CityOrlando
Period5/27/145/30/14

Keywords

  • dropwise condensation
  • heat transfer
  • nanotextured surfaces
  • slippery surfaces

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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  • Cite this

    Anand, S., Paxson, A., Rykaczewski, K., & Varanasi, K. K. (2014). Increasing heat transfer during condensation on surfaces via lubricant impregnation. In Thermomechanical Phenomena in Electronic Systems -Proceedings of the Intersociety Conference (pp. 535-540). [6892327] (Thermomechanical Phenomena in Electronic Systems -Proceedings of the Intersociety Conference). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ITHERM.2014.6892327