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Condensation and wetting behaviour on surfaces with micro-structures: super-hydrophobic and super-hydrophilic.

Author(s) : ZHONG Y., JACOBI A. M., GEORGIADIS J. G.

Summary

Recently it has become possible to achieve radical manipulation of surface wettability, and wettability is known to play a key role in the retention of condensate and frost melt on heat exchanger surfaces. In this paper the authors present a review of methods to produce such surfaces, and they describe a super-hydrophobic surface, with a contact angle of 148°, created in the authors' lab. The authors describe surfaces with micro-posts and micro-grooves, and the wetting behaviour of these surfaces and early growth of condensate is studied experimentally. The rapid spreading of droplets is observed for surfaces with silicon grooves and posts while an anisotropic wetting is observed for the droplets on the surface with SU8 grooves. The results of the microscopic observations show that condensate drops group around the posts on the super-hydrophobic surface, but condensate forms a thin film on the surface with silicon posts. Condensate is drawn into the grooves mainly by surface tension on the anisotropic surface.

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Details

  • Original title: Condensation and wetting behaviour on surfaces with micro-structures: super-hydrophobic and super-hydrophilic.
  • Record ID : 2007-1482
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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