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Author:

Gou, Yunjun (Gou, Yunjun.) | Liu, Zhongliang (Liu, Zhongliang.) (Scholars:刘中良) | Wang, Jieteng (Wang, Jieteng.) | Cheng, Shuiyuan (Cheng, Shuiyuan.) (Scholars:程水源)

Indexed by:

EI Scopus

Abstract:

A bionic super-hydrophobic surface has a multiple micro-nano-binary structure (MNBS) similar to the lotus leaf surface microstructure. This kind of surface has a contact angle of water greater than 150 and a roll angle smaller than 5. In this paper, the frost deposition phenomena on a bionic super-hydrophobic surface were observed. The surface has many micro bumps and its contact angle is 162. The formation of water droplets, the droplet freezing process, the formation of initial frost crystals and the frost layer structure on a cold bionic super-hydrophobic surface under natural convection conditions were closely observed. The frost layer structure formed on the super-hydrophobic surface shows remarkable differences to that on a plain copper surface: the structure is weaker, looser, thin, and easily removed and most importantly, it is of a very special pattern, a pattern similar to a chrysanthemum, a frost layer structure that has not been reported before to the best of the present authors knowledge. The experimental results also show that a super-hydrophobic surface has a strong ability to restrain frost growth. The frost deposition on this bionic surface was delayed 55 minutes when compared with a plain copper surface under the conditions of a cold plate temperature of -10.1 °C, air temperature of 18.4 °C, and relative humidity of 40%. A theoretical analysis was also presented to explain the observed phenomena. © 2008 Wiley Periodicals, Inc.

Keyword:

Crystal structure Deposition Drop formation Copper Hydrophobicity Crystallography Natural convection Bionics Surface chemistry Contact angle

Author Community:

  • [ 1 ] [Gou, Yunjun]Department of Civil Engineering, Tangshan University, Tangshan, China
  • [ 2 ] [Liu, Zhongliang]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China
  • [ 3 ] [Wang, Jieteng]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China
  • [ 4 ] [Cheng, Shuiyuan]College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China

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Source :

Heat Transfer - Asian Research

ISSN: 1099-2871

Year: 2008

Issue: 7

Volume: 37

Page: 412-420

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 10

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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