It is well known that heat transfer in dropwise condensation (DWC) is superior to that in filmwise condensation (FWC) by at least one order of magnitude. Surfaces with larger contact angle (CA) can promote DWC heat transfer due to the formation of “bare” condensation surface caused by the rapid removal of large condensate droplets and high surface replenishment frequency. Superhydrophobic surfaces with high contact angle (> 150°) of water and low contact angle hysteresis (< 5°) seem to be an ideal condensing surface to promote DWC and enhance heat transfer, in particular, for the steam-air mixture vapor. In the present paper, steam DWC heat transfer characteristics in the presence of noncondensable gas (NCG) were investigated experimentally on superhydrophobic and hydrophobic surfaces including the wetting mode evolution on the roughness-induced superhydrophobic surface. It was found that with increasing NCG concentration, the droplet conducts a transition from the Wenzel to Cassie-Baxter mode. And a new condensate wetting mode—a condensate sinkage mode—was observed, which can help to explain the effect of NCG on the condensation heat transfer performance of steam-air mixture on a roughness-induced superhydrophobic SAM-1 surface.
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Wetting Mode Evolution of Steam Dropwise Condensation on Superhydrophobic Surface in the Presence of Noncondensable Gas
Xuehu Ma,
Xuehu Ma
Institute of Chemical Engineering,
e-mail: xuehuma@dlut.edu.cn
Dalian University of Technology
, Dalian 116024, China
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Sifang Wang,
Sifang Wang
Institute of Chemical Engineering,
Dalian University of Technology
, Dalian 116024, China
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Zhong Lan,
Zhong Lan
Institute of Chemical Engineering,
Dalian University of Technology
, Dalian 116024, China
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Benli Peng,
Benli Peng
Institute of Chemical Engineering,
Dalian University of Technology
, Dalian 116024, China
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H. B. Ma,
H. B. Ma
Department of Mechanical and Aerospace Engineering,
University of Missouri-Columbia
, Columbia, MO 65211
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P. Cheng
P. Cheng
Department of Mechanical and Aerospace Engineering,
University of Missouri-Columbia
, Columbia, MO 65211
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Xuehu Ma
Institute of Chemical Engineering,
Dalian University of Technology
, Dalian 116024, China
e-mail: xuehuma@dlut.edu.cn
Sifang Wang
Institute of Chemical Engineering,
Dalian University of Technology
, Dalian 116024, China
Zhong Lan
Institute of Chemical Engineering,
Dalian University of Technology
, Dalian 116024, China
Benli Peng
Institute of Chemical Engineering,
Dalian University of Technology
, Dalian 116024, China
H. B. Ma
Department of Mechanical and Aerospace Engineering,
University of Missouri-Columbia
, Columbia, MO 65211
P. Cheng
Department of Mechanical and Aerospace Engineering,
University of Missouri-Columbia
, Columbia, MO 65211J. Heat Transfer. Feb 2012, 134(2): 021501 (9 pages)
Published Online: December 9, 2011
Article history
Received:
May 18, 2010
Revised:
August 23, 2011
Online:
December 9, 2011
Published:
December 9, 2011
Citation
Ma, X., Wang, S., Lan, Z., Peng, B., Ma, H. B., and Cheng, P. (December 9, 2011). "Wetting Mode Evolution of Steam Dropwise Condensation on Superhydrophobic Surface in the Presence of Noncondensable Gas." ASME. J. Heat Transfer. February 2012; 134(2): 021501. https://doi.org/10.1115/1.4005094
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