A Heat Transfer Model of Dropwise Condensation Underneath a Horizontal Substrate

Yun Fu Chen

doi:10.4028/www.scientific.net/AMR.199-200.1604

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 199-200A Heat Transfer Model of Dropwise Condensation...

A Heat Transfer Model of Dropwise Condensation Underneath a Horizontal Substrate

Abstract:

For finding influence of the condensing surface to dropwise condensation heat transfer, a fractal model for dropwise condensation heat transfer has been established based on the self-similarity characteristics of droplet growth at various magnifications on condensing surfaces with considering influence of contact angle to heat transfer. It has been shown based on the proposed fractal model that the area fraction of drops decreases with contact angle increase under the same sub-cooled temperature; Varying the contact angle changes the drop distribution; higher the contact angle, lower the departing droplet size and large number density of small droplets; dropwise condensation translates easily to the filmwise condensation at the small contact angle ;the heat flux increases with the sub-cooled temperature increases, and the greater of contact angle, the more heat flux increases slowly.

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Periodical:

Advanced Materials Research (Volumes 199-200)

Pages:

1604-1608

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.199-200.1604

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Online since:

February 2011

Authors:

Yun Fu Chen

Keywords:

Contact Angle (CA), Dropwise Condensation, Fractal, Heat Transfer

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