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Do surfaces with mixed hydrophilic and hydrophobic areas enhance pool boiling?

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4 Author(s)
Betz, Amy Rachel ; Mechanical Engineering, Columbia University, New York 10027, USA ; Xu, Jie ; Qiu, Huihe ; Attinger, D.

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.3485057 

We demonstrate that smooth and flat surfaces combining hydrophilic and hydrophobic patterns improve pool boiling performance. Compared to a hydrophilic surface with 7° wetting angle, the measured critical heat flux and heat transfer coefficients of the enhanced surfaces are, up to respectively, 65% and 100% higher. Different networks combining hydrophilic and hydrophobic regions are characterized. While all tested networks enhance the heat transfer coefficient, large enhancements of critical heat flux are typically found for hydrophilic networks featuring hydrophobic islands. Hydrophilic networks indeed are shown to prevent the formation of an insulating vapor layer.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 14 )

Date of Publication:

Oct 2010

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