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

Summary: Do surfaces with mixed hydrophilic and hydrophobic areas enhance
pool boiling?
Amy Rachel Betz,1
Jie Xu,2
Huihe Qiu,3
and Daniel Attinger1,a
1
Mechanical Engineering, Columbia University, New York 10027, USA
2
Mechanical Engineering, Washington State University, Vancouver, Washington 98686, USA
3
Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water
Bay, Kowloon, Hong Kong
Received 1 August 2010; accepted 6 August 2010; published online 6 October 2010
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

  

Source: Attinger, Daniel - Department of Mechanical Engineering, Columbia University

 

Collections: Engineering