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A new approach to understanding the effects of surface wettability on nucleate boiling

Published online by Cambridge University Press:  05 August 2009

Hai Trieu Phan ,
Nadia Caney ,
Philippe Marty ,
Stéphane Colasson  and
Jérôme Gavillet
Hai Trieu Phan
Affiliation:
LITEN/GRETh, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France LEGI, BP 53, 38041 Grenoble Cedex 9, France
Nadia Caney
Affiliation:
LEGI, BP 53, 38041 Grenoble Cedex 9, France
Philippe Marty
Affiliation:
LEGI, BP 53, 38041 Grenoble Cedex 9, France
Stéphane Colasson
Affiliation:
LITEN/GRETh, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
Jérôme Gavillet
Affiliation:
LITEN/LTS, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
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Abstract

Although boiling process has been a major subject of research for several decades, its physics still remain unclear and require further investigation. This study aims at highlighting the effects of surface wettability on pool boiling heat transfer. Nanocoating techniques were used to vary the water contact angle from 20 to 110° by modifying nanoscale surface topography and chemistry. The experimental results obtained disagree with the predictions of the classical models. A new approach of nucleation mechanism is established to clarify the nexus between the surface wettability and the nucleate boiling heat transfer. In this approach, we introduce the concept of macro- and micro- contact angles to explain the observed phenomenon.

Keywords

Wettabilityheat transferboilingcontact anglenanocoatingMouillabilitétransfert thermiqueébullitionangle de contactnanostructuration
Type
Research Article
Information
Mechanics & Industry , Volume 10 , Issue 3-4: 19e Congrès français de mécanique (CFM 2009) , May 2009 , pp. 223 - 230
Copyright
© AFM, EDP Sciences, 2009

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