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How heterogeneous wettability enhances boiling

Author

Listed:
  • Toledano, Juan Carlos Fernandez
  • De Coninck, Joël
  • Dunlop, François
  • Huillet, Thierry

Abstract

For super-heated water on a substrate with hydrophobic patches immersed in a hydrophilic matrix, one can choose the temperature so that micro-bubbles will form, grow and merge on the hydrophobic patches and not on the hydrophilic matrix. Until covering a patch, making a pinned macro-bubble, a bubble has a contact angle π−θ2, where θ2 is the receding contact angle of water on the patch material. This pinned macro-bubble serves as the initial condition of a quasi-static growth process, leading to detachment through the formation of a neck, so long as depinning and dewetting of the hydrophilic matrix was avoided during the growth of the pinned bubble: the bubble contact angle should not exceed π−θ1, where θ1 is the receding contact angle of water on the matrix material. The boiling process may then enter a cycle of macro-bubbles forming and detaching on the patches; the radii of these patches can be optimized for maximizing the heat transfer for a given substrate area.

Suggested Citation

  • Toledano, Juan Carlos Fernandez & De Coninck, Joël & Dunlop, François & Huillet, Thierry, 2023. "How heterogeneous wettability enhances boiling," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 622(C).
    • Handle: RePEc:eee:phsmap:v:622:y:2023:i:c:s0378437123004028
    DOI: 10.1016/j.physa.2023.128847
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