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Enhancing dropwise condensation through bioinspired wettability patterning.

Aritra Ghosh1, Sara Beaini, Bong June Zhang

  • 1Department of Mechanical and Industrial Engineering, University of Illinois at Chicago , Chicago, Illinois 60607, United States.

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Summary

Controlling condensate droplet size (Dmax) on surfaces enhances heat transfer. This study uses laser-patterned hydrophilic and superhydrophilic surfaces to manage droplet departure, improving condensation efficiency.

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Area of Science:

  • Heat Transfer
  • Surface Science
  • Condensation Phenomena

Background:

  • Dropwise condensation (DWC) heat transfer is significantly influenced by the maximum diameter (Dmax) of departing condensate droplets.
  • Controlling Dmax is crucial for optimizing heat transfer rates in DWC.

Purpose of the Study:

  • To present a facile technique for controlling Dmax in DWC within vapor/air atmospheres.
  • To enhance heat transfer rates by harnessing capillary forces for condensate removal.
  • To investigate various hydrophilic-superhydrophilic patterns for improved DWC.

Main Methods:

  • Utilized laser-patterned masking and chemical etching to create controlled wettability contrast on aluminum surfaces.
  • Fabricated alternating hydrophilic (contact angle ~78°) and superhydrophilic regions.
  • Examined DWC on patterned surfaces with different hydrophilic-superhydrophilic configurations, including straight strips and bioinspired interdigitated tracks.

Main Results:

  • Achieved an average Dmax on less-wettable domains that was 42% of the strip width.
  • Demonstrated an overall improvement in condensate collection rate by up to 19% compared to a control surface.
  • The bioinspired interdigitated pattern showed superior performance over straight patterns, especially under higher humidity with noncondensable gases (NCG).

Conclusions:

  • A novel technique effectively controls Dmax in DWC using wettability patterns without hydrophobic agents.
  • Harnessing capillary forces through patterned surfaces significantly enhances condensate removal and heat transfer rates.
  • Bioinspired designs offer superior performance for dropwise condensation under challenging conditions with noncondensable gases.