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Roughness-enhanced collection of condensed droplets.

Joachim Trosseille1, Anne Mongruel2, Laurent Royon3

  • 1Physique et Mécanique des Milieux Hétérogènes, CNRS, ESPCI Paris - PSL University, Sorbonne Université, Sorbonne Paris Cité, 75005, Paris, France. joachim.trosseille@espci.fr.

The European Physical Journal. E, Soft Matter
|November 28, 2019
PubMed
Summary

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This summary is machine-generated.

Surface roughness from sand-blasting surprisingly enhances droplet shedding for passive dew harvesting. This method increases nucleation sites and drop coalescence, improving water collection efficiency by about 30%.

Area of Science:

  • Materials Science
  • Surface Engineering
  • Water Harvesting

Background:

  • Droplet pinning limits gravity shedding, hindering low condensation processes like passive dew harvesting.
  • Passive dew harvesting offers a sustainable alternative water source, but efficiency is often limited by droplet removal.

Purpose of the Study:

  • To investigate the effect of surface roughness on droplet shedding during condensation.
  • To enhance the efficiency of passive dew harvesting systems.

Main Methods:

  • Experimental analysis of droplet behavior on sand-blasted surfaces with varying roughness.
  • Observation of nucleation, coalescence, and shedding dynamics under controlled condensation conditions.
  • Evaluation of water collection rates on modified substrates, including edge effects.
Keywords:
Flowing Matter: Interfacial phenomena

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Main Results:

  • Moderate sand-blasting, increasing surface roughness, paradoxically improved droplet shedding compared to smoother substrates.
  • Enhanced nucleation site density and sub-micron scale droplet coalescence accelerated drop sliding.
  • Substrate edges facilitated water collection through early sliding of larger drops, acting as natural wipers.
  • Combined effects of sand-blasting and edge design increased dew condensation collection rates by approximately 30%.

Conclusions:

  • Controlled surface roughening via sand-blasting is an effective strategy to overcome droplet pinning in condensation.
  • Optimized surface treatments can significantly enhance the performance of passive dew harvesting technologies.
  • The synergistic effect of surface modification and substrate geometry offers a promising approach for efficient water collection.