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Updated: May 31, 2025

High Throughput Analysis of Liquid Droplet Impacts
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Droplets impact on sparse microgrooved non-wetting surfaces.

Longfei Zhang1, Jialong Wu1, Yingfa Lu1

  • 1Department of Mechanics, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, People's Republic of China.

Scientific Reports
|January 23, 2025
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Summary
This summary is machine-generated.

Droplets can bounce off microgrooved surfaces, with wetting states depending on surface structure and contact line density. Impact velocity limits for bouncing are determined by energy barriers and liquid penetration.

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Materials science

Background:

  • Microgrooved surfaces exhibit anisotropic properties affecting droplet behavior.
  • Understanding droplet-surface interactions is crucial for various applications.

Purpose of the Study:

  • Investigate droplet wettability, stability, and impact dynamics on sparse microgrooved polydimethylsiloxane (PDMS) surfaces.
  • Analyze the influence of surface solid fraction on droplet behavior.

Main Methods:

  • Experimental investigation of droplet impingement on microgrooved PDMS surfaces.
  • Analysis of wettability using advancing and receding contact angles.
  • Determination of wetting states (Cassie-Baxter vs. Wenzel) based on contact line density.
  • Experimental and theoretical analysis of droplet bouncing dynamics.

Main Results:

  • Anisotropic wettability observed due to surface micropatterning.
  • A criterion for droplet wetting states (collapsed/suspended) based on critical contact line density was proposed.
  • Droplets bounced off surfaces with a solid fraction of 0.158 within a specific impact velocity range.
  • Lower bouncing velocity limit linked to contact angle hysteresis; upper limit related to liquid penetration into cavities.

Conclusions:

  • Microgrooved PDMS surfaces exhibit anisotropic wetting properties.
  • Droplet wetting state depends on the interplay between surface structure and liquid properties.
  • Droplet bouncing is possible on these surfaces within defined impact velocity limits, influenced by surface morphology and energy dynamics.