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Related Experiment Video

Updated: Oct 21, 2025

High Throughput Analysis of Liquid Droplet Impacts

High Throughput Analysis of Liquid Droplet Impacts

Published on: March 6, 2020

Droplet Impact on Surfaces with Asymmetric Microscopic Features.

Susumu Yada¹, Blandine Allais², Wouter van der Wijngaart³

¹Department of Engineering Mechanics, Royal Institute of Technology, 100 44 Stockholm, Sweden.

Langmuir : the ACS Journal of Surfaces and Colloids

|September 1, 2021

Summary

This summary is machine-generated.

Droplet impact on textured surfaces shows asymmetric spreading when the line-friction capillary number is low. Surface friction and ridge geometry dictate droplet behavior, especially at low impact velocities.

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Area of Science:

Fluid dynamics
Surface science
Materials science

Background:

Liquid drop impact is crucial for industrial processes like cleaning, cooling, and coating.
The influence of surface topography (pores, roughness, texture) on droplet impact dynamics remains poorly understood.

Purpose of the Study:

To experimentally investigate the initial stages of droplet impact on surfaces with asymmetric (tilted) ridges.
To determine how surface texture influences droplet spreading asymmetry at low impact velocities.

Main Methods:

Experimental study of low-velocity droplet impacts on surfaces with tilted ridges.
Analysis of the role of impact velocity, surface tension, and line friction.
Definition and application of the line-friction capillary number (Ca_f) to quantify texture influence.

Main Results:

Spreading asymmetry is driven by the interplay between impact velocity and capillary speed, which depends on line friction.
At low line-friction capillary numbers (Ca_f ≪ 1), impact is asymmetric: friction governs spreading against ridge inclination, while corners pin the contact line with inclination.
At high line-friction capillary numbers (Ca_f ≫ 1), surface geometric details have minimal impact on dynamics.

Conclusions:

The line-friction capillary number (Ca_f) effectively characterizes the influence of surface topology on droplet impact.
Surface texture significantly impacts droplet spreading asymmetry, particularly under conditions of low line friction.
Understanding these dynamics is key for optimizing surface designs in various applications.