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Related Experiment Video

Updated: Jul 15, 2026

Visualization of High Speed Liquid Jet Impaction on a Moving Surface

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Published on: April 17, 2015

Droplets Impacting on Superheated Surfaces with Asymmetric Re-Entrant Microgrooves.

Ting-Yu Hsu¹, Hung-Chih Chen¹, Chung-Te Huang^1,2

¹Department of Mechanical Engineering, National Taiwan University, Taipei, 10617, Taiwan.

|February 24, 2025

Summary

Engineered surfaces with asymmetric re-entrant microgrooves (ARG surfaces) significantly improve droplet cooling on hot surfaces. These novel surfaces reduce droplet contact time and enhance heat transfer, even at extreme temperatures up to 725°C.

Keywords:

asymmetric re‐entrant microgrooves central velocity contact time displacement factor droplet leidenfrost point

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Last Updated: Jul 15, 2026

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Area of Science:

Materials Science
Thermal Engineering
Fluid Dynamics

Background:

Droplet impact on hot surfaces is vital for thermal management.
Efficient cooling requires rapid droplet detachment, directional shedding, and suppressed Leidenfrost effect.
Existing surfaces fail to achieve all these simultaneously at high temperatures.

Purpose of the Study:

To introduce and characterize novel asymmetric re-entrant microgroove (ARG) surfaces.
To demonstrate simultaneous reduction in contact time, directional shedding, and Leidenfrost suppression.
To develop a theoretical model for predicting Leidenfrost points (LFPs) on these surfaces.

Main Methods:

Fabrication of ARG surfaces with asymmetric re-entrant microgrooves.
Experimental droplet impact analysis at temperatures from 350 to 650°C.
Development of a theoretical model for LFP prediction.
Comparative thermal performance analysis using temperature profiling.

Main Results:

ARG surfaces exhibit LFPs as high as 725°C.
Contact times were below the theoretical limit across tested temperatures.
Enhanced droplet velocities and displacement factors were observed.
ARG surfaces showed superior cooling performance compared to plain silicon surfaces.

Conclusions:

ARG surfaces offer a promising solution for efficient cooling in high-temperature applications.
These surfaces overcome limitations of existing engineered surfaces for droplet thermal management.
The developed theoretical model aids in designing surfaces with tailored LFP characteristics.