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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

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Published on: March 5, 2014

Fast-freezing kinetics inside a droplet impacting on a cold surface.

Pallav Kant¹, Robin B J Koldeweij^2,3, Kirsten Harth²

¹Physics of Fluids Group, Max Planck Center Twente for Complex Fluid Dynamics and J. M. Burgers Centre for Fluid Mechanics, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands; d.lohse@utwente.nl p.kant@utwente.nl.

Proceedings of the National Academy of Sciences of the United States of America

|January 26, 2020

Summary

Investigating droplet freezing on cold surfaces reveals unique freezing patterns and a self-peeling effect. This study combines nucleation theory and hydrodynamics to understand solidification kinetics.

Keywords:

classical nucleation theory crystal growth droplet impact phase change solidification

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Area of Science:

Physics
Materials Science
Fluid Dynamics

Background:

Droplet solidification is crucial in natural phenomena and industrial processes like inkjet printing and chip manufacturing.
Understanding droplet freezing kinetics is essential for optimizing various technological applications.

Purpose of the Study:

To elucidate the freezing kinetics during droplet impact on an undercooled surface using total-internal reflection (TIR).
To investigate the peculiar freezing morphology and self-peeling phenomenon observed during droplet solidification.

Main Methods:

Utilized total-internal reflection (TIR) as an optical technique to observe droplet freezing.
Combined classical nucleation theory with large-scale hydrodynamics to analyze the solidification process.

Main Results:

Observed a unique freezing morphology with sequential advection of frozen fronts from the droplet center to boundaries at high undercooling.
Reported a self-peeling phenomenon of the frozen splat, driven by a transient crystalline state during solidification.

Conclusions:

The study successfully elucidates droplet freezing kinetics by integrating nucleation theory and hydrodynamics.
The findings offer insights into droplet solidification mechanisms, relevant for industrial applications.