Simulation and analytical modeling of high-speed droplet impact onto a surface

The fluid dynamics of liquid droplet impact on surfaces hold significant relevance to various industrial applications. However, high impact velocities introduce compressible effects, leading to material erosion. A gap in understanding and modeling these effects has motivated this study. We simulated...

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Bibliographic Details
Published in:Physics of fluids (1994) 2024-01, Vol.36 (1)
Main Author: Weigand, Bernhard
Format: Article
Language:English
Subjects:
Cavitation
Compressibility effects
Droplets
Fluid dynamics
Impact loads
Impact velocity
Industrial applications
Low pressure
Mathematical analysis
Mathematical models
Modelling
Rarefaction
Solid surfaces
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Summary:The fluid dynamics of liquid droplet impact on surfaces hold significant relevance to various industrial applications. However, high impact velocities introduce compressible effects, leading to material erosion. A gap in understanding and modeling these effects has motivated this study. We simulated droplet impacts on solid surfaces and proposed a new analytical model for impact pressure and droplet turning line, targeting at predictions for enhanced cavitation. The highly compressed liquid behind the droplet expands sideways, causing lateral jetting. As the droplet encounters a shock wave, it reflects as a rarefaction wave, leading to low-pressure zones within the droplet. These zones converge at the droplet's center, causing cavitation, which, upon collapse, induces another shock wave, contributing to erosion. Using the well-established model for the low-velocity impact shows a significant discrepancy. Hence, an analytical model for the turning line radius is introduced, incorporating the lateral jetting's characteristic length scale. Comparing our model with existing ones, our new model exhibits superior predictive accuracy.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0186883