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Boundary-layer effects in droplet splashing
Guillaume Riboux1, José Manuel Gordillo1
1Área de Mecánica de Fluidos, Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos, Universidad de Sevilla, Avenida de los Descubrimientos s/n 41092, Sevilla, Spain.
Physical Review. E
|January 20, 2018
Summary
A new splash model incorporates boundary layer growth, accurately predicting the critical velocity for drop disintegration. This enhanced model improves understanding of liquid sheet ejection dynamics during splashing events.
Area of Science:
- Fluid dynamics
- Physics of liquids
- Surface science
Background:
- Drop impact on solid substrates can cause splashing when impact velocity exceeds a critical threshold.
- Splashing involves liquid sheet ejection, aerodynamic lift-off, and subsequent breakup due to capillary instabilities.
- Previous models did not fully account for boundary layer effects on splash dynamics.
Purpose of the Study:
- To refine a splash model by including the effect of boundary layer growth.
- To improve the prediction accuracy of the critical velocity for splashing (V*).
- To provide a more straightforward method for determining liquid sheet ejection timing.
Main Methods:
- Incorporation of boundary layer growth into an existing splash model.
- Comparison of model predictions with experimental measurements of critical splash velocity.
- Analysis of liquid sheet ejection dynamics.
Main Results:
- Excellent agreement between predicted and measured critical splash velocities across various conditions.
- The enhanced model accurately captures the influence of liquid/gas properties, pressure, and wettability.
- A simplified determination of liquid sheet ejection onset is achieved.
Conclusions:
- The inclusion of boundary layer growth is crucial for accurate splash modeling.
- The refined model offers improved predictive capabilities for drop impact phenomena.
- This work provides a more robust theoretical framework for understanding splashing.
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