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Universality of stretching separation.
David Baumgartner1, Günter Brenn1, Carole Planchette1
1Institute of Fluid Mechanics and Heat Transfer, Graz University of Technology, A-8010 Graz, Austria.
Journal of Fluid Mechanics
|March 11, 2022
Summary
We developed a model to predict liquid drop fragmentation during off-center collisions. This model accurately predicts fragmentation limits based on a critical aspect ratio, applicable across various liquid properties without parameter tuning.
Area of Science:
- Fluid Dynamics
- Multiphase Flow
Background:
- Understanding drop collisions is crucial in various industrial processes.
- Predicting fragmentation limits is essential for controlling spray behavior.
Purpose of the Study:
- To develop a predictive model for the fragmentation limit of off-center drop collisions.
- To investigate the underlying mechanism of stretching separation.
- To extend the model to drop-jet collisions.
Main Methods:
- Developed a theoretical model based on energy balance.
- Defined fragmentation based on a critical aspect ratio (3.25).
- Modeled drop-jet collisions as sequential drop-drop collisions.
Main Results:
- The model accurately predicts fragmentation limits across diverse liquid properties without parameter adjustment.
- Stretching separation is linked to the merged drop exceeding a critical aspect ratio.
- Liquid viscosity influences aspect ratio evolution.
Conclusions:
- The developed model provides a robust method for predicting drop collision fragmentation.
- The findings offer insights into fluid behavior in both drop-drop and drop-jet impacts.
- The approach can be adapted for complex multiphase flow scenarios.
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