Simulating Hollow Droplet Impact on Concave Obstacles: A Volume of Fluid Approach

What is it about?

The research examines the impact of a hollow droplet on a solid concave obstacle, focusing on the hydrodynamic behavior and jet characteristics. The study uses the Volume Of Fluid (VOF) approach in OpenFoam software to simulate hollow droplet impact. The findings reveal that the height of the counter jet increases with higher impact velocities and edge wall heights, and the length of the counter jet is influenced by these factors as well. The study also shows that as the impact velocity rises from 5 to 10 m/s, the length of the counter jet grows 135%, and when it increases from 5 to 15 m/s, the length grows 215%. Additionally, the study shows that the height of the jet fluid splattered on the air grows taller as the height of the edge wall increases.

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Why is it important?

This research is important as it investigates the dynamic behavior and jet characteristics of a hollow droplet's impact on a solid concave mounted obstacle. The findings can be applied in various industries such as plasma coating, spray painting, and nanofiber bubble electrospinning. Understanding the hydrodynamic behavior and phase transition after impact is crucial for optimizing these industrial processes. Key Takeaways: 1. The study uses the Volume Of Fluid (VOF) approach in OpenFoam software to simulate hollow droplet impact. 2. A hollow droplet is defined as a glycerin shell fluid including an air cavity. 3. The height of the edge wall and impact velocity affect the counter jet's length and height. 4. The length of the counter jet increases with increased impact velocity and edge wall height. 5. The height of the jet fluid splattered on the air increases with reduced edge wall height. 6. The height of the counter jet and jet fluid splattered on the air increase with increased impact velocity. 7. The study used mesh convergence to verify mesh independence and found that mesh element size 0.13 mm was optimal for the simulation.