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High Throughput Analysis of Liquid Droplet Impacts
Published on: March 6, 2020
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Droplet impact on heated powder bed.
Dongdong Liu1, Hong-Wei Tan, Tuan Tran
1School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore. ttran@ntu.edu.sg.
Soft Matter
|December 1, 2018
Summary
Droplet impacts on heated powder beds exhibit unique behaviors like rebound and fluidization. Maximum spreading increases with temperature, leading to a new empirical scaling law.
Area of Science:
- Fluid dynamics
- Materials science
- Heat transfer
Background:
- Droplet impact dynamics are complex, involving spreading, bubble nucleation, splashing, crater formation, and fluidization.
- Elevated powder bed temperatures introduce unique phenomena not observed in isothermal impacts.
Purpose of the Study:
- To experimentally characterize droplet impact behaviors on heated powder beds.
- To identify and analyze phenomena specific to heated surfaces, such as rebound and fluidization.
- To investigate the relationship between surface temperature and droplet spreading dynamics.
Main Methods:
- Experimental investigation of droplet impacts across a range of impact velocities.
- Systematic variation of powder bed surface temperatures.
- High-speed imaging and analysis of impact events.
Main Results:
- Observed phenomena unique to heated powder beds include droplet rebound, liquid film rupture, bubble nucleation, and powder fluidization.
- Maximum spreading diameter of droplets was found to increase with increasing powder bed surface temperature.
- An empirical scaling law was developed to quantitatively describe the relationship between spreading diameter and surface temperature.
Conclusions:
- Droplet impact dynamics on heated powder beds are significantly influenced by surface temperature.
- The findings provide a quantitative understanding of heat transfer effects on droplet-solid interactions.
- The proposed scaling law offers a predictive tool for optimizing processes involving droplet impacts on heated powders.
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