AI Article Synopsis
- The behavior of droplets impacting surfaces with different wettabilities is complex and important for engineering, and this study investigates it using high-speed photography.
- The research identifies three types of droplet behavior upon impact: unbroken, tensile breakup, and shear breakup, influenced by factors like contact angle and Weber number.
- A new model is proposed to predict droplet spreading, providing insights into droplet breakup dynamics and leading to quantitative measurements of critical Weber numbers related to different breakup types.
Article Abstract
The dynamic behavior of impacting droplet shearing by the surface edge with different wettabilities is complicated and has great significance for engineering application. The morphological evolution of droplet with various Weber numbers () and wettability impacting on the edge of square substrate is investigated by high-speed photography. Moreover, the effects of the contact angle (α) and Weber numbers () on the shear breaking process of droplets are obtained. There are three types morphological evolution of impacting droplet are observed experimentally, including unbroken, tensile breakup, and shear breakup. Contact angle and Weber number have been proved to be the significant factors affecting the type of droplet morphological evolution. Meanwhile, the critical Weber number of different types are obtained quantitatively. Moreover, as α increases, the critical Weber numbers for breakup increase. In the shear breakup process, the mass ratio between the droplets remaining on the substrate and the initial droplets is maintained at 50%. Particularly, a reliable prediction model for the spreading of droplet impacting the side wall is proposed and compared with the experimental data. Overall, this study provides new direction and guidance for exploring droplet breakup kinetics.
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| http://dx.doi.org/10.1021/acs.langmuir.4c02253 | DOI Listing |
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