Determination of the single droplet post-impingement pattern on a dry wall: A data-driven approach

Zhai, Jiachen; Lee, Seong-Young

doi:10.1016/j.rineng.2023.100887

Results in Engineering

2023

DOI: 10.1016/j.rineng.2023.100887

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Determination of the single droplet post-impingement pattern on a dry wall: A data-driven approach

Jiachen Zhai¹,

Seong-Young Lee²

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2024

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Cited by 2 publications

References 43 publications

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Liquid metal droplets impacting superhydrophobic surface in a viscous (non-oxidizing) environment

Agarwal,

Mohamad

2024

Physics of Fluids

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The hypothesis of the present research is the existence of distinct spatial-temporal characteristics of non-oxidized liquid metal (LM) droplets impacting a solid surface. To provide a quantitative claim to this hypothesis, we created a test matrix based on the well-known impingement regime map bounded by two dimensionless quantities—Weber number (We) and Ohnesorge number (Oh). The range of these quantities is from 10−2 to 102 (We) and 10−3 to 101 (Oh), leading to Reynolds number (Re) (≡We1/2/Oh) to vary from 10−2 to 104. The class of LMs opted for are post-transition metals—eutectic gallium alloys—due to their several desired practical features, such as low melting point, non-toxicity, and low vapor pressure. The research is conducted using numerical experiments performed using C++ OpenFOAM libraries. To ensure the reliability of the code, we tested our work with numerous impingement behaviors of fluids available in the literature. A plethora of droplet behaviors are reported, such as deposition, rebound, bubble entrapment, and splash. Several features of droplet impingement were critically examined, such as temporal spreading factor, maximum spreading factor, and contact time of droplets on the surfaces. Moreover, the conventional scaling laws regarding the impingement behavior of droplets were tested, with new ones proposed where deemed necessary. Furthermore, a distinct route for the entrapment of droplet is observed, caused by the bulging of LM droplet during the recoiling stage. Emphasis is made to form delineations for these impingement characteristics using dimensionless groups (i.e., We, Oh, and Re).

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Liquid metal droplets impacting superhydrophobic surface in a viscous (non-oxidizing) environment

Agarwal,

Mohamad

2024

Physics of Fluids

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Experimental study on the influence of surface properties on droplet collision dynamics, from adhesion to rebound to breakup

Zhu,

Wang,

Dai

et al. 2024

Physics of Fluids

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Liquid droplet impact on dry surfaces often results in bouncing or breakup beyond a certain threshold. Surface contact angles, especially dynamic ones present during impact, significantly affect this process. Our experimental study underscores that advancing and receding contact angles influence droplet behaviors like rebounding and different types of breakup. This discovery provides new insights and criteria for understanding liquid droplet impact on surfaces. Special characteristics were found in the breakup on microstructured surfaces: the size of fractured droplets notably decreases, and the spreading–breakup occurs more easily and earlier. Additionally, microstructured surfaces reduce contact time to some extent. Furthermore, the uniqueness of oblique impacts is mainly reflected in how they lower the threshold of the receding contact angle for rebound. Studying the correlations and differences in droplet rebound and breakup related to these surface characteristics will contribute to improving research on liquid–solid interactions and the design of hydrophobic surfaces, including microstructured surfaces.

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Determination of the single droplet post-impingement pattern on a dry wall: A data-driven approach

Cited by 2 publications

References 43 publications

Liquid metal droplets impacting superhydrophobic surface in a viscous (non-oxidizing) environment

Liquid metal droplets impacting superhydrophobic surface in a viscous (non-oxidizing) environment

Experimental study on the influence of surface properties on droplet collision dynamics, from adhesion to rebound to breakup

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