| Cite this article as: Su Ren-Jian,Chen Xiao-Yong,You Zi-Hao. Molecular Dynamics Simulation of Printed Metal Microdroplets Impacting on Rough Surfaces [J]. J. At. Mol. Phys.(原子与分子物理学报), 2025, 42: 042003 (in Chinese) |
| Molecular Dynamics Simulation of Printed Metal Microdroplets Impacting on Rough Surfaces |
| Hits 114 Download times 49 Received:November 24, 2023 Revised:December 05, 2023 |
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| DOI
10.19855/j.1000-0364.2025.042003 |
| Key Words
metal microdroplet impaction rough substrate temperature molecular dynamics |
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| Abstract
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| The study of the behavior of the metal microdroplet impacting on a solid surface is of great significance for predicting the morphology of the microdroplet and realizing high-precision print manufacturing. However, due to the difficulty of performing experiments on metal microdroplets impacting at the micro/nanoscale, the morphology change and thermo-capillary effect mechanism involving metal microdroplets impacting on rough surfaces are still unclear. In this paper, molecular dynamics simulations are used to study the dynamic behavior of the gallium-indium microdroplet impacts on rough surfaces, and quantitatively analyze the effects of the impact velocity, the rough structure, and the different temperatures on the impact behavior of the microdroplet. The results show that with the increase of the impact velocity, the microdroplet shows three modes of deposition, bouncing and splashing, and the maximum spreading factor of the microdroplet shows a power function relationship with the Weber number. In addition, by modifying the rough structure of the substrate, it is found that changes in the spacing or height of the structure have different influences on the bouncing behavior of the microdroplet, which could effectively promote or inhibit the bouncing behavior. Finally, it is analyzed that the spreading diameter of the microdroplet becomes larger with the increase of temperature, and the viscous dissipation generated also increases. The results provide a theoretical basis for the effective pre-diction of the impact behavior of metal microdroplets. |
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