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采用光滑粒子流体动力学-离散单元法（SPH-DEM）对液滴撞击表面进行了数值模拟。

The numerical simulation of droplet impact on surfaces is conducted using the SPH-DEM method.

作者信息

Bu Shilong, Li Daming, Tao Hu, Hou Wenjie

机构信息

School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, China.

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, China.

出版信息

PLoS One. 2025 Jun 2;20(6):e0323418. doi: 10.1371/journal.pone.0323418. eCollection 2025.

DOI:10.1371/journal.pone.0323418
PMID:40455828
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12129337/
Abstract

The process of liquid droplet impinging upon the surface of particles entails complex dynamics and significant deformation. In this study, the smoothed particle hydrodynamics (SPH) method coupled with the discrete element method (DEM) is employed to investigate the motion process of liquid droplet impacting the particle surface. A surface tension model is introduced into the SPH motion equation to calculate the motion of the liquid droplet. In the SPH-DEM coupling module, the viscous force and capillary force between the liquid droplet and the particles are taken into account. The surface tension model is verified through two cases: the free deformation process of a stationary square liquid droplet and the impact of a liquid droplet on a hydrophobic wall. The accuracy of the DEM model is validated through experimental verification of dry particle collapse. And the experimental results validate the accuracy of the SPH-DEM model in simulating the liquid droplet impact on the particle surface. The simulation results are in good agreement with the experimental ones. Utilizing the SPH-DEM model, the influences of the droplet impact velocity and the particle diameter on the rebound phenomenon after the water droplet impacts the particle wall of the powder bed are respectively investigated. The results indicate that the higher the droplet impact velocity and the smaller the diameter of the powder bed particles, the faster the rebound rate of the droplet after impacting the powder bed layer.

摘要

液滴撞击颗粒表面的过程涉及复杂的动力学和显著的变形。在本研究中，采用光滑粒子流体动力学（SPH）方法与离散单元法（DEM）相结合来研究液滴撞击颗粒表面的运动过程。将表面张力模型引入SPH运动方程以计算液滴的运动。在SPH-DEM耦合模块中，考虑了液滴与颗粒之间的粘性力和毛细力。通过两种情况验证表面张力模型：静止方形液滴的自由变形过程和液滴对疏水壁的撞击。通过干颗粒坍塌的实验验证来验证DEM模型的准确性。实验结果验证了SPH-DEM模型在模拟液滴撞击颗粒表面方面的准确性。模拟结果与实验结果吻合良好。利用SPH-DEM模型，分别研究了液滴撞击速度和颗粒直径对水滴撞击粉末床颗粒壁后回弹现象的影响。结果表明，液滴撞击速度越高且粉末床颗粒直径越小，液滴撞击粉末床层后的回弹速率越快。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/72ac/12129337/24176c53c37f/pone.0323418.g013.jpg
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