When a high-speed droplet impacts on mesh screens, part of the droplet penetrates the screen through its pores and generates smaller secondary drops, which spray downstream in a conical distribution. This instantaneous phase fragmentation phenomenon has been widely utilized in liquid spray applications and multiple-phase liquid separation. During droplet deformation, the intense liquid–gas fragmentation can lead to high nonequilibrium effect, which makes it hard to simulate by traditional fluid computational method. In this study, for the first time, we provided a numerical method to simulate the entire process of penetration dynamic behaviors. This 3D droplet-impact model based on MDPD (many-body dissipative particle dynamics) method exhibits high stability. A special solid–liquid boundary condition was proposed and successfully reduced the massive computational resources wasted on the solid mesh surface. To verify our model, the impacting of a droplet on a flat surface and on a mesh screen were simulated, respectively. The result showed a good match with our previous drop impact study and our experiment of the whole process about a droplet fragmented into hundreds of small drops. We further studied the mass transfer ratio (the ratio of penetrated drops to the initial droplet) and the ejection angle (the angle of the spray cone). The mass transfer ratio and ejection angle can be approximated as a function of Weber number, solid fraction and mesh number by summarizing the regular drop-penetrated behaviors over initial speed and mesh number.

当高速液滴撞击网筛时，部分液滴会通过其孔隙渗透筛网，并产生较小的次级液滴，这些液滴以圆锥形分布向下游喷射。这种瞬时相碎裂现象已广泛应用于液体喷涂应用和多相液体分离中。在液滴变形过程中，强烈的液-气碎裂会导致高度的非平衡效应，这使其很难通过传统的流体计算方法进行模拟。在这项研究中，我们首次提供了一种数值方法来模拟渗透动力学行为的全过程。这种基于MDPD（多体耗散粒子动力学）方法的3D液滴碰撞模型具有很高的稳定性。提出了一种特殊的固液边界条件，并成功减少了固体网格表面上浪费的大量计算资源。为了验证我们的模型，分别模拟了液滴在平面和筛网上的撞击。结果表明与我们之前的液滴影响研究以及将液滴破碎成数百个小液滴的整个过程的实验非常吻合。我们进一步研究了传质比（渗透液滴与初始液滴的比率）和喷射角（喷雾锥的角度）。通过总结在初始速度和网格数上规则的液滴渗透行为，可以将传质比和喷射角近似为韦伯数，固体分数和网格数的函数。为了验证我们的模型，分别模拟了液滴在平面和筛网上的撞击。结果表明与我们之前的液滴影响研究以及将液滴破碎成数百个小液滴的整个过程的实验非常吻合。我们进一步研究了传质比（渗透液滴与初始液滴的比率）和喷射角（喷雾锥的角度）。通过总结在初始速度和网格数上规则的液滴渗透行为，可以将传质比和喷射角近似为韦伯数，固体分数和网格数的函数。为了验证我们的模型，分别模拟了液滴在平面和筛网上的撞击。结果表明与我们之前的液滴影响研究以及将液滴破碎成数百个小液滴的整个过程的实验非常吻合。我们进一步研究了传质比（渗透液滴与初始液滴的比率）和喷射角（喷雾锥的角度）。通过总结在初始速度和网格数上规则的液滴渗透行为，可以将传质比和喷射角近似为韦伯数，固体分数和网格数的函数。结果表明与我们之前的液滴影响研究以及将液滴破碎成数百个小液滴的整个过程的实验非常吻合。我们进一步研究了传质比（渗透液滴与初始液滴的比率）和喷射角（喷雾锥的角度）。通过总结在初始速度和网格数上规则的液滴渗透行为，可以将传质比和喷射角近似为韦伯数，固体分数和网格数的函数。结果表明与我们之前的液滴影响研究以及将液滴破碎成数百个小液滴的整个过程的实验非常吻合。我们进一步研究了传质比（渗透液滴与初始液滴的比率）和喷射角（喷雾锥的角度）。通过总结在初始速度和网孔数上规则的液滴渗透行为，可以将传质比和喷射角近似为韦伯数，固体分数和网孔数的函数。