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第十二届全国流体力学学术会议

作者： Vinod Ashok Thale Mostafa Abouelsoud Marie-Jean THORAVAL State key Laboratory for strength and vibration of mechanical structure International Center for Applied Mechanics School of Aerospace Xian Jiaotong University Mechanical engineering department Faculty of Engineering South Valley University

The impact of an air-liquid compound drop onto a liquid surface was investigated numerically, focusing on the vertical counter-jet emerging from the bottom of the bubble during impact. We systematically changed the depth of the liquid pool, bubble size and position, and liquid viscosity to observe their influences on the maximum jet velocity. It is observed that the jetting is strongly attenuated by the deformable liquid pool compared to the impact on a solid surface. In addition, a mathematical model was proposed to explain the jetting mechanism and how it is affected by the different parameters.

关键词： Air-in-liquid compound drop VOF-simulation drop impact

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impact of drops on Non-wetting Biomimetic Surfaces

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Journal of Bionic Engineering 2009年第4期6卷 330-334页

作者： Alain Merlen Philippe Brunet Institut d'Electronique de Microelectronique et Nanotechnologie IEMN Universite des sciences et technologies de Lille1UMR CNRS 8520Avenue Poincare BP 6006959652 Villeneuve d'Ascq cedexFrance

We have carried out an experimental study of liquid drop impact on superhydrophobic substrates covered by a carpet of chemically coated *** micro-structure of the surface is similar to some biological ones(Lotus leaf for example).In this situation the contact angle can then be considered as equal to 180 degrees,with no *** to its initial inertia,the drop experiences a flattening phase after it hits the surface,taking the shape of a *** it reaches its maximal lateral extension,the drop begins to retract and bounces *** have extracted the lateral extension of the drop,and we propose a model that explains the *** find a limit initial velocity beyond which the drop protrudes into the nano-wire *** discuss the relevance of practical issues in terms of self-cleaning surfaces or spray-cooling.

关键词： superhydrophobic surfaces drop impact

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Spreading of a Multicomponent drop in Water: Solutions and Suspensions

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Fluid Dynamics & Materials Processing 2020年第4期16卷 723-735页

作者： Andrey Y.Ilinykh Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences Moscow119526Russia

The distribution of material resulting from the impact of a freely falling drop with a target liquid has been studied by photo and video registration *** cases have been investigated by considering drops made of aqueous solutions(ink,salt,acid)and including fine solid particles(i.e.,suspensions).New features have been observed in terms of flow dynamics and thin components produced as a result of the impact(such as banded elements,ligaments,and vortices at the surface of the liquid).In particular,the characteristics of emerging netlike structures have been found to depend on the size of the suspension *** the case of acetic acid,a different patterning behavior has been obtained:sequences of concentric arcs are produced in that ***,linear scaling laws and the discrete nature of the distribution of the droplet material seem to be features common to all the cases considered.

关键词： drop impact splashes ligaments material distribution

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Numerical simulation of droplet impact on a thin liquid layer based on density-scaled balanced CSF model

Numerical simulation of droplet impact on a thin liquid laye...

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第二十七届全国水动力学研讨会

作者： YE Zhou-teng YU Ching-hao ZHAO Xi-zeng Ocean College Zhejiang University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering

A practical numerical framework for free surface flow with the effect of tension force is proposed in this *** numerical framework consists of a CIP-based flow solver,the density-scaled balanced CSF（continuum surface force） method and a level set method solved by5-order WENO（weighted essential non-oscillation） *** density-scaled balanced CSF model is implemented under a level set based *** of the CSF model is done within a benchmark test of an equilibrium drop with exact *** density-scaled balanced CSF model can reduce spurious currents existing in the previous CSF models.A numerical simulation of droplet impact is carried out *** results show that the numerical framework can well capture the physics of droplet splashing during the drop impact on a thin layer process.

关键词： Kew words:level set density-scaled balanced surface tension force drop impact

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Numerical study on the maximal spreading of a drop containing a bubble impacting on a solid surface

Numerical study on the maximal spreading of a drop containin...

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第十一届全国流体力学学术会议

作者：魏瑀陶益壮西安交通大学航天航空学院国际应用力学中心

drop impact is a ubiquitous phenomenon in nature and many engineering applications,from marine science,soil and water conservation to combustion and ink-jet *** application of hollow powder in the deposition process of thermal barrier coatings can generate a thicker and more uniform *** hollow particles are molten before impacting on the target surface,corresponding to a drop containing a *** studies observed that such air-in-liquid compound drops can generate a vertical jet during impact,and that the maximum spreading of the drop is reduced due to the presence of the *** this research,we systemically studied the effect of bubble size,liquid properties and impact velocity on the spreading dynamics of a drop containing a bubble impacting on a solid ***,we propose a model for the maximum spreading of the impacting air-in-liquid compound drop,adapted from previous theories for pure liquid drop impact.

关键词： drop impact Air-in-liquid compound drop Maximal spreading

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An Incompressible SPH Method for Simulating droplet impaction Problems

An Incompressible SPH Method for Simulating Droplet Impactio...

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2012颗粒材料计算力学会议

作者： Xu Xiao-Yang Jie Ou-Yang Department of Applied Mathematics, Northwestern Polytechnical University, Xi’an 710129, China

In this paper, the phenomena of a fluid droplet impacting on a rigid plate are numerically simulated using an incompressible smoothed particle hydrodynamic (ISPH) method. This method uses a pressure Poisson equation to satisfy the incompressibility constraints and the Navier-Stokes equations are solved in a Lagrangian form using a two-step fractional method. The ISPH method is validated by solving the impact of a droplet with a horizontal plate and comparing the ISPH results with those obtained by other numerical methods. Following, the numerical method is extended to simulate the spreading deformation of drop impacting on an inclined plate, and the effects of surface inclination on the spreading deformation are discussed. It is shown that in all cases the ISPH method is stable and fairly accurate and can significantly reduce the pressure noise in comparison with WCSPH.

关键词： incompressible SPH free surface drop impact rigid plate

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