Numerical investigation of solid particle penetration into liquid droplet

作者：Li X G; Fritsching U^*

来源：Materialwissenschaft und Werkstofftechnik, 2014, 45(8): 666-682.

DOI：10.1002/mawe.201400303

• particle-droplet collision
• Computational Fluid Dynamics CFD
• multiphase flow
• Volume of Fluid VoF
• dynamic mesh
• metal matrix composite MMC

Computational fluid dynamics (CFD) model is developed to study the penetration behaviour of a solid particle into a liquid droplet with respect to the production of metal-matrix-composite (MMC) particles. In contrast to existing theoretical models, the computational fluid dynamics model properly describes the multiphase flow situation (gas-droplet-particle) by means of Navier-Stokes equations coupled with Volume of Fluid method, Six Degrees of Freedom method, and dynamic mesh technique, respectively. The comparison with experimental data indicates that the computational fluid dynamics model can give accurate descriptions of the particle penetration behaviour by taking into account the penetration-induced droplet deformation and the cavity formation behind the penetrating particle. In the case of a cubic particle penetrating a droplet, two typical outcomes observed in simulations are: 1) the particle partially penetrates into the droplet and then is ejected by the droplet surface; 2) the particle completely penetrates into the droplet. The outcomes are categorized with Weber number (We) and Reynolds number (Re) in a regime map. The variation of the regime boundary is investigated by varying solid-liquid contact angle, particle/droplet size ratio, particle orientation, and particle-droplet collision direction. It is found that the critical velocity required for complete penetration increases rapidly with increasing solid fraction in semi-solid droplets.

• 出版日期2014-8