Three-dimensional numerical investigation on micro-meter droplet impact and penetration into the porous media with different velocities

Hongxin Deng,Yongqiang Yang,Shibiao Wu,Yanlu Huang,J Zhu,Zhiyi Chen

doi:10.1051/matecconf/202235501009

Hongxin Deng, Yongqiang Yang + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/202235501009

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Abstract

Droplets impacting and penetration into porous media is commonly seen in natural and engineering processes, in which the kinetics and capillary effect are of great importance to the lateral spreading and vertical penetration. In this study, a three-dimensional numerical simulation method was proposed to study the micro-meter droplet impact and penetration into the porous media. It is found that both the lateral spread and vertical penetration occur on the millisecond timescale and larger velocity will enhance the lateral spreading but have little influence on the penetration time and depth. The direct numerical method proposed in this study can be applied to predict the actual spreading and penetration status in the droplet-powder system and further insight into the droplet-powder interaction.

Highlights

Droplets impacting and penetration into porous media is commonly seen in natural and engineering processes such as raindrops landing on sand and binder jetting technology
In binder jetting additive manufacturing (BJAM), binder droplets are selectively deposited on the powder bed to join particles together
It is of great importance to study the impact and penetration process because the lateral spreading diameter and the penetration depth have a great influence on the layer thickness and the dimensional accuracy

Summary

Introduction

Droplets impacting and penetration into porous media is commonly seen in natural and engineering processes such as raindrops landing on sand and binder jetting technology. The impact process can be captured by using high-speed imaging technology, the liquid flow, velocity and pressure field inside the powder bed is hard to study experimentally. Hua Tan[7] proposed a direct numerical simulation method to study the micron-sized droplet impacting on the loose powder bed and found that the large impact. Fu[8] performed a 2-dimensional numerical simulation on sessile droplet spreading and penetration on porous surfaces by the VOF and CSF method. The numerical simulation of a single micro-meter droplet impact and penetration into the closely packed powder bed with different velocities is presented In current study, assuming all the powder particles fixed at their position and ignoring the impact force of droplets. the numerical simulation of a single micro-meter droplet impact and penetration into the closely packed powder bed with different velocities is presented

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