Purpose

This paper aims to investigate the influence of droplet infiltration and sliding on the deposition size and make a uniform deposition by controlling the interaction between droplets, using the three-dimensional lattice Boltzmann method (LBM) based on the actual working condition.

Design/methodology/approach

D3Q19 Shan-Chen LB approach is developed and optimized based on the metal droplet deposition. The Carnahan-Starling equation of state and transition layers are introduced to maintain the greater stability and low pseudo velocities. In addition, an additional collision term is adopted to implement immersed moving boundary scheme to deal with no-slip boundaries on the front of the phase change.

Findings

The numerical results show that the new¬ incoming droplet wet and slide off the solidified surface and the rejection between droplets are the reasons for the deviation of the actual deposition length. The total length of the longitudinal section negatively correlates with the deposition distance. To improve the dimensional accuracy, the deposition distance and repulsion rate need to be guaranteed. The optimal deposition distance is found to have a negative linear correlation with wettability.

Originality/value

The numerical model developed in this paper will help predict the continuous metal droplet deposition and provide guidance for the selection of deposition distance.

中文翻译：

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使用格子玻尔兹曼方法研究排斥作用下金属液滴沉积的尺寸精度

目的

本文旨在研究液滴渗透和滑动对沉积尺寸的影响，并通过控制液滴之间的相互作用，根据实际工况采用三维格子玻尔兹曼方法（LBM）进行均匀沉积。

设计/方法/方法

D3Q19 Shan-Chen LB 方法是基于金属液滴沉积开发和优化的。引入状态和过渡层的 Carnahan-Starling 方程以保持更高的稳定性和低伪速度。此外，采用额外的碰撞项来实现浸入式移动边界方案，以处理相变前沿的无滑移边界。

发现

数值结果表明，新进入的液滴润湿并滑离固化表面以及液滴之间的排斥是实际沉积长度偏差的原因。纵向截面的总长度与沉积距离呈负相关。为了提高尺寸精度，需要保证沉积距离和排斥率。发现最佳沉积距离与润湿性呈负线性相关。

原创性/价值

本文建立的数值模型将有助于预测连续金属液滴沉积，并为沉积距离的选择提供指导。