Numerical investigation of multi-droplets deposited lines morphology with a multiple-relaxation-time lattice Boltzmann model
Numerical investigation of multi-droplets deposited lines morphology with a multiple-relaxation-time lattice Boltzmann model
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DOI：
10.1016/j.ces.2017.06.014
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发表时间：
2017-11
影响因子：
4.7
通讯作者：
Lei Zhang;Yunlong Zhu;Xiaoding Cheng
中科院分区：
文献类型：
--
作者：
Lei Zhang;Yunlong Zhu;Xiaoding Cheng
采用大密度比、高雷诺数的3D MRT赝势LB模型，研究了多液滴沉积线的形成和形态。考虑用几何形式代替流固相互作用的方法来模拟接触角滞后。在这项研究中特别感兴趣的是找出均匀线条形成的最佳条件。数值研究了液滴重叠率和推进接触角对熔化线条形态的影响。随着液滴重叠率的增加，可以定量地识别出孤立、扇形、均匀和隆起的线条形态。提出了获得均匀线条形态的最佳液滴重叠比，并通过改变Ohnesorge数进行了验证。研究了在最佳液滴重叠率下，液滴垂直间距对线条形态的影响，发现了两种聚结模式。结果表明，所提出的均匀线条形成的最佳重叠率不是充分条件，在异相合并模式下是有效的。
The formation and morphology of multi-droplets deposited lines are investigated by employing a 3D MRT pseudopotential LB model with large density ratios and high Reynolds numbers. A geometric formulation is considered to replace the fluid-solid interaction scheme to model the contact angles hysteresis. Of particular interest in this study is to find out the optimal conditions of uniform line formation. The effects of droplet overlap ratios and advancing contact angles on the lines morphology are investigated numerically. With the droplet overlap ratio increasing, the lines morphologies including isolate, scalloped, uniform and bulging formation are quantitatively identified. An optimal droplet overlap ratio is proposed to obtain uniform morphology of lines and validated via varying Ohnesorge numbers. The effects of vertical droplet spacing on the lines morphology at the optimal droplet overlap ratio is investigated and two coalescence modes are identified. Results show that the proposed optimal overlap ratio for uniform line formation is not sufficient condition and is valid in the case of out-of-phase coalescence mode.