Lattice Boltzmann simulations of droplet impact onto surfaces with varying wettabilities
Lattice Boltzmann simulations of droplet impact onto surfaces with varying wettabilities
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2015.11.088
复制
发表时间：
2016-04
影响因子：
5.2
通讯作者：
K. A. Raman;R. Jaiman;Thong-See Lee;H. Low
中科院分区：
文献类型：
--
作者：
K. A. Raman;R. Jaiman;Thong-See Lee;H. Low
模拟了液滴在固体基底上的冲击，以评估表面润湿特性的不均匀性的影响。采用了基于相场格子Boltzmann公式的高密度比多相求解器。研究了后退接触角和润湿性梯度对液滴撞击固体表面的耦合动力学的影响。模拟表明，后退接触角是决定冲击过程最终物理结果的关键润湿参数。切向速度分量和后退的接触角之间的相互作用，在倾斜碰撞的情况下，液滴形状的演变有趣的动力学行为。基底的润湿性梯度的形式的不均匀性被发现诱导的方向性行为的运动的影响液滴。液滴运动的特征在于沿液滴的上游部分的强烈反冲沿着，随后是下游接触线的二次扩散。
A liquid drop impacting on a solid substrate is simulated to evaluate the effect of inhomogeneities in the wetting characteristics of the surface. A high density ratio multiphase solver based on phase-field lattice Boltzmann formulation has been employed. Influence of receding contact angle and wettability gradient is investigated to analyse the coupled dynamics of the impacting droplet on the solid surface. Simulations indicate that the receding contact angle is a key wetting parameter to determine the final physical outcome of the impact process. Interplay between tangential velocity component and receding contact angle results in interesting dynamical behaviours in the evolution of the droplet shape for oblique impact scenarios. Substrate inhomogeneities in the form of wettability gradient is found to induce a directional behaviour to the motion of the impacting droplet. The droplet motion is characterised by intense recoiling along the upstream part of the droplet, followed by secondary spreading of the downstream contact line.