The impingement of a droplet on a rigid square obstacle in a microchannel is simulated numerically using a high-density-ratio pseudo-potential multi-relaxation time LBM. The effects of Reynolds (Re) number, Weber (We) number, contact angle, obstacle size and kinematic viscosity ratio on the droplet dynamics after impact are investigated. It was found that the formation of the liquid film around the obstacle, the expansion of the droplet and its rupture time are all affected by these factors. As the Re number increases, the process of droplet falling along the obstacle is faster and the droplet demonstrates a more intense dynamic behavior. Increasing the We number makes the liquid film around the obstacle thinner and more stretched. Hydrophilicity and hydrophobicity of the obstacle surface play a major role in its surface wetting. For the hydrophobic obstacle wall, the separated sub-droplets move more rapidly toward the channel walls. As the hydrophobicity increases, the small droplet left on the upper surface of the obstacle will bounce upward. The bouncing tendency increases as the kinematic viscosity ratio decreases. As the obstacle size increases, the droplet expands more around it and approaches the channel walls faster.

使用高密度比伪势多重弛豫时间LBM对液滴在微通道中的刚性方形障碍物上的撞击进行了数值模拟。研究了雷诺数（Re），韦伯（We）数，接触角，障碍物尺寸和运动粘度比对冲击后液滴动力学的影响。已发现障碍物周围的液膜的形成，液滴的膨胀及其破裂时间均受这些因素影响。随着Re数的增加，液滴沿着障碍物下落的过程会更快，并且液滴表现出更强烈的动态行为。We数的增加使障碍物周围的液膜更薄且更易拉伸。障碍物表面的亲水性和疏水性在其表面润湿中起主要作用。对于疏水性障碍壁，分离的子液滴向通道壁移动更快。随着疏水性的增加，留在障碍物上表面的小液滴将向上反弹。随着运动粘度比的减小，弹跳趋势增加。随着障碍物尺寸的增加，液滴将在其周围扩展更多，并更快地接近通道壁。