Abstract: For studying the collision and coalescence phenomena between liquid inclusions and solid inclusions in liquid steel, a water model experiment was conducted to simulate the process of solid inclusions captured by liquid inclusions. The results show that the main mechanisms on coalescence of droplet and inclusion collision are inertial impaction, intercept capture and wake flow trapping. This is similar to the mechanism of solid inclusions removed by liquid inclusions in molten steel. After the efficiency of capture by inertial impaction and the efficiency of capture by inertial impaction and intercept capture were calculated through the theoretical formula, it is found that the trend of the two is the same basically. The two curves of efficiency are roughly coincident, especially when the droplet diameter is larger. Therefore, it can be concluded that inertial impaction dominates in both approaches, which is consistent with the observed phenomena in the experiment that the most coalescence of droplet and inclusion collision is inertial impaction. The experimental data were analyzed and calculated. It is shown that the efficiency of droplet capturing solid particles is different from the calculated theoretical capture efficiency, but the trend is basically the same. This is because the fluid turbulence is low, the capture efficiency of different droplet diameters is relatively uniform, not as steep as the theoretical curve.