Abstract
The dynamic wetting process of a droplet impacting on a wall is a fascinating phenomenon relative to industrial application such as chemical engineering. However, the wetting detail, especially the characteristics of movement of the triple-phase contact line (TPCL) during impacting is not clear. In this paper, the dynamic behavior of the droplet during impacting was recorded by a high-speed camera, and the dynamic contact angle (DCA) of the droplet and the transient change of the velocity of the TPCL are mainly concerned. This paper will discuss the effects of droplet size, surface wettability, surface microstructure and the inclination angle of the plate on the TPCL movement, separately. Finally, a combined model of the transient force of the droplet on the inclined surface is proposed and verified by experimental data.
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