Experimental Study of Water Drops with Additive Impact on Wood Surfaces

Experiments of water drops with and without additives impact on wood surfaces were conducted. Three kinds of wood which are Paulownia, Fraxinus mandshurica and Jatoba, were considered, since they are commonly used for architecture and furniture in China. The dynamics of solution drop with additive impact on wood surfaces and the effects of the surface topography on drop spreading were investigated. Comparing to the collision dynamics of a pure water drop, the results show that the additives significantly alter the dynamics of the drop impact on wood surfaces. The maximum and the final spread factor increase as the surface tension decrease. In addition, the surface topography plays an important role on dynamics of liquid drop impact on a solid surface. The drop spreading on different wood surfaces except for Fraxinus mandshurica surface agrees well with the scaling results reported in literature. The grooves comprising in the wood surface can deform the shape of the liquid lamella when the spreading drop reaches the maximum diameter