Dynamics of capillary action

  Figure 5


   Recently, new applications of capillary action in biomedical are considered, including capillary action on bone regeneration technique. In addition, the capillary action is enhanced in plants and trees, and used to in tissue, candle and fountain pen. Also capillary action is responsible for moving groundwater from wet areas of the soil to dry areas.

If a narrow tube is inserted into liquid, the liquid level in the tube will rise or fall from liquid level outside the tube. Capillary action is an ability of fluid to flow into narrow distance opposite of external forces, caused by cohesive forces between the fluids molecules, and adhesive forces between the fluids molecules and solid walls. In this situation there is a gas-liquid-solid interface. This action continues until the combination of cohesive and adhesive forces equals the external forces.

In this study, the wetting property is investigated with setting five different contact angles of the gas-liquid-solid interface. Also, the dynamic capillary height and the pressure variations related to time are presented, and pressure fluctuations related to interface curvature variations is simulated.