The Capillary Flow and Reorientation of Liquid-Gas Surface in Interior Corner under Microgravity

Abstract

In this study, we try to investigate the capillary flow in interior corner under microgravity condition in drop tower experiments. Especially, the effect of liquid volume on the capillary flow in the container of same size is discussed. The experiments show that the reorientation of the liquid-gas surface is different for the different liquid volumes. The influence of viscosity is also studied. The experimental results show that the climbing speed is larger when the volume is larger. By measuring the angles of contact line with the edge of the container, the time range that tip location is linear with time can be determined properly. For 0.5ml and 0.12ml silicone oil, the tip location is linear with time in the final stage of the microgravity condition in drop tower experiments, and the larger viscosity will make the climbing speed smaller.