Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 12, 2022 - November 13, 2022
The drainage and rupture of the thin liquid film formed between a bubble and a flat mica plate have been investigated. It is known that the bubble coalescence can be prevented in electrolyte aqueous solution, and its effects strongly depends on the type of electrolyte. In this study, by using two types of electrolyte aqueous solutions (0.05 M MgSO4 aqueous solution and 0.05 M CH3COONa aqueous solution) and surfactant aqueous solution (10 ppm Triton X-100 aqueous solution), evaluate the effects of impurities on the behavior of the liquid thin film. The effect of the approach velocity also is also evaluated. By using an optical interferometer and a high-speed video camera, interference fringe images are taken, and the shape of the liquid thin film formed between a bubble and a flat mica plate can be obtained. The effect of solute in transition on the thin film process in the center of the liquid film is investigated. Under conditions of 2 mm bubble diameter and the approach velocity of 50 μm/s or less, the thickness of the central film increases, and the spreading of the liquid film is suppressed when electrolytes are added into water.
