The shape of non-axisymmetric bubbles on inclined planar surfaces

Bubble-particle interaction is a common phenomenon that is used in numerous industrial applications, and the knowledge of contact angles is important for the description of the expansion of the three-phase contact line. In contrast to drops, the capture of bubbles adhering to a solid surface is an extremely rapid process, and the image quality that can be achieved is worse. For bubble adhesion on a slightly inclined plane, different curvature radii should be considered on the upper and lower bubble sections of the three-phase contact line. The method proposed here is based on the assumption that the ADSA-P approach could be used separately for both bubble parts. motion during the adhesion process was recorded using a high-speed digital camera, and points located on the bubble boundary were detected using image analysis. The bubble was divided into two independent parts, and the ADSA-P technique for contact angles of greater and less than 90° was applied to describe the bubble shape. lculated coordinates of the bubble profile were compared to the experimental data, and an excellent agreement was obtained. The proposed methodology could improve and simplify the description of bubble-particle interactions on non-horizontal surfaces.