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Dynamics of a bubble impacting and sliding a tilted surface has beeninvestigated through experimental and computational methods.\textcolor{blue}{Specifically, shear stress generated on the wall has beencalculated and compared with bacterium adhesion force in order to evaluate apotential sanitization function. In experiments, the bubble-wall interactionhas been characterized for several different wall angles. We numerically solveda force balance including buoyancy, hydrodynamic inertia \& drag, lift and thinfilm force to determine the bubble motion. Results showed that the shear stressincreases with the wall inclination. The maximum shear stress goes up to morethan 300 Pa as a single bubble impacts and scrubs a tilted wall. We found thatsuch a high shear stress is attributed to a rapid change in thin film curvature(flipping bubble/water interface) during the bouncing stage. Later, during thesliding stage, a smaller shear stress up to around 45 Pa is generated for alonger period of time. We also showed that the shear stress generated duringthe bouncing and sliding stages is high enough to remove bacteria from asurface as a potential method for removing bacteria from tilted surfaces.

Bubble impact on a tilted wall; removing bacteria using bubbles