Parametric effects of bubble-microcantilever impacts in a confined channel

In this study, we have investigated the impact of bubbles with microcantilever obstacles in a confined channel. Static cantilevers of thickness 100μm were considered. Cantilevers were mounted perpendicular to the mean flow in a vertically oriented channel with width of 2mm, span of 10mm, and length of 585mm. Steady, fully developed upward flows with channel Reynolds numbers based on mean fluid velocity and hydraulic diameter of 800–2400 were considered. Bubbles of diameter of 400–2000μm were introduced upstream of the test section, and impacts were observed by using a microscope equipped with a high frame rate camera. Observations were made in planes normal to the length of cantilevers backlit by using white light. Liquid density (ρ), interfacial surface tension (σ), bubble velocity immediately prior to impact (Ububble), bubble diameter (D), obstacle thickness (t), impact offset distance (d), channel width (w), and beam location are all potential influences on the result of bubble-beam impacts. Five dimen...