Bubbly drag reduction in salty turbulent Taylor Couette flows
Using the Taylor Couette geometry we experimentally investigate the effect of salt on drag reduction caused by bubbles present in the flow. We combine torque measurements with optical high-speed imaging to relate the bubble size to the drag experienced by the flow. In contrast to previous laboratory experiments, which mainly used fresh water, we will vary the salinity from fresh water to the average salinity of ocean water. We will discuss the change in the bubble size and the change in drag reduction when salt is added. We will discuss a variety of salts and the consequences for the practical use of this method of drag reduction.
Contact Nathanael Machicoane for more information or to schedule a discussion with the seminar speaker.