Newsletter 2019.3 Index
Theme : "Mechanical Engineering Congress, 2019 Japan (MECJ-19)”
This article is concerned with the investigation of the flow past two cylinders arranged in tandem within a microbubble plume inside a tank. Microbubbles with a mean diameter of 0.05 mm are released by water electrolysis from electrodes placed at the bottom of the tank. Upon rising, these microbubbles induce an upward water flow around them due to buoyancy. Orthogonally to the axis of this microbubble plume, two cylinders with a diameter of 30 mm are arranged in tandem. The bubbles and the water flow around the cylinders are visualized. The experiments reveal the water and bubble shear layers originating at the sides of the lower cylinder, and allow the elucidation of their behavior around the upper cylinder. This article also describes the visualization and simulation of the microbubble plume past a cylinder. The simulation successfully grasps the bubble motion and vortical flow of the water.
Microbubble plume, Cylinders in tandem, Separated shear layer, Wake