Title: Bubbles rising in a crossflow

Description: The figure shows the interaction between rising bubbles and dye injected upstream. The bubbles are created by a reaction between the working fluid (a mixture of hexanoic acid and mineral oil) and sodium embedded in a nonreacting metal plate. The Reynolds number is 350, based on the length of the duct. Along the leading edge of the bubbles, one observes a billowing effect, due to the deformation of the boundary layer profile caused by the rising bubbles and the subsequent growth of the Kelvin-Helmholtz instability. In the closeup, the bubbles interact both in groups and individually with the dye filaments.

Credits: This work was funded by a grant from the U.S. Department of Energy, Environmental Management Science Program.

References: [1] Crepeau, J.C., and McIlroy, H.M. (2005) "Dye-bubble interactions in an open channel flow," Heat and Mass Transfer, 42, 104-111

Web Page: http://teton.if.uidaho.edu/~crepeau/

Contributed By: John Crepeau and Hugh M. McIlroy, Jr.