Abstract
A fully resolved simulation is performed on the motion of spherical bubbles in homogeneous turbulence subject to a vertical flow that is uniformly sheared in a horizontal direction in order to understand the effect of turbulence on the transverse migration of rising bubbles. It is assumed that bubbles are fully-contaminated by surfactants and can be regarded as light solid particles. An immersed boundary method is adopted to represent a spherical bubble. We focus on the bubbles whose Stokes number based on the Kolmogorov scale is nearly unity. The Galileo number is set in the range of 35–50, for which positive lift is expected in laminar shear flow. Numerical results show that the direction of the mean transverse migration is reversed in turbulence, as in the case of small clean bubbles (Tanaka 2013 J. Phys. Soc. Japan 82, 044401). It is also found that the motion of the bubbles accumulated in the low-speed regions beside vortex layers mainly contributes to the reversal of the direction of the bubble transverse migration.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
