Bubble interaction with moderate Re crossflow over a cylinder

Bluff-body vortex shedding can appear in offshore structures and heat exchangers. It has been observed that the shedding frequency can be modulated by bubble size and void fraction. However, unexplained scatter in the data exists and the parameter space spanned by Reynolds number, bubble size and void fraction has been understudied. To gain insight on how bubbles of various size interact with the shedding liquid flow, we observe bubble transport at void fractions of α<0.01% and Reynolds number of 8,500-25,000 using pressure-synchronized tomographic bubble tracking and Stereo PIV experiments supplemented by one-way coupled numerical bubble transport studies utilizing 3D LES-generated velocity fields. Analysis and key findings of this investigation are presented.