Hydrodynamic interaction of a bubble pair in viscoelastic shear-thinning fluids

We experimentally investigate the interaction between a pair of bubbles ascending in stagnant viscoelastic shear-thinning fluid. In particular, we focus on effect bubble size, across velocity discontinuity, bubble-bubble interaction. Compared to drafting–kissing–tumbling (DKT) behavior Newtonian fluids, fluid exhibit drafting–kissing–dancing (DKD) phenomenon. dancing phase, repeatedly interchange their relative leading and trailing positions as they rise free surface. To gain further insights, flow fields around are obtained using particle image velocimetry (PIV). From experimental results, suggest that elasticity, deformability, negative wake responsible for such an pair, thus revealing fundamental physics clustering often observed non-Newtonian fluids.