论文标题
气泡对在粘剪剪切流体中的流体动力相互作用
Hydrodynamic interaction of a bubble pair in viscoelastic shear-thinning fluids
论文作者
论文摘要
我们实验研究了一对气泡在停滞的粘弹性剪切液中上升的相互作用。特别是，我们专注于气泡大小，跨越速度不连续性的影响，对气泡相互作用。与牛顿液中的起草杀伤量（DKT）行为相比，粘弹性剪切稀释的液体中的气泡展现出来，我们所谓的起草 - 凯西舞（DKD）现象。在舞蹈阶段，气泡对在自由表面上升时反复互换其相对领先和尾随的位置。为了获得进一步的见解，使用粒子图像速度法（PIV）获得气泡对相互作用周围的流场。从实验结果中，我们建议，弹性，可变形性和负唤醒是气泡对之间这种相互作用的原因，从而揭示了在非牛顿液中经常观察到的气泡聚类的基本物理。
We experimentally investigate the interaction between a pair of bubbles ascending in a stagnant viscoelastic shear-thinning fluid. In particular, we focus on the effect of bubble size, across the velocity discontinuity, on the bubble-bubble interaction. Compared to the drafting-kissing-tumbling (DKT) behavior in Newtonian fluid, bubbles in the viscoelastic shear-thinning fluid exhibit, what we call, drafting-kissing-dancing (DKD) phenomenon. In the dancing phase, the bubble pair repeatedly interchange their relative leading and trailing positions as they rise to the free surface. To gain further insights, the flow fields around the bubble pair interaction are obtained using particle image velocimetry (PIV). From the experimental results, we suggest that the elasticity, deformability, and negative wake are responsible for such an interaction between the bubble pair, thus revealing the fundamental physics of bubble clustering often observed in non-Newtonian fluids.
