Zhang Peng, Mines John M, Lee Sungyon, Jung Sunghwan
Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, USA.
Mechanical Engineering, Texas A&M University, College Station, Texas 77843, USA.
Phys Rev E. 2016 Aug;94(2-1):023112. doi: 10.1103/PhysRevE.94.023112. Epub 2016 Aug 22.
Hydrodynamic interactions between air bubbles and particles have wide applications in multiphase separation and reaction processes. In the present work, we explore the fundamental mechanism of such complex processes by studying the collision of a single bubble with a fixed solid particle inside a Hele-Shaw cell. Physical experiments show that an air bubble either splits or slides around the particle depending on the initial transverse distance between the bubble and particle centroids. An air bubble splits into two daughter bubbles at small transverse distances, and slides around the particle at large distances. In order to predict the critical transverse distance that separates these two behaviors, we also develop a theoretical model by estimating the rate of the bubble volume transfer from one side of the particle to the other based on Darcy's law, which is in good agreement with experiments.
气泡与颗粒之间的流体动力学相互作用在多相分离和反应过程中有广泛应用。在本工作中，我们通过研究Hele-Shaw盒内单个气泡与固定固体颗粒的碰撞来探索此类复杂过程的基本机制。物理实验表明，气泡会根据其与颗粒质心之间的初始横向距离，要么分裂，要么绕颗粒滑动。在较小横向距离时，气泡会分裂成两个子气泡，而在较大距离时则会绕颗粒滑动。为了预测区分这两种行为的临界横向距离，我们还基于达西定律，通过估算气泡从颗粒一侧到另一侧的体积转移速率，建立了一个理论模型，该模型与实验结果吻合良好。
