Armoring confined bubbles in the flow of colloidal suspensions.
Armoring confined bubbles in the flow of colloidal suspensions.
复制标题
铠装限制了胶体悬浮液流动中的气泡。
作者：
Y. Yu;S. Khodaparast;H. Stone
研究了在充满胶体悬浮液的水平圆形毛细管中，对长气泡界面进行涂覆的过程。一个典型的细长密闭气泡由三个不同的区域组成：一个球形的前帽，一个由薄液体膜与管壁隔开的中心体，以及一个球形的后帽。这三个地区由过渡段连接起来。颗粒从后到前逐渐覆盖在气泡上。我们研究了控制颗粒初始积累和气泡界面上颗粒覆盖区域生长的机制。我们表明，颗粒的初始积累始于气泡后盖上的稳定滞环，颗粒将完全覆盖气泡后部的球形帽，然后在中心体上积累。用颗粒包裹气泡的中心界面使气泡周围的液膜相对于无颗粒界面周围的液膜增厚。这种效应在气泡中央区域的界面上产生了一个相当尖锐的台阶，将铠装区与无粒子区分开。气泡被完全涂覆后，气泡体周围的液膜将再次调整为中间厚度。结果表明，三种不同厚度的液体膜在装甲过程中可以很好地描述。
We study the process of coating the interface of a long gas bubble, which is translating in a horizontal circular capillary tube filled with a colloidal suspension. A typical elongated confined bubble is comprised of three distinct regions: a spherical front cap, a central body that is separated from the tube wall by a thin liquid film, and a spherical cap at the back. These three regions are connected by transitional sections. Particles gradually coat the bubble from the back to the front. We investigate the mechanisms that govern the initial accumulation of the particles and the growth of the particle-coated area on the interface of the bubble. We show that the initial accumulation of particles starts at the stable stagnation ring on the rear cap of the bubble, and the particles will completely coat the spherical cap at the back of the bubble before accumulating on the central body. Armoring the central interface of the bubble with particles thickens the liquid film around the bubble relative to that around the particle-free interface. This effect creates a rather sharp step on the interface of the bubble in the central region, which separates the armored region from the particle-free region. After the bubble is completely coated, the liquid film around the body of the bubble will adjust again to an intermediate thickness. We show that the three distinct thicknesses that the liquid film acquires during the armoring process can be well described analytically.
DOI：
10.1016/s0735-1097(84)80424-6
发表时间：
1984-01-01
影响因子：
24
作者：
FEINSTEIN, SB;TENCATE, FJ;CORDAY, E
通讯作者：
CORDAY, E