3D simulations of wet foam coarsening evidence a self similar growth regime.
3D simulations of wet foam coarsening evidence a self similar growth regime.
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DOI：
10.1016/j.colsurfa.2015.02.015
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发表时间：
2015-05-20
影响因子：
5.2
通讯作者：
de Almeida, Rita M. C.
中科院分区：
文献类型：
--
作者：
Thomas, Gilberto L.;Belmonte, Julio M.;Graner, Francois;Glazier, James A.;de Almeida, Rita M. C.
在湿液体泡沫中，气体通过气泡壁的缓慢扩散改变了气泡的压力、体积和壁曲率。大气泡的增长是以牺牲小气泡为代价的。气泡越小，收缩得越快。随着一定体积内气泡数量的减少，平均气泡尺寸增大，即泡沫变粗。在粗化过程中，气泡也会相对移动，改变气泡的拓扑结构和形状，而液体会在分离气泡的区域内移动。分析这些机制的综合影响需要检查具有足够气泡的体积，以便在粗化过程中提供适当的统计数据。使用Cellular Potts模型，我们模拟了这些机制在三维泡沫的演变与湿度φ = 0.00, 0.05和0.20。我们将液相表示为许多小流体颗粒的集合，这使我们能够监测气泡之间区域的液体流动。模拟开始于φ = 0.00的2 × 105气泡和φ = 0.05和0.20的1.25 × 105气泡，使我们能够跟踪气泡尺寸，拓扑和增长率在25年体积变化中的分布函数。所有的模拟最终都达到一个自相似的生长状态，分布函数与时间无关，气泡的数量随着时间的推移而减少，其指数取决于湿度。
In wet liquid foams, slow diffusion of gas through bubble walls changes bubble pressure, volume and wall curvature. Large bubbles grow at the expenses of smaller ones. The smaller the bubble, the faster it shrinks. As the number of bubbles in a given volume decreases in time, the average bubble size increases: i.e. the foam coarsens. During coarsening, bubbles also move relative to each other, changing bubble topology and shape, while liquid moves within the regions separating the bubbles. Analyzing the combined effects of these mechanisms requires examining a volume with enough bubbles to provide appropriate statistics throughout coarsening. Using a Cellular Potts model, we simulate these mechanisms during the evolution of three-dimensional foams with wetnesses of ϕ = 0.00, 0.05 and 0.20. We represent the liquid phase as an ensemble of many small fluid particles, which allows us to monitor liquid flow in the region between bubbles. The simulations begin with 2 × 105 bubbles for ϕ = 0.00 and 1.25 × 105 bubbles for ϕ = 0.05 and 0.20, allowing us to track the distribution functions for bubble size, topology and growth rate over two and a half decades of volume change. All simulations eventually reach a self-similar growth regime, with the distribution functions time independent and the number of bubbles decreasing with time as a power law whose exponent depends on the wetness.
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影响因子：
3.2
作者：
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通讯作者：
MULLINS, WW
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