Azimuthally Oscillating Membrane Emulsification for Controlled Droplet Production
Azimuthally Oscillating Membrane Emulsification for Controlled Droplet Production
复制标题
用于受控液滴生产的方位振荡膜乳化
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Bruce Williams
中科院分区：
文献类型：
--
作者：
P. S. Silva;M. Dragosavac;G. Vladisavljević;H. Bandulasena;R. Holdich;M. Stillwell;Bruce Williams
报道了一种新型的膜乳化（ME）系统，由管状金属膜，周期性地方位（切向）振荡的频率高达50 Hz和7 mm的位移，在轻轻的交叉流动的连续相。计算流体动力学（CFD）分析表明，一致的轴向剪切在膜表面，这变得可以忽略不计，在距离膜表面大于0.5 mm。为了比较，CFD分析的一个完全旋转的ME系统显示，在连续相的局部涡流导致可变剪切沿着轴的膜。采用方位振荡膜，实验制备了中位粒径为20-120 μm，液滴尺寸变异系数为8%的水包油乳状液。液滴大小与使用力平衡在膜表面处的剪切应力相关。在连续相的单程中，可以实现40%v/v的高分散相浓度。© 2015 American Institute of Chemical Engineers AIChE J，61：3607-3615，2015
A novel membrane emulsification (ME) system is reported consisting of a tubular metal membrane, periodically azimuthally (tangentially) oscillated with frequencies up to 50 Hz and 7 mm displacement in a gently cross flowing continuous phase. A computational fluid dynamics (CFD) analysis showed consistent axial shear at the membrane surface, which became negligible at distances from the membrane surface greater than 0.5 mm. For comparison, CFD analysis of a fully rotating ME system showed local vortices in the continuous phase leading to a variable shear along the axis of the membrane. Using an azimuthally oscillating membrane, oil-in-water emulsions were experimentally produced with a median diameter of 20–120 μm, and a coefficient of variation of droplet size of 8%. The drop size was correlated with shear stress at the membrane surface using a force balance. In a single pass of continuous phase, it was possible to achieve high dispersed phase concentrations of 40% v/v. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3607–3615, 2015