van der Graaf S, Nisisako T, Schroën C G P H, van der Sman R G M, Boom R M
Food and Bioprocess Engineering Group, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands.
Langmuir. 2006 Apr 25;22(9):4144-52. doi: 10.1021/la052682f.
We investigated the formation of a droplet from a single pore in a glass chip, which is a model system for droplet formation in membrane emulsification. Droplet formation was simulated with the lattice Boltzmann method, a method suitable for modeling on the mesoscale. We validated the lattice Boltzmann code with several benchmarks such as the flow profile in a rectangular channel, droplet deformation between two shearing plates, and a sessile drop on a plate with different wetting conditions. In all cases, the modeling results were in good agreement with the benchmark. A comparison of experimental droplet formation in a microchannel glass chip showed good quantitative agreement with the modeling results. With this code, droplet formation simulations with various interfacial tensions and various flow rates were performed. All resulting droplet sizes could be correlated quantitatively with the capillary number and the fluxes in the system.
我们研究了玻璃芯片中单个孔形成液滴的过程，该玻璃芯片是膜乳化中液滴形成的模型系统。采用格子玻尔兹曼方法对液滴形成过程进行了模拟，这是一种适用于中尺度建模的方法。我们用几个基准验证了格子玻尔兹曼代码，如矩形通道中的流动剖面、两个剪切板之间的液滴变形以及不同润湿条件下平板上的 sessile 液滴。在所有情况下，建模结果与基准都有很好的一致性。微通道玻璃芯片中实验液滴形成的比较表明与建模结果有良好的定量一致性。利用该代码，进行了不同界面张力和不同流速下的液滴形成模拟。所有得到的液滴尺寸都可以与毛细管数和系统中的通量进行定量关联。
