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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Visualization of compound drops formation in multiphase processes for the identification of factors influencing bubble and water droplet inclusions in oil drops
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Visualization of compound drops formation in multiphase processes for the identification of factors influencing bubble and water droplet inclusions in oil drops

机译：可视化复合滴形成的多相过程的识别影响因素泡沫和水滴夹杂物在油滴

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摘要

An innovative methodology for visualizing and identifying some mechanisms by which complex structures such as air-in-oil-in-water (A/O/W) and water-in-oil-in-water (W/O/W) may be formed inside mixing tanks dispersing various phases is described. In the case of A/O/W inclusions, isolated inclusion events could be observed by the first time with an experimental setup designed to produce sudden turbulence in a small confined space simulating a three-phase fermentation system. It was observed that high-energy direct-collisions of the bodies are not required for inclusions to occur; rather, a gentle contact between the phases was needed. Then, by maintaining an oil drop in a fixed position while it was impacted by single air bubble, it was feasible to calculate the percentage of air-bubble inclusions into oil drops for different compositions of the continuous phase. By adding biomass as a solid phase, the inclusion occurrence reached 61%; likely this was caused by a mechanical effect of the added biomass (making the interface breakable or unstable) with a minor contribution by the decreased surface tension. In the case of W/O/W, a basic mechanism by which the inclusion of water droplets in oil drops may occur is described. This was derived from the analysis of the hydrodynamic process of the formation of a water drop inside a volume of oil where the differential pressures occurring along the water-oil interface were mapped. This is the first time that factors influencing water and air inclusions in oil drops are identified, and possible mechanisms behind their occurrence are proposed, based on visual evidence.
机译：一个创新的方法和可视化识别一些复杂的机制结构如air-in-oil-in-water (A / O / W)和water-in-oil-in-water (W / O / W)可能形成在混合坦克分散不同阶段描述。孤立的包含事件可以被观察到第一次实验装置设计生产突然波动小密闭空间模拟三相发酵系统。高能direct-collisions尸体不夹杂物发生所需;温柔的阶段之间的联系是必要的。然后,通过维护一个油滴在一个固定的位置是影响单一空气泡沫,计算是可行的气泡夹杂物的比例为石油对不同成分的下降连续相。阶段,包含发生达到61%;可能这是由于机械效应添加生物质(使界面易碎物品或不稳定),由一个小的贡献降低表面张力。一个基本机制包含的水可能发生滴油滴。这是来自的分析水动力水的形成的过程在石油的下降微分压力沿发生油水界面被映射。第一次因素影响水和空气夹杂物在油滴被确定,他们的出现是背后可能的机制提出了基于视觉的证据。

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