Mixing and transport of particles and droplets co-suspended in a liquid-continuous phase

共悬浮在液体连续相中的颗粒和液滴的混合和传输

• 批准号: RGPIN-2020-04848
• 负责人: Sanders, RSean
• 金额: $ 2.4万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=717285
• 关键词: Mixing; transport; particles; droplets; co

Every day we encounter systems containing droplets and particles. The combination of the two is needed for inkjet printers; the mouth-feel and stability of many food products, like salad dressing or yogurt also depend on them, as does the preparation of many medicines. In these cases, the particles are very small relative to the size of the droplets, so they collect on the droplet surfaces, forming “suits of armour” that make the droplets highly stable. In cases where the particles are larger than the droplets, the behaviour of a system can be totally different, and in fact cannot yet be well predicted. This is especially true in a system where flow or mixing is involved. Some diverse examples include the mixing/reaction process that provides us with many of the common plastics we use, and in the production of crude oil containing water droplets and sand. Under some conditions, the particles contribute to droplet break-up, i.e. the droplets will be smaller than they would be under solids-free conditions. This can make it much more difficult to separate the droplets from the liquid that carries them. Also, the presence of the droplets can make it more difficult to transport the particles, both in terms of the energy required and the ability to keep them from settling. Particle accumulation can lead to pipeline corrosion and failure, since the settled particles trap water near the pipe wall.

我们每天都会遇到含有液滴和颗粒的系统。两者的结合是喷墨打印机所需要的；许多食品（如沙拉酱或酸奶）的口感和稳定性也取决于它们，许多药物的制备也是如此。在这些情况下，颗粒相对于液滴的大小非常小，所以它们聚集在液滴表面，形成“盔甲”，使液滴高度稳定。在粒子比液滴大的情况下，系统的行为可能完全不同，实际上还不能很好地预测。在涉及流动或混合的系统中尤其如此。一些不同的例子包括混合/反应过程，它为我们提供了许多我们使用的常见塑料，以及生产含有水滴和沙子的原油。在某些条件下，颗粒有助于液滴破裂，即液滴将比它们在无固体条件下更小。这使得将液滴从携带液滴的液体中分离出来变得更加困难。此外，液滴的存在会使颗粒的运输变得更加困难，无论是在所需的能量方面，还是在防止它们沉降的能力方面。颗粒积聚会导致管道腐蚀和失效，因为沉淀的颗粒会在管壁附近截留水。