Aggregation of growing crystals in suspension: II. Poiseuille flow crystalliser
Aggregation of growing crystals in suspension: II. Poiseuille flow crystalliser
复制标题
悬浮液中生长晶体的聚集：II．
DOI：
10.1016/j.ces.2014.10.006
复制
发表时间：
2015
影响因子：
4.7
通讯作者：
Pitt K
中科院分区：
文献类型：
--
作者：
Pitt K
我们描述的Poietille流动结晶器（PFC）的设计和操作，允许直接探索流体动力学和物理化学条件对悬浮液中生长的晶体聚集的影响。PFC作为差分反应器运行，其中入口和出口之间的变化足够小而不会改变速率，但足够大以可测量。自动测量的粒度分布变化产生非常清楚的聚集定量证据。我们使用这些数据来探索洪斯洛等人（2013）的三个开放性问题，并展示如何在整个血管上平均潜在的点聚集动力学以及如何从平均数据中提取点数据。我们引入临界聚集体尺寸D，作为在平均剪切速率下具有Mumtaz数M=1的颗粒尺寸，在对一水草酸钙颗粒的研究中，我们发现D的值可以通过拟合PFC中粒度分布的变化来确定，我们能够区分与聚集有关的候选模型通过经验拟合研究和直接确定聚集效率-容器的平均和非平均效率。结果表明：聚集体破裂发生在简单拉伸条件下，两个碰撞粒子的有效平均尺寸为它们的几何平均值，D2与晶体生长速率与流速的平方之比成正比.我们表明，没有吸引力或排斥力的颗粒间的积极帮助或延缓在这个系统中的聚集。这些结果的比例常数允许控制聚集的材料性质-屈服强度和几何因子与长度尺寸的乘积-被确定为L σY=1.35±0.01 Nm−1。
We describe the design and operation of a Poiseuille Flow Crystalliser (PFC) that allows direct exploration of the effect of hydrodynamic and physico-chemical conditions on the aggregation of crystals growing in suspension. The PFC operates as a differential reactor where changes between inlet and outlet are small enough not to change the rate, but large enough to be measureable. Automatically measured changes in size distribution yield very clear quantitative evidence of aggregation. We use these data to explore the three open questions of Hounslow et al. (2013) and show how to average underlying point aggregation kinetics over a whole vessel and how to extract point data from average data. We introduce the critical aggregate size,D, as the particle size that at the average shear rate has a Mumtaz number,M=1, and so disruptive forces are in balance with the strength of growing bridges.In a study of rounded calcium oxalate monohydrate particles we show that values ofDcan readily be determined by fitting the change in size distribution in the PFC. We are able to discriminate among candidate models relating aggregation efficiency toMby means of an empirical fitting investigation and by directly determining the aggregation efficiency – both averaged and un-averaged for the vessel. We conclude that aggregate rupture happens under simple tension and that the effective average size of two colliding particles is their geometric mean.D2is predicted and observed to be directly proportional to the ratio of crystal growth rate to flow rate squared. We demonstrate that no attractive or repulsive inter-particle forces are active in aiding or retarding aggregation in this system. The constant of proportionality from these results allows the material property controlling aggregation – the product of yield strength and a geometric factor with dimensions of length – to be determined asL⁎σY=1.35±0.01 Nm−1.
悬浮液中生长晶体的聚集：I. Mumtaz 重温
影响因子：
4.7
作者：
Hounslow M
通讯作者：
Hounslow M
提高了 lister 等人离散群体平衡的准确性和收敛性。
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
E. Wynn
通讯作者：
E. Wynn
剪切速率和混合对三水铝石沉淀的单独作用
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
D. Ilievski;M. Rudman;G. Metcalfe
通讯作者：
G. Metcalfe