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Fragmentation of compact polymer-bridged flocs in the laminar taylor vortex flow regime: population balance and breakage function
Chemical Engineering Research and Design ( IF 3.7 ) Pub Date : 2019-11-26 , DOI: 10.1016/j.cherd.2019.11.024
Pek-Ing Au , Wang Yang , Jishan Liu , Yee-Kwong Leong

The breakage or fragmentation kinetic function (FKF) of a given father size floc breaking to form two specific daughter size flocs cannot be measured experimentally. Indirectly it can be determined from the FKF model used to solve the dimensionless log-form population balance (PB) equation for floc fragmentation subjected to meeting three conditions: i) the computed and experimental particle size distribution function (PSDF) matched at all fragmentation time, ii) the PSDF data at zero fragmentation time was the input in the computation and iii) the duration of the experimental fragmentation be used in making the PB equation dimensionless. The fragmentation of compact polyelectrolyte-bridged silica flocs in a narrow gap concentric cylinder flow cell was investigated in the laminar Taylor vortex flow regime. The FKF data was correlated with the Taylor number. The FKF values were much smaller for large flocs as they tend to migrate to the low shear region. Cryo-SEM images of the flocs at different fragmentation times showed compact fractal structure with dimension larger than 2.



中文翻译:

层状泰勒涡流态中致密的聚合物桥接絮凝物的碎裂:种群平衡和破坏功能

给定父亲大小的絮凝物断裂形成两个特定的子代大小的絮凝物的断裂或破碎动力学功能(FKF)无法通过实验测量。可以从FKF模型间接确定,该模型用于解决絮凝物破碎的无量纲对数种群平衡(PB)方程,该方程满足以下三个条件:i)在所有破碎时间都匹配的计算和实验粒度分布函数(PSDF) ,ii)零碎裂时间的PSDF数据是计算中的输入,并且iii)实验碎裂的持续时间用于使PB方程成为无量纲。在层状泰勒涡流流态下,研究了在窄间隙同心圆柱流通池中紧密聚电解质桥连的二氧化硅絮凝物的碎裂情况。FKF数据与泰勒数相关。对于大絮状物,FKF值要小得多,因为它们倾向于迁移到低剪切区。在不同的破碎时间下,絮凝物的Cryo-SEM图像显示出紧凑的分形结构,尺寸大于2。

更新日期:2019-11-26
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