Abstract This paper presents a novel breakage kernel for use in population balance modelling for twin screw granulation (TSG) using mechanistic understanding in different screw elements. Breakage-isolated experiments are conducted using conveying and distributive mixing elements for a range of model formulations of widely different yield stresses. The breakage kernel, i.e. the selection and breakage functions, are mathematically formed based on the identification of the dominant breakage mechanisms of chipping and fragmentation in the conveying and distributive mixing elements, respectively, and the unique geometries of the two screw elements. A parametric study for the proposed breakage kernel is performed to identify the influential parameters on the breakage kernel. This is the first breakage model specifically developed for a TSG and incorporates a mechanistic understanding of several key parameters, particularly the role of screw geometry. The breakage model is well suited to population balance modelling framework for model-driven design of twin screw granulation.

中文翻译：

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用于双螺杆造粒群体平衡建模的破碎内核

摘要 本文提出了一种新的破碎内核，用于利用对不同螺杆元件的机械理解，用于双螺杆造粒 (TSG) 的总体平衡建模。使用输送和分布混合元件进行断裂隔离实验，用于一系列具有广泛不同屈服应力的模型公式。破碎内核，即选择和破碎函数，是基于分别识别输送和分配混合元件中的碎屑和破碎的主要破碎机制，以及两个螺杆元件的独特几何形状而在数学上形成的。对建议的破损核进行参数研究，以确定对破损核的影响参数。这是第一个专门为 TSG 开发的破损模型，并结合了对几个关键参数的机械理解，尤其是螺杆几何形状的作用。破碎模型非常适合用于双螺杆造粒模型驱动设计的群体平衡建模框架。