Strain Mode of General Flow: Characterization and Implications for Flow Pattern Structures
Strain Mode of General Flow: Characterization and Implications for Flow Pattern Structures
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一般流动的应变模式：流型结构的表征和启示
DOI：
10.1002/aic.15228
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Toshihisa Kajiwara
中科院分区：
文献类型：
--
作者：
Yasuya Nakayama;Tatsunori Masaki;and Toshihisa Kajiwara
根据混合装置的几何形状了解混合装置的混合能力对于预测混合过程和设计新混合器都是一个重要问题。混合器中的流动模式与局部应变率模式直接相关，通常是拉伸流动和平面剪切流动的组合。我们开发了一种措施，以表征模式的应变率发生在混合器中的一般流动。与流型相关的体积应变率（或非平面应变率）的空间分布在理解分布混合中起着至关重要的作用。利用我们的测量方法，对双螺杆挤出机中不同类型螺杆元件的流动进行了数值分析。输送螺杆和捏合盘之间的流型结构的差异成功地表征了体积应变率的分布。结果表明，应变率模态的分布为表征流型结构与混合器几何形状之间的关系提供了一种必要而方便的方法。© 2016美国化学工程师学会AIChE J，62：2563-2569，2016
Understanding the mixing capability of mixing devices based on their geometric shape is an important issue both for predicting mixing processes and for designing new mixers. The flow patterns in mixers are directly connected with the modes of the local strain rate, which is generally a combination of elongational flow and planar shear flow. We develop a measure to characterize the modes of the strain rate for general flow occurring in mixers. The spatial distribution of the volumetric strain rate (or non‐planar strain rate) in connection with the flow pattern plays an essential role in understanding distributive mixing. With our measure, flows with different types of screw elements in a twin‐screw extruder are numerically analyzed. The difference in flow pattern structure between conveying screws and kneading disks is successfully characterized by the distribution of the volumetric strain rate. The results suggest that the distribution of the strain rate mode offers an essential and convenient way for characterization of the relation between flow pattern structure and the mixer geometry. © 2016 American Institute of Chemical EngineersAIChE J, 62: 2563–2569, 2016