Strain mode of general flow

Characterization and implications for flow pattern structures

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2563-2569
Number of pages7
JournalAIChE Journal
Volume62
Issue number7
DOIs
Publication statusPublished - Jul 1 2016

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Flow patterns
Strain rate
Equipment and Supplies
Conveying
Extruders
Shear flow
Spatial distribution
Geometry

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Cite this

Strain mode of general flow : Characterization and implications for flow pattern structures. / Nakayama, Yasuya; Kajiwara, Toshihisa; Masaki, Tatsunori.

In: AIChE Journal, Vol. 62, No. 7, 01.07.2016, p. 2563-2569.

Research output: Contribution to journalArticle

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