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Effect of Shear Rate Distribution on Particle Aggregation in a Stirred Vessel
Author(s) -
Masuda Hayato,
Tsuda Kazuto,
Matsui Keisuke,
Komoda Yoshiyuki,
Ohmura Naoto
Publication year - 2017
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201600332
Subject(s) - shear rate , shear (geology) , impeller , simple shear , mechanics , shear flow , particle size , particle size distribution , particle aggregation , aggregate (composite) , materials science , chemistry , composite material , physics , rheology , nanotechnology , nanoparticle
The modeling of particle aggregation under a simple shear flow and the extension of the model to a stirred vessel is described. The model quantitatively demonstrates the change of the number of aggregates with time for each shear rate. This number increased with higher shear rate and, conversely, the aggregate size became small when raising the shear rate. This was because aggregates were broken by the stronger shear force. The number of aggregates for different impellers was determined. The shear rate was back‐calculated from the experimentally obtained aggregate size and the model equation. This shear rate was different from that estimated from the Metzner‐Otto method, consequently, some revisions of the Metzner‐Otto equation might be necessary for its application to particle aggregation.