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International Journal of Chemical Engineering
Volume 2012, Article ID 858329, 10 pages
Research Article

Laminar Mixing in Stirred Tank Agitated by an Impeller Inclined

1Department of Chemistry and Chemical Engineering, Yamagata University, Yonezawa 992-8510, Japan
2Process Engineering Laboratory, Corporate R&D Department, Central Research Laboratories, DIC Co., Ltd., Sakura, Chiba 285-8668, Japan

Received 29 February 2012; Revised 18 May 2012; Accepted 18 May 2012

Academic Editor: Naoto Ohmura

Copyright © 2012 Koji Takahashi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The mixing performance in a vessel agitated by an impeller that inclined itself, which is considered one of the typical ways to promote mixing performance by the spatial chaotic mixing, has been investigated experimentally and numerically. The mixing time was measured by the decolorization method and it was found that the inclined impeller could reduce mixing time compared to that obtained by the vertically located impeller in laminar flow region. The effect of eccentric position of inclined impeller on mixing time was also studied and a significant reduction of mixing time was observed. To confirm the experimental results, the velocity profiles were calculated numerically and two novel numerical simulation methods were proposed.