Solid-liquid Mixing in a Stirred Vessel

• MISUMI Ryuta

  横浜国立大学大学院工学研究院

• NISHI Kazuhiko

  横浜国立大学大学院工学研究院

• KAMINOYAMA Meguru

  横浜国立大学大学院工学研究院

Bibliographic Information

Other Title

• 撹拌槽の中の固液の流れ
• 撹絆槽の中の固液の流れ : 槽底からの固体粒子の浮遊と撹絆羽根への粒子衝突
• カクバンソウ ノ ナカ ノ コエキ ノ ナガレ : ソウテイ カラ ノ コタイ リュウシ ノ フユウ ト カクバンハネ エ ノ リュウシ ショウトツ
• （槽底からの固体粒子の浮遊と撹拌羽根への粒子衝突）
• (Particle Suspension from a Vessel Bottom and Particle Collision with Impeller Blades)

Abstract

Solid-liquid mixing in a stirred vessel is widely used in chemical industrial processes, such as crystallization, leaching and chemical reaction by using solid catalysis. In these processes, control of sedimentation of particles on bottom is important to maximize efficiency of the chemical reaction and to prevent particle agglomeration. And particle collision with impeller blades often induces attrition and breakage of particles and erosion of the impeller blade. The mechanism of particle suspension from the vessel bottom and particle collision with impeller blade are not sufficiently understood, mainly because of the difficulties in experiments for characterizing detailed particle behavior.<br>  In this study, the relation between particle rising behavior from a vessel bottom and liquid flow around bottom was clarified by using Computational Fluid Dynamics (CFD) coupled with the Lagrangian simulation of each particle motion. The results show that a common relation of four steps exists between particle rising behavior and fluid flow around bottom among different type of stirred vessels. That is (i) formation of stagnant region on bottom, (ii) sweeping of particles until the stagnant region, (iii) inducement of upward flow above the stagnant region, (iv) particles are caught up in the upward flow. And the particle collision behaviors with impeller blades, such as collision velocity and collision point distribution, were quantified. The results show that, on the front (loading) face of impeller blade, particle collision with large collision velocity concentrates along the blade edge. On the back face, particle collisions mainly occur around the center of blade face.

Journal

• JAPANESE JOURNAL OF MULTIPHASE FLOW

  JAPANESE JOURNAL OF MULTIPHASE FLOW 28 (4), 437-443, 2014

  THE JAPANESE SOCIETY FOR MULTIPHASE FLOW

Keywords

• Solid-liquid mixing
• Stirred vessel
• Impeller blade
• CFD
• Crystallization

Details

• CRID: 1390282679414034176
• NII Article ID: 130004846057
• NII Book ID: AN10088286
• DOI: 10.3811/jjmf.28.437
• ISSN: 18815790
• ISSN: 09142843
• NDL BIB ID: 025994512
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025994512
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed