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Chemical and Biochemical Engineering Quarterly, Vol. 39 No. 3, 2025.

Original scientific paper

https://doi.org/10.15255/CABEQ.2025.2426

Gas-Liquid Agitation with Closed Turbine Type Impellers Modified for Blade Geometries

M. Yoshida ; Department of Applied Sciences, Muroran Institute of Technology, 27-1, Mizumotocho, Muroran 050-8585, Japan
M. Nakata ; Department of Applied Sciences, Muroran Institute of Technology, 27-1, Mizumotocho, Muroran 050-8585, Japan
K. Itagaki ; Department of Applied Sciences, Muroran Institute of Technology, 27-1, Mizumotocho, Muroran 050-8585, Japan
K. Suganuma ; Department of Applied Sciences, Muroran Institute of Technology, 27-1, Mizumotocho, Muroran 050-8585, Japan
R. Kiyota ; Department of Applied Sciences, Muroran Institute of Technology, 27-1, Mizumotocho, Muroran 050-8585, Japan
S. Kogami ; Department of Applied Sciences, Muroran Institute of Technology, 27-1, Mizumotocho, Muroran 050-8585, Japan
Y. Takahashi ; Department of Applied Sciences, Muroran Institute of Technology, 27-1, Mizumotocho, Muroran 050-8585, Japan

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Abstract

An agitation impeller with shrouded blades—specifically, a closed impeller—was redesigned. A closed impeller originating from a conventional turbine-type impeller was analyzed by considering the internal liquid flow characteristics. As a result, an impeller consisting of six flat blades with radially tapered widths was developed for closed-mode operation. The modified closed impeller (6RTW-FCI) was applied to gas-liquid agitation. The flow behavior of the gas-liquid mixture in the impeller region was examined with energy considerations based on the impeller power characteristics in the gassed liquid. The internal cavities of the 6RTW-FCI generated gas bubbles that moved radially outward due to the accelerated liquid flow produced by the impeller. The power characteristics of the 6RTW-FCI in terms of relative power consumption, which was with no sudden change for various aeration-agitation rates, supported energy conversion through the impeller, resulting in favorable gas-liquid dispersion.







This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

agitation vessel; closed impeller; blade geometries; gas-liquid dispersion; power characteristics

Hrčak ID:

339356

URI

https://hrcak.srce.hr/339356

Publication date:

22.11.2025.

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