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

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Title: Gas-Liquid Agitation with Closed Turbine Type Impellers Modified for Blade Geometries.
Authors: Yoshida, M.1 myoshida@mmm.muroran-it.ac.jp, Nakata, M.1, Itagaki, K.1, Suganuma, K.1, Kiyota, R.1, Kogami, S.1, Takahashi, Y.1
Source: Chemical & Biochemical Engineering Quarterly. 2025, Vol. 39 Issue 3, p135-142. 8p.
Subjects: Impellers, Gas-liquid interfaces, Turbine blades, Power (Mechanics), Fluid dynamics, Gas mixtures
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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
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. [ABSTRACT FROM AUTHOR]
ISSN:03529568
DOI:10.15255/CABEQ.2025.2426