Turbulent and Laminar Mixings in an Unbaffled Agitated Vessel with an Unsteadily Angularly Oscillating Impeller

For an unbaffled agitated vessel with an angularly oscillating impeller whose rotation continues while periodically reversing its direction at a set angle, the progress of mixing of Newtonian liquid phase was studied experimentally in relation to the impeller power characteristics. Results obtained...

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Bibliographic Details
Published inIndustrial & engineering chemistry research Vol. 48; no. 3; pp. 1665 - 1672
Main Authors Yoshida, Masanori, Nagai, Yasuyuki, Yamagiwa, Kazuaki, Ohkawa, Akira, Tezura, Shuichi
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 04.02.2009
Subjects
Applied sciences
Chemical engineering
Exact sciences and technology
General Research
Mixing
Agitator
Stirred vessel
Mixing
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Summary:For an unbaffled agitated vessel with an angularly oscillating impeller whose rotation continues while periodically reversing its direction at a set angle, the progress of mixing of Newtonian liquid phase was studied experimentally in relation to the impeller power characteristics. Results obtained for the angular oscillation mode of a disk turbine impeller with six flat blades with different amplitudes (Strouhal number) were compared to those obtained for the unidirectional rotation mode of the impeller of identical design. Using an angularly oscillating impeller, turbulent and laminar mixings were effective, respectively, with larger and smaller amplitudes. The mixing characteristics for turbulent and laminar flow regions were discussed on the basis of the flow field features, which the impeller power number reflected.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie801502q