An unbaffled agitated vessel having an unsteadily rotating impeller was employed as an apparatus mixing liquid and solid particles with the density larger than that of liquid. For this type of vessel, the movement of solid particles on the vessel bottom was studied in relation to the liquid flow produced by the impeller. When a disk turbine impeller with six flat blades was rotated in the forward-reverse mode, the liquid flow and the particle movement were visualized. Concurrently, the agitation requirement for complete solid suspension where no particle remains on the vessel bottom for more than a short period and all particles are in motion was determined as a minimum rotation rate of impeller. The liquid flow and the particle movement around a tiny heap of solid particles configured on the vessel bottom were characterized through measurement of their velocities by the particle tracking velocimetry (PTV). The relative velocity of rising with off-bottom suspension of solid particles was uniform in its distribution and wholly large in its magnitude, compared with that in a baffled vessel with a unidirectionally rotating impeller of the identical design, which revealed an effectiveness of this type of vessel as an apparatus for the solid-liquid mass transfer.
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ASME/JSME 2007 5th Joint Fluids Engineering Conference
July 30–August 2, 2007
San Diego, California, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4289-4
PROCEEDINGS PAPER
Movement of Solid Particles on Bottom of an Unbaffled Vessel Agitated by Unsteadily Forward-Reverse Rotating Impeller
Masanori Yoshida,
Masanori Yoshida
Niigata University, Niigata, Japan
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Akihiro Kimura,
Akihiro Kimura
Niigata University, Niigata, Japan
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Kazuaki Yamagiwa,
Kazuaki Yamagiwa
Niigata University, Niigata, Japan
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Akira Ohkawa,
Akira Ohkawa
Niigata University, Niigata, Japan
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Shuichi Tezura
Shuichi Tezura
Shimazaki Mixing Equipment Company, Ltd., Tokyo, Japan
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Masanori Yoshida
Niigata University, Niigata, Japan
Akihiro Kimura
Niigata University, Niigata, Japan
Kazuaki Yamagiwa
Niigata University, Niigata, Japan
Akira Ohkawa
Niigata University, Niigata, Japan
Shuichi Tezura
Shimazaki Mixing Equipment Company, Ltd., Tokyo, Japan
Paper No:
FEDSM2007-37519, pp. 605-610; 6 pages
Published Online:
March 30, 2009
Citation
Yoshida, M, Kimura, A, Yamagiwa, K, Ohkawa, A, & Tezura, S. "Movement of Solid Particles on Bottom of an Unbaffled Vessel Agitated by Unsteadily Forward-Reverse Rotating Impeller." Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference. Volume 2: Fora, Parts A and B. San Diego, California, USA. July 30–August 2, 2007. pp. 605-610. ASME. https://doi.org/10.1115/FEDSM2007-37519
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