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Behaviour of gas–liquid mixtures in an unbaffled reactor with unsteadily forward–reverse rotating impellers

✍ Scribed by Masanori Yoshida; Masashi Watanabe; Kazuaki Yamagiwa; Akira Ohkawa; Masahiko Abe; Shuichi Tezura; Masuo Shimazaki

Publisher
Wiley (John Wiley & Sons)
Year
2002
Tongue
English
Weight
352 KB
Volume
77
Category
Article
ISSN
0268-2575

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✦ Synopsis

Abstract

The behaviour of gas–liquid mixtures in the vicinity of the blades of an unsteadily rotating impeller in an unbaffled agitated vessel was studied by observations made with a rotating camera. The impellers used were a disk turbine impeller with six flat blades (DT) and a novel cross‐type impeller with four delta blades (CD). The behaviour of gas–liquid mixtures near the blades of the forward–reverse rotating impeller was unsteady in terms of the formation of cavities behind the blades and their dispersion into gas bubbles, and differed from that near the blades of a unidirectionally, steadily rotating impeller. The differences in relative power consumption between the forward–reverse rotating impellers in the unbaffled vessel and the steadily rotating impellers in the baffled vessel are discussed in relation to the differences in the behaviour of gas–liquid mixtures near the blades of each rotating impeller.

© 2002 Society of Chemical Industry

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