Abstract

YOSHIDA, Masanori et al. Mixing characteristics of liquid phase in an unbaffled vessel agitated by unsteadily forward-reverse rotating multiple impellers. Lat. Am. appl. res. [online]. 2004, vol.34, n.1, pp.35-40. ISSN 0327-0793.

Mixing characteristics of liquid phase in an unbaffled vessel containing water with a liquid height-to-diameter ratio of 2 agitated by unsteadily forward-reverse rotating multiple impellers, a cross type of impellers with four delta blades (CDs), were experimentally studied in comparison with that in a baffled vessel agitated by steadily unidirectionally rotating disk turbine impellers with six flat blades (DTs). For the forward-reverse as well as unidirectional modes of operation, the mixing time in multiple impeller system was larger than that in single impeller system with a liquid height-to-diameter ratio of 1. The ratio of mixing time in multiple impeller system to that in single impeller system was small for the forward-reverse agitation mode compared with that for the unidirectional agitation mode. The result was discussed in relation to the difference in bulk flow pattern between the unbaffled vessel with forward-reverse rotating CDs and the baffled vessel with unidirectionally rotating DTs.

Keywords : Mixing Time; Unbaffled Agitation Vessel; Unsteadily Forward-Reverse Rotating Impeller; Multiple Impeller System; Bulk Flow Pattern.

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