Tomographic Observations of the Flow Around Agitator Impeller

Abstract

standard geometric deviation error function Jn (Ink+ ca2jn) o-/2cV+ l 0(m, s2) = simultaneous distribution of m and s2 I2 = (^/y2)52 o> = M2aV(2cV+l) Literature cited 1) Iinoya, K., H. Masuda and T. Kameda: Preprint of the 3rd Autumn Meeting of the Soc. Chem. Engrs,

Effect of the attack angle on the roll and trailing vortex structures in an agitated vessel with a paddle impeller

“…The roll vortex structure was first reported by Takashima and Mochizuki (1971) and Smith (1973, 1975). Disk-type impellers were used in those experiments.…”

“…The trailing vortex system generated by an impeller in a stirred vessel has been identified as an attractive mechanism for mixing and dispersion processes (pioneering works are: Takashima and Mochizuki, 1971;Smith, 1973, 1975). Some investigators (Yianneskis et al, 1987;Stoots and Calabrese (1995); Derksen et al, 1999) have reported the structure of the trailing vortices generated by a single Rushton impeller with an analysis of angle-resolved laser-Doppler velocimetry (LDV).…”

Vortex Structures around a Flat Paddle Impeller in a Stirred Vessel

“…The dissipation power in the vessel may then be estimated by considering the relationship of the operating conditions of the impeller to the circulation flow rate (4) . According to experimental observations (5) - (7) , roll vortex is formed over the front edge of the paddle as a re-leased vortex sheet, which then rolls up. The vortex is subjected to the centrifugal force of the rotational motion produced by the impeller.…”

“…A pair of vortices is then discharged from the blade tip, forming a trailing vortex. However, these observations have been made only in a visualization study of the flow field (5) . There have been no quantitative measurements to confirm its existence based on the vorticity distribution around the blade.…”

Liquid Flow in Impeller Swept Regions of Baffled and Unbaffled Vessels With a Turbine-Type Agitator

“…Unfortunately, he did not refer to the flow through the path between the impeller blades, limiting application to the flow on the impeller periphery, which corresponds to the exit of the flow path. Almost the only literature related to experimental approaches is a report by Takashima and Mochizuki (1971), who conducted tomographic observations and measurements with a camera rotating with an impeller. Although the local flow around the impeller blades was visualized to be characterized by unique models, the data were not analyzed to permit geometrical modification and design for impellers.…”