1999
DOI: 10.1021/ie980772s
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Relation between Flow Pattern and Blending in Stirred Tanks

Abstract: In the present work, the relationship between the flow pattern and blending has been investigated. The flow patterns generated by around 40 axial flow impellers have been examined. The impellers differed in blade angle, blade twist, blade width, impeller diameter, impeller location, and pumping direction. The mean-flow and turbulence characteristics generated by all of the impellers have been measured using laser doppler velocimetry (LDV). On the basis of available LDV data, the flow pattern throughout the ves… Show more

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Cited by 112 publications
(96 citation statements)
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“…In some studies flow pattern is analyzed with velocity vectors to show flow direction and velocity field [10] [11] [12]. In Figure 2 the velocity vectors are shown in two horizontal planes, the first at the agitator's level and the second at the tank surface.…”
Section: Resultsmentioning
confidence: 99%
“…In some studies flow pattern is analyzed with velocity vectors to show flow direction and velocity field [10] [11] [12]. In Figure 2 the velocity vectors are shown in two horizontal planes, the first at the agitator's level and the second at the tank surface.…”
Section: Resultsmentioning
confidence: 99%
“…For further comparison, the dimensionless axial and radial circulation or pumping numbers Fl z and Fl r of the two impellers were calculated using the predicted flow field. Primary and secondary pumping numbers Fl z,p and Fl z,s as defined by Patwardhan et al (1999) were calculated for the axial impeller using Eqs. 10 and 11.…”
Section: Resultsmentioning
confidence: 99%
“…The local values of the turbulent viscosity µ t are obtained from the turbulence model, and only the turbulent Schmidt number values must be defined to calculate the turbulent mass diffusivity D jt (Sc t = µ t / ρD jt ). Different Sc t values from 0 to 1 have been used in this study, depending on the flow regime [19]. The mixing simulation was started by instantaneously adding the tracer at the center of the first bend outlet.…”
Section: Boundary Conditions and Numerical Detailsmentioning
confidence: 99%