Distributive mixing was studied through different dual-impeller configurations with various impeller size, clearance and types.
It is shown that global circulation patterns within the tank are strongly dependent on relative impeller size and spacing.
It is concluded that obtaining good global circulation and mixing performance is sensitive to relative impeller sizing and spacing.
The scaled size distributions vary with impeller size and impeller speed, in contrast with the near universal scaling known for drop breakup in turbulent flows.
To this end, we have developed a new correlation based on 100 experiments where viscosity, impeller size, agitation speed, and impeller submergence were independently varied.
A variety of different impeller configurations are studied numerically and the effect of relative impeller sizing, impeller spacing and baffling on flow distributions within the stirred vessel is investigated.
On the basis of theoretical analysis, the dimensionless vortex depth was statistically correlated as a function of Froude and Galileo numbers and a relative impeller size.
Liquid viscosity and impeller size variations were reflected in the value of the Galileo number which was within the range 4 × 105 – 5 × 1010.
Using the two-region model, the effect of interfacial tension, viscosity, density and impeller size on the width of the ambivalent range was investigated.
In this work, we present experimental data which suggest that the inversion holdup for sufficiently intense turbulence is independent of all the operational parameters associated with a stirred tank, e.g., stirrer speed, vessel volume, impeller size, and impeller type; it depends only on the properties of the liquid liquid system.
