Abstract
Power characteristics for an agitated vessel equipped with planar short baffles of length L and pitched blade turbine of pitch β are presented in the paper. The studies were carried out in the vessel of inner diameter D = 0.6 m, where the baffles were located in the distance p from the vessel bottom (p + L = H). Torque was measured using strain gauge method within the turbulent regime of the flow of Newtonian liquid in the agitated vessel. The effects of the pitch β and geometrical parameter p/H on the power number Ne were determined mathematically. The results showed that, for the assumed value of the angle β, the function Ne = f (L/H) decreases with the decrease in the baffle length L (i.e. with the increase in the parameter p). Moreover, for the assumed value of the baffle length L, the function Ne = f (β) increases with the increase in the angle β of the inclination of the impeller blade.
Highlights
IntroductionStudies of the power consumption in the agitated vessel equipped with the short baffles and propeller or different types of the turbines [Rushton turbine (Z = 6); Smith turbine (Z = 6); pitched blade turbine (Z = 3; β = 45o)] were carried out by (Stręk and Karcz 1993 and Karcz and Major 1998)
Liquids of low viscosity are usually agitated in the vessels of inner diameter D, equipped with the high-speed impeller and four (J = 4) planar baffles of width B = 0.1 D and length L = H
A total of 630 experimental data P = f (n) were obtained within the range of the Re ∈ < 3 × 104; 2 × 105 > for the agitated vessel equipped with baffles of length L (L/H ∈ < 1; 0 >; p/H ∈ < 0; 1 >) and pitched blade turbine with the angle β ε < 90o; 30o >
Summary
Studies of the power consumption in the agitated vessel equipped with the short baffles and propeller or different types of the turbines [Rushton turbine (Z = 6); Smith turbine (Z = 6); pitched blade turbine (Z = 3; β = 45o)] were carried out by (Stręk and Karcz 1993 and Karcz and Major 1998). Using method of numerical analysis, Houari Ameur (2016) studied the effect of blade attack angle on the process characteristics for the shear thinning fluid agitated in an un-baffled agitated vessel equipped with two-bladed impeller of blade inclination equal to 45o, 60o, 75o or 90o. The results of the systematic measurements on the power consumption for an agitated vessel with the short baffles and six blade pitched blade turbine (PBT) with various angle β of the blade inclination have been presented. The measurements were taken in the agitated vessel: (1) with the flat bottom, planar
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