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Effects of type and number of impellers and liquid viscosity on the power characteristics of mechanically agitated gas—liquid systems

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Abstract

Effect of the type and number of high-speed impellers installed on a common shaft on the power characteristics was investigated in water and glucose solutions of different concentration. Different configurations of the Rushton or Smith turbines, pitched blade turbines, propeller, and A 315 impeller were tested. Measurements of power consumption were carried out within the transitional and turbulent regime of the fluid flow using the strain gauge method. Baffled agitated vessels with inner diameter of 0.288 m and 0.634 m were used for the experiments. Liquid height in the vessels was equal to the vessel diameter or it was twice higher. The relative power consumption was compared for different configurations of the impellers.

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Abbreviations

a, b, d o, R :

parameters of the impeller geometrical set-up m

B:

baffle width m

D:

inner diameter of the agitated vessel m

d:

diameter of the agitator m

d d :

diameter of gas sparger m

e:

off-bottom clearance of gas sparger m

Fr:

Froude number (= n 2 d/g)

g:

acceleration of gravity m s−2

H:

liquid height in the agitated vessel m

h 1 :

off-bottom clearance of the lower impeller m

h 2 :

off-bottom clearance of the upper impeller m

Δh :

clearance between the impellers m

i:

number of the agitators

k, l:

model parameters, eqn (2)

Kg:

gas flow number \(( = \dot V_g /nd^3 )\)

n:

agitator speed s−1

Ne o :

power number for the liquid phase (= P o/n 3 d 5 ρ L)

P g :

power consumption for the gas—liquid system W

P o :

power consumption for liquid phase W

Re:

Reynolds number (= nd 2 ρ L/η L)

V L :

volume of the liquid in the vessel m3

\(\dot V_g \) :

gas flow rate m3 s−1

w og :

superficial gas velocity \(( = 4\dot V_g /\pi D^2 )\) m s−1

Z:

number of agitator blades

β:

pitch of the agitator blade °

Δ:

relative error %

η L :

dynamic viscosity of the liquid Pa s

ρ L :

liquid density kg m−3

σ:

surface tension N m−1

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Authors and Affiliations

  1. Department of Chemical Engineering, Faculty of Chemical Engineering, Szczecin University of Technology, PL-71 065, Szczecin, Poland

    R. Adamiak & J. Karcz

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  1. R. Adamiak
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  2. J. Karcz
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Correspondence to J. Karcz.

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Adamiak, R., Karcz, J. Effects of type and number of impellers and liquid viscosity on the power characteristics of mechanically agitated gas—liquid systems. Chem. Pap. 61, 16–23 (2007). https://doi.org/10.2478/s11696-006-0089-6

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  • DOI: https://doi.org/10.2478/s11696-006-0089-6

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