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Momentum transfer in an agitated vessel with off-centred impellers

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Abstract

Momentum transfer was investigated in an unbaffled agitated vessel of inner diameter 0.3 m equipped with different off-centred impellers. The distribution of the shear rate on the tank wall as a function of the impeller type and Reynolds number was studied in the turbulent regime of the Newtonian liquid flow. The dependences of the averaged dimensionless shear rate, friction coefficient, and dissipated energy on the Reynolds number and eccentricity ratio were approximated using four-parameter equations.

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Abbreviations

C A0 :

concentration of the component A kmol m−3

D:

inner diameter of the vessel m

D A :

diffusivity of the component A m2 s−1

d:

diameter of the agitator m

e:

eccentricity of the impeller shaft m

F:

Faraday’s constant C kmol−1

f:

friction coefficient

H:

liquid height in the vessel m

h:

off-bottom clearance of the impeller m

I d :

diffusion current A

n:

agitator speed s−1

R:

radius of the agitated vessel (= D/2) m

R k :

radius of cathode m

Re:

Reynolds number (Re = nd 2 ρ/η)

Z:

number of agitator blades

z:

axial coordinate m

z e :

number of electrons taking part in a reaction

ɛ:

dissipated energy W kg−1

γ:

shear rate s−1

η:

dynamic viscosity Pa s

ϕ:

angular coordinate o

ρ:

liquid density kg m−3

τ:

shear stress N m−2

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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

    M. Cudak & J. Karcz

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  1. M. Cudak
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  2. J. Karcz
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Correspondence to J. Karcz.

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Cudak, M., Karcz, J. Momentum transfer in an agitated vessel with off-centred impellers. Chem. Pap. 60, 375–380 (2006). https://doi.org/10.2478/s11696-006-0068-y

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  • DOI: https://doi.org/10.2478/s11696-006-0068-y

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