Abstract
This paper deals with the experimental determination of the mass transfer rates between the liquid of an agitated vessel and a spherical particle immersed in a reactor. The spatial distribution of the mass transfer coefficients is obtained using an electrochemical method and the influence of the most pertinent hydrodynamic parameters (impeller speed and fluid residence time inside the vessel) is deduced from experimental results. The study considers the two limiting cases of mechanical agitation alone and agitation induced by the liquid jets generated by the feed nozzles. It is shown that knowledge of the specific power dissipated per unit mass of fluid can be useful for the theoretical prediction of the mass transfer rates.
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Abbreviations
- D :
-
molecular diffusion coefficient
- d p :
-
particle diameter
- D i :
-
impeller diameter
- D v :
-
vessel diameter
- E :
-
hydrodynamic parameter defined in Equation 8
- H :
-
vessel height
- k :
-
mass transfer coefficient
- l :
-
characteristic length in Equation 2
- M :
-
mass of liquid in the vessel
- N :
-
rotational speed of agitator
- N p :
-
specific power number
- P :
-
specific power delivered
- Q v :
-
volumetric flow rate of the feed fluid
- S :
-
area for fluid injection
- (Sc):
-
=v/D = liquid Schmidt number
- (Sh):
-
=kd p /D kl/D = Sherwood number
- U :
-
local fluid velocity
- V :
-
vessel volume
- x :
-
vertical distance between the bottom of vessel and the measuring point
- α:
-
coefficient in Equation 2
- ν:
-
kinematic viscosity
- ρ:
-
fluid density
- τ :
-
=V/Q v = residence time in vessel
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Storck, A., Brodberger, J.F., Hutin, D. et al. Mass transfer in agitated vessels: energetic aspects. J Appl Electrochem 11, 727–733 (1981). https://doi.org/10.1007/BF00615177
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DOI: https://doi.org/10.1007/BF00615177