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Journal of Applied Electrochemistry

, Volume 24, Issue 7, pp 666–669 | Cite as

Determination of local hydrodynamic parameters in bubble columns by the electrodiffusion method with oxygen as depolarizer

  • S. Pannek
  • J. Pauli
  • U. Onken
Papers

Abstract

An electrodiffusional three-segment probe was developed with which local axial and radial liquid velocities can be determined. Application of this probe in gas-liquid flow yields information on local gas hold-up. In coalescing media the commonly used redox-system Fe(CN) 6 3− /Fe(CN) 6 4 should be replaced by dissolved oxygen as depolarizer. Measurements of local axial and radial liquid velocity and turbulence intensity in different bubble columns (D = 150 and 600 mm) showed good agreement with data obtained by hotfilm anemometry.

Keywords

Oxygen Physical Chemistry Dissolve Oxygen Turbulence Intensity Liquid Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

a, b, d, e, h, q

coefficients

c

concentration (mol m−3)

E

potential, voltage (V)

f, g

coefficients (µA, V)

I

current (µA)

I/I0

relative current

k, l

coefficients (µA, W)

M

measuring quantity (µA, W)

P

power (W)

R0

probe resistance (Ω)

S

measuring signal (µA, V)

S228

measuring signal at u = 228 cm s−1 (µA, V)

t

time (s)

u

liquid velocity (cm s−1)

u1

turbulence intensity (cm s-1)

ū

mean liquid velocity (cm s−1)

Θ

flow angle (°)

Nu

Nusselt number

Pr

Prandtl number

Re

Reynolds number

Sc

Schmidt number

Sh

Sherwood number

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References

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • S. Pannek
    • 1
  • J. Pauli
    • 1
  • U. Onken
    • 1
  1. 1.Department of Chemical Engineering, Industrial Chemistry BUniversity of DortmundDortmundGermany

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