Experiments in Fluids

, Volume 16, Issue 6, pp 368–374 | Cite as

Sensitivity of three-segment electrodiffusion probes to eddy shedding

  • V. Sobolik
  • J. Tihon
  • J. Pauli
  • U. Onken


The influence of eddy shedding on the instantaneous readings of a three-segment cylindrical electrodiffusion velocity probe was investigated in an immersed jet with a very low turbulence intensity, σ = 1.2%. The velocity fluctuations measured by the three-segment probe were smaller than 2.6%, and the maximum error in the flow angle estimation was 2∘. Vortices with the Strouhal frequency were detected by a simple electrodiffusion probe placed downstream of the three-segment probe, but no peaks with this frequency were found on the frequency spectra of the three-segment probe. From the probe response to a stepwise change of the polarization voltage the characteristic times of the transient process were estimated.


Vortex Characteristic Time Frequency Spectrum Turbulence Intensity Maximum Error 
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List of symbols


parameter in Eq. (1) [A sb m-b]


amplitude gain


parameter in Eq. (1)


parameter in Eq. (3) [A s−1/2]


probe diameter [m]


frequency [s−1]


recording frequency [s−1]


power spectrum


relative current through k-th segment, Eq. (2)


total current [A]


current through k-th segment [A]


number of data samples


Reynolds number, \(Re = vd\rho /\mu \)


Strouhal number, \(Sr = fd/v\)


time [s]


characteristic transient time [s]


jet velocity [m s-1]


time mean value of velocity [m s-1]

vx, y

velocity components measured by probe [m s-1]


variance, var\(\left( x \right) = \sum\limits_{i = 1}^N {\left( {x_1 - x^ - } \right)^2 /N} \)


dynamic viscosity [Pa s]


density [kg m-3]


relative deviation, \(\sigma (x) = 100.(\sqrt {\operatorname{var} (x)/\bar x} \) [%]


flow angle, see Fig. 1


dimensionless frequency


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Copyright information

© Springer Verlag 1994

Authors and Affiliations

  • V. Sobolik
    • 1
  • J. Tihon
    • 1
  • J. Pauli
    • 2
  • U. Onken
    • 2
  1. 1.Academy of Sciences of the Czech RepublicInstitute of Chemical Process FundamentalsPraha 6Czech Republic
  2. 2.Department of Technical Chemistry BUniversity of DortmundDortmundGermany

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