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The rotating electrolyser. II. Transport properties and design equations

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Abstract

It is shown that mass transfer in the rotating electrolyser is controlled by the rotational Reynolds number (Re φ) and that species electrogenerated at the wall are confined to a thin layer close to the wall. The radial dispersion coefficient is of the same order as that of a non-rotational, capillary gap cell. Criteria for scale-up are discussed briefly.

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Abbreviations

A :

electrode area

a :

semi-gap

C :

concentration

D r :

radial dispersion coefficient (cm2s−1)

F :

the Faraday

i :

current (A)

j :

current density (A cm−2)

k m :

mass transfer coefficient (cm s−1),k m=i/nFAC

m 1=τ :

normalized first moment of response, defined by Equation 3, equivalent to mean residence time of marked material.

M 2 :

normalized second moment of response, defined by Equation 4

n :

number of electrons transferred

r :

radius

(Re φ):

rotational Reynolds number, defined by (Re φ)=ωr 20 /ν

t :

transit time of plug flow in a radial diffuser, see Equation 5

u :

radial velocity

ū :

average (plug flow) radial velocity

z :

distance measured from axial plane

i:

inner (or denotes marker electrode, as appropriate)

m:

maximum

o:

outer

α:

Taylor number, defined byα 2=a2 ω/ν

τ :

normalized first moment of response, defined by Equation 3, equivalent to mean residence time of marked material

ν :

kinematic viscosity

ω :

angular velocity

References

  1. R. E. W. Jansson, R. J. Marshall and J. E. Rizzo,J. Appl. Electrochem. 8 (1978) 281.

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  3. M. Fleischmann, R. E. W. Jansson and R. J. Marshall, Brit. Prov. Pat. 04939/76 (April 1976).

  4. R. E. W. Jansson and G. A. Ashworth,Electrochim. Acta 22 (1977) 1301.

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  5. R. E. W. Jansson and R. J. Marshall,Chem. Eng. 315 (1976) 769.

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  6. G. A. Ashworth, Ph.D. Thesis, Southampton University (1977).

  7. M. Fleischmann and R. E. W. Jansson,Chem. Ing. Tech. 49 (1977) 283.

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  8. Z. Ibrisagic, Ph.D. Thesis, Southampton University (1977).

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  10. J. Ghoroghchian, Ph.D. Thesis, Southampton University (to be presented).

  11. A. Ferreira, R. E. W. Jansson and R. J. Marshall (to be published).

  12. M. Fleischmann, R. E. W. Jansson and R. J. Marshall (to be published).

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Authors and Affiliations

  1. Chemistry Department, Southampton University, Southampton, UK

    R. E. W. Jansson & R. J. Marshall

Authors
  1. R. E. W. Jansson
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  2. R. J. Marshall
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Jansson, R.E.W., Marshall, R.J. The rotating electrolyser. II. Transport properties and design equations. J Appl Electrochem 8, 287–291 (1978). https://doi.org/10.1007/BF00612681

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  • DOI: https://doi.org/10.1007/BF00612681

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