Abstract
The electrochemical method is applied to the determination of mass transfer coefficients between a liquid and opposite circular discs, one of which is rotating, enclosed by a cylinder. Local measurements made at the fixed disc confirm flow schemes proposed in the literature. The global mass transfer coefficients are correlated empirically and compared with a literature correlation for nonelectrochemical data.
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Abbreviations
- C r :
-
radial confinement ratio, C r = R T/R F
- C v :
-
vertical confinement ratio, C v = H/R T
- C ∞ :
-
concentration of ferricyanide ions (mol m−3)
- D :
-
molecular diffusion coefficient of ferricyanide ions (m2 s−1)
- F :
-
Faraday constant (96 500 A s mol−1)
- H :
-
distance between the discs (m)
- i ′ L :
-
local limiting current density (A m−2)
- \(\bar k_{\text{d}} \) :
-
average mass transfer coefficient (m s−1)
- k′d :
-
local frictional mass transfer coefficient (m s−1)
- k d(r):
-
local mass transfer coefficient (m s−1)
- N :
-
rotating disc velocity (r.p.m.)
- r :
-
radial coordinate (m)
- R :
-
radius of disc (m)
- Re H :
-
Reynolds number based on H (= ωH 2/ν)
- Re R :
-
Reynolds number based on R (= ωR 2/ν)
- \(\overline {Sh_{\text{H}} } \) :
-
average Sherwood number based on H (= \(\bar k_{\text{d}} \) d H/D))
- \(\overline {Sh_{\text{R}} } \) :
-
average Sherwood number based on R (= \(\bar k_{\text{d}} \) d R/D)
- s :
-
wall velocity gradient s−1
- Sc :
-
Schmidt number (= ν/D)
- \(\bar \in \) :
-
mean porosity
- ν:
-
kinematic viscosity (m2 s−1)
- νe :
-
number of electrons in the electrode reaction
- ϱ:
-
density, (kg m−3)
- ω:
-
angular velocity (s−1)
- F:
-
at the fixed disc
- T:
-
at the rotating disc
- °:
-
at the disc rotating in an infinite media
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Cavalcanti, E.B., Coeuret, F. Mass transfer between a liquid and a binary rotating/fixed disc system in a closed cylinder. J Appl Electrochem 26, 655–663 (1996). https://doi.org/10.1007/BF00253465
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DOI: https://doi.org/10.1007/BF00253465