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Mass transfer in an electrochemical reactor with two interacting jets

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Abstract

An electrochemical reactor operated with two identical solution streams injected in opposite directions on the same axis, and leaving it at a normal direction was studied by measuring local and global mass transfer coefficients and visualization of solution flow patterns. This flow configuration was compared to a case where a single stream enters the reactor and leaves it on the same axis. It was found that only the data obtained for the single stream mode can be correlated by the Chilton-Colburn relation, indicating a near laminar boundary layer flow. Global mass transfer coefficients for the single stream mode were found to be slightly higher than those for the interacting jets mode. However, when comparing the two modes by taking into account the dimensionless ratio of the mass transfer coefficient (Sh) to the energy consumption (Eu), it was found that the interacting jets (IJ) mode exhibits a better performance as compared to the single stream mode. The superiority of the IJ mode increases with increasing Reynold's number (Re).

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Abbreviations

A, B :

adjustable parameters

b :

half width of channel

C :

electrolyte ion concentration

d :

inlet pipe diameter

d′ :

microelectrode diameter

D :

diffusion coefficient

\(\overline D _{max} \) :

maximum value of mean deviation

E :

pumping energy

Eu :

Euler number

F :

Faraday number

i :

current to a single microelectrode on an active wall

i′ :

current to a single microelectrode in an inert wall

I :

global diffusion current

k :

mass transfer coefficient to a single microelectrode in an active wall

k′ :

mass transfer coefficient to a single microelectrode in an inert wall

K :

global mass transfer coefficient

Q :

volumetric flow rate

Q T :

total volumetric flow rate

R :

radius of the electrochemical reactor

Re :

Reynolds number

s :

surface area of a microelectrode

S :

surface area of the working electrode

Sc :

Schmidt number

Sh :

Sherwood number

V x :

axial flow velocity alongx-axis

V ∞ :

flow velocity at large distance from the leading edge

V :

mean flow velocity

x :

axis tangential to the surface

y :

axis normal to the surface

z :

number of electrons transferred in the reaction (z=1 in the present case)

μ:

viscosity

ρ:

specific gravity

ν:

kinematic viscosity (μ/ρ)

ΔP :

pressure drop across the reactor

ΔV :

voltage drop across the reactor

ST:

single stream

IJ:

interacting jets

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Author information

Authors and Affiliations

  1. Department of Chemistry, Nuclear Research Center, Negev, P.O. Box 9001, 84190, Beer-Sheva, Israel

    Y. Oren & M. Abda

  2. Department of Chemical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, 84105, Beer-Sheva, Israel

    A. Tamir

Authors
  1. Y. Oren
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  2. M. Abda
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  3. A. Tamir
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Oren, Y., Abda, M. & Tamir, A. Mass transfer in an electrochemical reactor with two interacting jets. J Appl Electrochem 22, 950–958 (1992). https://doi.org/10.1007/BF01024143

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  • DOI: https://doi.org/10.1007/BF01024143

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