Abstract

Ionic mass transfer on conical electrodes with axially streaming solutions is studied. The limiting current for different electrochemical systems was dThe influence of the flow rate, the length of the cone, the angle of the cone, the viscosity of the fluid, the diffusivity of the component as well as the ratio of the maximum cone diameter to the width of the channel was determined.The average rate equation under laminar conditions, is expressed by the dimensionless equationShx = 0·80 Rex1/2Sc/13,where X refers either the cone generatrix or the radius of the disk-type electrode chosen as the characteristic length, the Reynolds number being defined by means of the maximum flow rate. Experimental data agree with the theoretical prediction.

Highlights

  • IN PART I1 an equation for the rate of the diffusional flux was given, for systems comprising either fixed disk or cones placed in a channel of infinite width with an axial fluid stream at uniform velocity

  • The relationship provided by the theoretical approach to the problem of ionic mass transfer on conical electrodes[1] as well as by the deduction from the analogous heat-transfer problems is satisfied

  • This is clearly shown when data obtained under very different experimental conditions are satisfactorily correlated with the same rate equation

Read more

Summary

INTRODUCTION

IN PART I1 an equation for the rate of the diffusional flux was given, for systems comprising either fixed disk or cones placed in a channel of infinite width with an axial fluid stream at uniform velocity. K is the mass transfer rate constant in cm/s, Dd is the diffusion coefficient of species i in cm$/s, v is the kinematic viscosity in ems/s, U is the velocity of the incident flux in cm/s, which should be de&red according to the experimental conditions, and X is the characteristic length corresponding either to the cone genera&ix or the radius of the disk. The numerical coefficient of (3) is O-769, very close to the value found through the solution of the mass-transfer differential equation. The flow rate, the length and the angle of the cone, the viscosity of the fluid, the Musivity of the component as well as the ratio of the maximum cone diameter to the width of the channel where the liquid flows, were in due course suitably changed

Electrolysis cell
Working conditions
RESULTS AND INTERPRETATION
The effeci of theflow rate
Injhence of concentration
Correlation of results
CONCLUSIONS
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call