Current density limitation and diffusion boundary layer calculation using CFD method |
| |
Authors: | A Filzwieser K Hein G Mori |
| |
Affiliation: | (1) RHI AG, Wienerbergstrasse 11, A-1100 Vienna, Austria;(2) Technical University Freiberg, University of Leoben, Freiberg, Germany;(3) University of Leoben, Freiberg, Germany |
| |
Abstract: | The knowledge of limiting current density and thickness of diffusion boundary layer is particularly important in improving
space-time-yield of electrolysis and especially of high current-density electrolysis. Both natural and forced convection of
electrolyte flow are considered in the presented computational fluid dynamics model for calculation of these values. Natural
convection is modeled by implementation of a source term at the cathode surface for copper concentration according to Faraday’s
law, which allows calculation of electrolyte density for each volume cell of the grid. Forced convection is considered as
flow of electrolyte through the cell generated by electrolyte inlet and outlet. By variation of current density, the limiting
current density can be calculated with a copperion concentration of zero at the cathode surface after reaching the steady-state
conditions in electrolyte. Time dependency of diffusion boundary layer thickness is shown for a chosen cell geometry. Literature
data and measured and calculated values of both quantities are in good agreement. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|