On the transport of small bubbles under developing channel flow in a buoyant gas-evolving electrochemical cell.

Författare: Wedin, R., Dahlkild, A. A.
Dokumenttyp: Artikel
Tillstånd: Accepterad
Tidskrift: Ind. Eng. Chem. Res.
År: 2001


A gas-evolving electrohemical cell with natural convection due to buoyancy is modelled using a hydrodyamic two-phase mixture model. Physical parameters are taken from the chlorate process, where hydrogen is evolved at the cathode. Constitutive closure laws, based on empirical relations developed for sedimenting particles, gives the motion of the mono-disperse gas phase relative to the mixture. Typical results display the effect of bubble size, channel width and current density on the buoyant flow rate of electrolyte through the channel. Results from the numerical simulations are also compared to data measured by Boissonneau & Byrne (2000) on a cell with gas evolved on both the anode and cathode. A god agreement was found.