Mass transfer of dissolved chlorine to a rotating-zinc hemisphere in ZnCl/sub 2/ solution
The chemical reaction of a rotating-zinc hemisphere with dissolved Cl/sub 2/ is mass transfer limited. The diffusion coefficients of dissolved Cl/sub 2/ in various ZnCl/sub 2/ aqueous solutions at 25/sup 0/C were calculated from the weight loss of the rotating Zn hemisphere at various rotational speeds. The Stokes--Einstein equation was confirmed, (D..mu../T) = 4.42 x 10/sup -10/ g cm/sec/sup 2/ /sup 0/K, and can be used to estimate diffusion coefficients of total dissolved Cl/sub 2/ in various ZnCl/sub 2/ solutions. The average Cl/sub 2/ Stokes radius in ZnCl/sub 2/ solution is calculated to be 1.64A. The dissolution rate follows the Levich equation for convection diffusion. Surface roughness is of major importance, and the dissolution rate of Zn increases rapidly at moderate Reynolds number. Spiral markings can be observed on the corroding Zn hemisphere due to instability of the three-dimensional boundary layer, as a result of the increasing surface roughness. 5 figures, 4 tables.
- Research Organization:
- Wayne State Univ., Detroit
- OSTI ID:
- 5124533
- Journal Information:
- J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 125:1; ISSN JESOA
- Country of Publication:
- United States
- Language:
- English
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400201 -- Chemical & Physicochemical Properties
AUTOMOBILES
BATTERY CHARGING
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CHLORIDES
CHLORINE
CHLORINE COMPOUNDS
DIFFUSION
ELECTRIC BATTERIES
ELECTRIC-POWERED VEHICLES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELEMENTS
ENERGY STORAGE
ENERGY STORAGE SYSTEMS
HALIDES
HALOGEN COMPOUNDS
HALOGENS
KINETICS
MASS TRANSFER
MEDIUM TEMPERATURE
METAL-GAS BATTERIES
NONMETALS
OFF-PEAK ENERGY STORAGE
REACTION KINETICS
STORAGE
VEHICLES
ZINC CHLORIDES
ZINC COMPOUNDS
ZINC HALIDES
ZINC-CHLORINE BATTERIES