Convection phenomena during the growth of sodium chlorate crystals from solution
| Autor: | William R. Wilcox, Robert A. Lefever, Paul J. Shlichta, Ping Chen |
|---|---|
| Rok vydání: | 1979 |
| Předmět: |
Convection
Supersaturation Chemistry Grashof number Mineralogy Mechanics Condensed Matter Physics Plume Physics::Fluid Dynamics Inorganic Chemistry Boundary layer chemistry.chemical_compound Physics::Atomic and Molecular Clusters Materials Chemistry Streamlines streaklines and pathlines Growth rate Physics::Atmospheric and Oceanic Physics Sodium chlorate |
| Zdroj: | Journal of Crystal Growth. 47:43-60 |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/0022-0248(79)90156-8 |
| Popis: | The paper examines convection phenomena during the growth of sodium chlorate crystals from solution. Schlieren observations of sodium chlorate crystals suspended in supersaturated solutions showed that with increase in supersaturation or crystal size, the boundary layer on the side faces was stable while the top boundary layer and emerging plume changed from stable to partially oscillatory. The transition was a function of the Grashof number, Gr sub top, and the crystal height. Gr sub top correlated with plume width, number of streamlines, eddy density, and plume velocity, but the oscillation period correlated with the weight increase growth rate. The mass transfer rate, the linear growth rate, and growth of vertical and horizontal faces are discussed, and an estimate of boundary layer flow vs growth rate for near-critical stable convection indicated that growth of side faces depleted over half of the excess solute in the boundary layer. Impulse energies greatly in excess of the threshold value caused transient separation of the boundary layer on the top face, and plume wavering due to background-induced fluid motion was observed only at the lowest supersaturations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|