PIV measurements of flow in drying polymer solutions during solvent casting
| Autor: | Iman Mansoor, Boris Stoeber |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Fluid Flow and Transfer Processes
chemistry.chemical_classification Materials science Aqueous solution business.industry Computational Mechanics General Physics and Astronomy Polymer Casting Surface tension Viscosity Optics Flow velocity Particle image velocimetry chemistry Mechanics of Materials Thin film Composite material business |
| Zdroj: | Experiments in Fluids. 50:1409-1420 |
| ISSN: | 1432-1114 0723-4864 |
| DOI: | 10.1007/s00348-010-1000-3 |
| Popis: | An experimental method based on confocal microscopy and particle image velocimetry (PIV) is used to characterize the flow in a polymer solution during solvent casting. The flow inside a 200-μm-thick film of a poly(vinyl alcohol) (PVA) solution is visualized near a vertical wall of a mold using confocal microscopy of seed particles during solvent evaporation at 25, 35, and 45°C, and the corresponding velocity vector fields are determined from projections of the confocal images. Flow toward the vertical wall is observed inside the film as well as a slower Marangoni-type counter flow at the film surface during the initial phase of solvent evaporation, resulting from a polymer concentration gradient along the film due to a local variation in evaporation rate. Total volume of the polymer solution in the observation volume as well as solvent evaporation rate are determined as a function of time, both revealing close correlation to average horizontal velocity data from PIV. The PIV measurements show significant differences in the flow velocity fields at different temperatures. The PIV measurements correlate with the solvent evaporation rates as well as the final polymer thicknesses on the vertical wall of the mold. Surface tension and viscosity measurements are taken for different concentrations of PVA solution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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