An MRI study of drying in granular beds of nonporous particles
| Autor: | Brian P. Hills, T. A. Carpenter, J.J. Wright, Kevin Michael Wright, Laurance D. Hall |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Friction
Surface Properties Capillary action Diffusion Biomedical Engineering Biophysics Permeability Physics::Fluid Dynamics Surface tension Potential gradient Pressure Surface Tension Radiology Nuclear Medicine and imaging Colloids Desiccation Particle Size Chromatography Chemistry Water Mechanics Magnetic Resonance Imaging Fick's laws of diffusion Microspheres Capillary number Condensed Matter::Soft Condensed Matter Capillary length Models Chemical Food Glass Particle size Gels Porosity Algorithms Capillary Action Gravitation |
| Zdroj: | Magnetic Resonance Imaging. 12:1053-1063 |
| ISSN: | 0730-725X |
| DOI: | 10.1016/0730-725x(94)91237-q |
| Popis: | MRI is used to study the role of capillary and gravitational forces in controlling mass transport of water during isothermal drying of granular beds of nonporous particles. A new model is presented that shows how capillary and gravitational forces relate to Fickian diffusion driven by a chemical potential gradient. In granular beds, where capillary and gravitational forces dominate, the image profiles give direct information on the dependence of the degree of saturation on capillary suction pressure. The effects of changing particle size and surface tension on the profiles is investigated quantitatively, and it is shown that high capillary pressures create anomalies in the drying profiles. |
| Databáze: | OpenAIRE |
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