Experimental study of solute dispersion in macroscopic suspension flow
We experimentally investigate the influence of suspended neutrally-buoyant particles on the dispersion of a passive solute in pressure-driven axial flow in a constant aperture fracture (parallel plates configuration). A dye is employed as solute in order to measure its local concentration by means o...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/22858 |
| Acceso en línea: | http://hdl.handle.net/11336/22858 |
| Access Level: | acceso abierto |
| Palabra clave: | Suspension Dispersion Solute Transport Particles Flow https://purl.org/becyt/ford/2.7 https://purl.org/becyt/ford/2 |
| Sumario: | We experimentally investigate the influence of suspended neutrally-buoyant particles on the dispersion of a passive solute in pressure-driven axial flow in a constant aperture fracture (parallel plates configuration). A dye is employed as solute in order to measure its local concentration by means of a light transmission technique. In the experiments a dyed particle suspension displaces a transparent one at constant flow rate, for volume fractions ϕ ranging from 0 to 0.25 and for solute Péclet numbers (Pes) between 35 and 476 (mean flow velocities U between 0.004 and 0.0544 cm/s). The local time variation of the solute concentration in the measurement zone was well-fitted by the solution of the advection–dispersion equation, and a longitudinal dispersion coefficient D for the solute was measured. For Pes < 300, the values of D for flow with particles (ϕ > 0) and without particles (ϕ = 0) are equal within the measurement error. For Pes > 300, D decreases for ϕ > 0 compared to ϕ = 0. The magnitude of the reduction increases as ϕ increases, and also as Pes increases. This decrease of D in the presence of suspended macroscopic particles is analyzed in the light of theoretical, numerical and experimental results from other authors that studied suspension flow in similar geometries. |
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