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Light transmission measurement of solute dispersion in non-Brownian suspension flow

Published online by Cambridge University Press:  06 January 2014

Alejandro Boschan ,
Mariana Poblete ,
Yanina Lucrecia Roht ,
Irene Ippolito  and
Ricardo Chertcoff
Alejandro Boschan*
Affiliation:
Grupo de Medios Porosos and CONICET, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, 1063 Buenos Aires, Argentina
Mariana Poblete*
Affiliation:
Grupo de Medios Porosos and CONICET, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, 1063 Buenos Aires, Argentina
Yanina Lucrecia Roht
Affiliation:
Grupo de Medios Porosos and CONICET, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, 1063 Buenos Aires, Argentina
Irene Ippolito
Affiliation:
Grupo de Medios Porosos and CONICET, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, 1063 Buenos Aires, Argentina
Ricardo Chertcoff
Affiliation:
Grupo de Medios Porosos and CONICET, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, 1063 Buenos Aires, Argentina
*
ae-mail: aboschfi@gmail.com
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Abstract

We characterize and employ a light transmission technique to measure the dispersivity of a solute in the flow of a neutrally-buoyant non-Brownian spherical particle suspension in a Hele-Shaw cell (parallelplate axial flow). Particle radii (a) were 20 and 40 μm, the particle bulk volume fraction ϕbulk was 0.2, and the cell aperture was 420 ± 10 μm. In each displacement experiment a suspension with a colouring solute displaces a transparent one at constant flow rates ranging from 0.721 to 0.928 mL/min (corresponding to solute Péclet numbers (Pes) between 350 and 450). A reference measurement, identical to the displacement ones but without particles in the flow (ϕbulk = 0), were performed in the same experimental assembly for comparison purposes. A light calibration related the transmitted intensity I to the solute concentration c for each combination of ϕbulk and a. The time variation of the solute concentration was found to be well-fitted by the solution of the advection-dispersion equation (ADE) in the range of Pes studied, and consequently a dispersion coefficient D and a dispersivity ld of the solute were measured.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 65 , Issue 1 , January 2014 , 11101
Copyright
© EDP Sciences, 2014

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