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The effect of mobility gradients on viscous instabilities in miscible flows in porous media (1999)

Loggia, D. ; Rakotomalala, N. ; Salin, D.

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 11 (1999), S. 740-742

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The onset of viscous instability and the subsequent fingering have been mostly studied under conditions of a sharp mobility contrast. In stable miscible flows in porous media, however, mobility gradients of variable extent can develop due to hydrodynamic dispersion. Graded mobility and density profiles will affect instabilities, either by mitigating (in the case of a monotonic variation) or by enhancing (nonmonotonic variation) the rates of growth. The mitigating effect was exploited by Claridge and Gorrel and Homsy for the optimal design of graded mobility banks. Hickernell and Yortsos showed that in the linear stability limit, the growth rate is controlled by the maximum of the logarithmic derivative of the mobility profile. We present an experimental study of miscible displacements in porous media to study effects of mobility gradients in viscous instability. We take advantage of molecular diffusion in miscible displacements to create a mobility gradient zone and subsequently initiate the instability by increasing the displacement velocity. A theoretical analysis based on linear stability is used to analyze the experimental results. © 1999 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.869943

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Digitale Medien

The effect of dispersion on the stability of non-monotonic mobility profiles in porous media (1998)

Loggia, D. ; Salin, D.

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 10 (1998), S. 747-749

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.869579

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Influence of roughness and dilatancy for dense granular flow along an inclined wall (2000)

Mills, P. ; Tixier, M. ; Loggia, D.

Springer

The European physical journal 1 (2000), S. 5-8

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ISSN: 1292-895X

Schlagwort(e): PACS. 83.70.Fn Granular solids - 45.90.+t Other topics in classical mechanics of discrete systems

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: In a previous work [#!ref1!#], the flow velocity of a steady two-dimensional granular flow along an inclined wall was investigated. The scaling law for the velocity field was found in good agreement with recent experimental results. The purpose of the present paper is to reformulate in more systematic manner and in a somewhat more general context the equations of mass and momentum conservation for dense granular flow, and also to present some new results with particular emphasis on roughness influence and dynamic dilatancy. Theoretical results are found in good agreement with experiments.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s101890050002

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