161 research outputs found
Tracer Dispersion in Rough Open Cracks
Tracer dispersion is studied in an open crack where the two rough crack faces have been translated with respect to each other. The different dispersion regimes encountered in rough-wall Hele-Shaw cell are first introduced, and the geometric dispersion regime in the case of self-affine crack surfaces is treated in detail through perturbation analysis. It is shown that a line of tracer is progressively wrinkled into a self-affine curve with an exponent equal to that of the crack surface.This leads to a global dispersion coefficient which depends on the distance from the tracer inlet, but which is still proportional to the mean advection velocity. Besides, the tracer front is subjected to a local dispersion (as could be revealed by point measurements or echo experiments) very different from the global one. The expression of this anomalous local dispersion coefficient is also obtained
Laminar-turbulent cycles in inclined lock-exchange flows
Peer reviewedPublisher PD
Dynamical Janssen effect on granular packings with moving walls
Apparent mass measurements at the bottom of granular packings inside a
vertical tube in relative motion are reported. They demonstrate that Janssen's
model is valid over a broad range of velocities v. The variability of the
measurements is lower than for static packings and the theoretical exponential
increase of the apparent mass with the height of the packing is precisely
followed (the corresponding characteristic screening length is of the order of
the tube diameter). The limiting apparent mass at large heights is independent
of v and significantly lower than the static value.Comment: 4 pages, 6 figures. accepted for publication in Phys. Rev. Lett.
(2003
Low self-affine exponents of fracture surfaces of glass ceramics
The geometry of post mortem rough fracture surfaces of porous glass ceramics
made of sintered glass beads is shown experimentally to be self-affine with an
exponent zeta=0.40 (0.04) remarkably lower than the 'universal' value zeta=0.8
frequently measured for many materials. This low value of zeta is similar to
that found for sandstone samples of similar micro structure and is also
practically independent on the porosity phi in the range investigated (3% < phi
< 26%) as well as on the bead diameter d and of the crack growth velocity. In
contrast, the roughness amplitude normalized by d increases linearly with phi
while it is still independent, within experimental error, of d and of the crack
propagation velocity. An interpretation of this variation is suggested in terms
of a transition from transgranular to intergranular fracture propagation with
no influence, however, on the exponent zeta.Comment: 4 page
Experimental study of the transport properties of rough self-affine fractures
An experimental study of the transport properties of fluid-saturated joints composed of two complementary rough fracture surfaces, translated with respect to each other and brought in contact, is reported. Quantitative roughness measurements on different fractured granite samples show that the surfaces have a self-affine geometry from which the dependence of the mean aperture on the relative displacement of fracture surfaces kept in contact can be predicted. Variations of the hydraulic and electrical conductances of the joint are measured as functions of its mean aperture. A simple parallel plane model accounts for the global trend of the measurements, but significant deviations are observed when a relative lateral displacement of the surfaces is introduced. A theoretical analysis of their origin shows that they are due both to the randomness of the aperture field and to a nonzero local slope of the surface near the injection hole; the corresponding conductivity fluctuation amplitudes have power law and linear variations with the lateral displacement, and are enhanced by the radial injection geometry
Numerical study of geometrical dispersion in self-affine rough fractures
We report a numerical study of passive tracer dispersion in fractures with rough walls modeled as the space between two complementary self-affine surfaces rigidly translated with respect to each other. Geometrical dispersion due to the disorder of the velocity distribution is computed using the lubrication approximation. Using a spectral perturbative scheme to solve the flow problem and a mapping coordinate method to compute dispersion, we perform extensive ensemble averaged simulations to test theoretical predictions on the dispersion dependence on simple geometrical parameters. We observe the expected quadratic dispersion coefficient dependence on both the mean aperture and the relative shift of the crack as of well as the anomalous dispersion dependence on tracer traveling distance. We also characterize the anisotropy of the dispersion front, which progressively wrinkles into a self-affine curve whose exponent is equal to that of the fracture surface
Flow channelling in a single fracture induced by shear displacement
The effect on the transport properties of fractures of a relative shear
displacement of rough walls with complementary self-affine surfaces
has been studied experimentally and numerically. The shear displacement induces an anisotropy of the aperture field with a correlation length
scaling as and significantly larger in the direction perpendicular to . This reflects the appearance of long range channels perpendicular to resulting in a higher effective permeability for flow in the direction
perpendicular to the shear. Miscible displacements fronts in such fractures are
observed experimentally to display a self affine geometry of characteristic
exponent directly related to that of the rough wall surfaces. A simple model
based on the channelization of the aperture field allows to reproduces the
front geometry when the mean flow is parallel to the channels created by the
shear displacement
Roughness of sandstone fracture surfaces: Profilometry and shadow length investigations
The geometrical properties of fractured sandstone surfaces were studied by measuring the length distribution of the shadows appearing under grazing illumination. Three distinct domains of variation were found: at short length scales a cut-off of self-affinity is observed due to the inter-granular rupture of sandstones, at long length scales, the number of shadows falls off very rapidly because of the non-zero illumination angle and of the finite roughness amplitude. Finally, in the intermediate domain, the shadow length distribution displays a power law decrease with an exponent related to the roughness exponent measured by mechanical profilometry. Moreover, this method is found to be more sensitive to deviations from self-affinity than usual methods
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