| Issue |
Europhys. Lett.
Volume 69, Number 4, February 2005
|
|
|---|---|---|
| Page(s) | 636 - 642 | |
| Section | Interdisciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i2004-10374-3 | |
| Published online | 14 January 2005 | |
From “discrete” to “continuum” flow in foams
1
LMSGC (UMR113 LCPC-ENPC-CNRS), Institut Navier Champs sur Marne, France
2
Cemagref - Domaine des Palaquins, Montoldre, France
Received:
22
July
2004
Accepted:
3
December
2004
From both NMR and conventional rheometrical data we show that a
foam cannot flow steadily below a critical, apparent shear rate
and a critical shear stress. At low velocities the shear
localizes in a layer of thickness decreasing with the apparent
shear rate. When this thickness becomes smaller than a critical
value 
(about 25 bubble diameters) the continuum
assumption is no longer valid and the apparent behavior in this
“discrete” regime differs from the rheological behavior of the
foam in the “continuum” regime (for a sheared thickness larger
than ).
PACS: 83.80.Iz – Emulsions and foams / 83.10.Gr – Constitutive relations / 83.60.La – Viscoplasticity; yield stress
© EDP Sciences, 2005
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