Flow of Wet Granular Materials

by: N Huang, G Ovarlez, F Bertrand, S Rodts, P Coussot, Daniel Bonn

Physical Review Letters, Vol. 94, No. 2. (2005)

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Abstract

The transition from frictional to lubricated flows of a dense suspension of non-Brownian particles is studied. The pertinent parameter characterizing this transition is the Leighton number Le = , the ratio of lubrication to frictional forces. Le defines a critical shear rate below which no steady flow without localization exists. In the frictional regime the shear flow is localized. The lubricated regime is not simply viscous: the ratio of shear to normal stresses remains constant and the velocity profile has a universal form in both frictional and lubricated regimes. Finally, a discrepancy between local and global measurements of viscosity is identified, which suggests inhomogeneity of the material under flow.

@article{citeulike:2914511, abstract = {The transition from frictional to lubricated flows of a dense suspension of non-Brownian particles is studied. The pertinent parameter characterizing this transition is the Leighton number Le = , the ratio of lubrication to frictional forces. Le defines a critical shear rate below which no steady flow without localization exists. In the frictional regime the shear flow is localized. The lubricated regime is not simply viscous: the ratio of shear to normal stresses remains constant and the velocity profile has a universal form in both frictional and lubricated regimes. Finally, a discrepancy between local and global measurements of viscosity is identified, which suggests inhomogeneity of the material under flow.}, author = {Huang, N. and Ovarlez, G. and Bertrand, F. and Rodts, S. and Coussot, P. and Bonn, Daniel }, citeulike-article-id = {2914511}, doi = {10.1103/PhysRevLett.94.028301}, journal = {Physical Review Letters}, keywords = {2005, bonn, coussot, flow, friction, granular, shear}, number = {2}, posted-at = {2008-06-22 16:39:43}, priority = {2}, publisher = {APS}, title = {Flow of Wet Granular Materials}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000094000002028301000001\&idtype=cvips\&gifs=yes}, volume = {94}, year = {2005} }

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TY - JOUR ID - citeulike:2914511 L3 - citeulike-article-id:2914511 TI - Flow of Wet Granular Materials JF - Physical Review Letters VL - 94 IS - 2 PB - APS N2 - The transition from frictional to lubricated flows of a dense suspension of non-Brownian particles is studied. The pertinent parameter characterizing this transition is the Leighton number Le = , the ratio of lubrication to frictional forces. Le defines a critical shear rate below which no steady flow without localization exists. In the frictional regime the shear flow is localized. The lubricated regime is not simply viscous: the ratio of shear to normal stresses remains constant and the velocity profile has a universal form in both frictional and lubricated regimes. Finally, a discrepancy between local and global measurements of viscosity is identified, which suggests inhomogeneity of the material under flow. KW - 2005 KW - bonn KW - coussot KW - flow KW - friction KW - granular KW - shear AU - Huang, N AU - Ovarlez, G AU - Bertrand, F AU - Rodts, S AU - Coussot, P AU - Bonn, Daniel PY - 2005/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000094000002028301000001&idtype=cvips&gifs=yes ER -

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