Drag on a sphere moving through an aging system

@article{tabuteau_07_drag, abstract = {We have investigated the drag on a sphere falling through a clay suspension that has a yield stress and exhibits rheological aging. The drag force increases with both speed and the rest time between the preparation of the system and the start of the experiment, but there exists a non-zero minimum speed below which steady motion is not possible. We find that only a very thin layer of material around the sphere is fluidized when it moves, while the rest of the suspension is deformed elastically. This is in marked contrast to what is found for yield-stress fluids that do not age.}, author = {Tabuteau, H. and Oppong, F. K. and de Bruyn, J. R. and Coussot, P. }, citeulike-article-id = {1659761}, journal = {Europhysics Letters (EPL)}, keywords = {aging, drag, macrorheology, sphere}, number = {6}, posted-at = {2007-09-15 05:04:55}, priority = {2}, title = {Drag on a sphere moving through an aging system}, url = {http://stacks.iop.org/0295-5075/78/68007}, volume = {78}, year = {2007} }

TY - JOUR ID - tabuteau_07_drag L3 - citeulike-article-id:1659761 TI - Drag on a sphere moving through an aging system JF - Europhysics Letters (EPL) VL - 78 IS - 6 N2 - We have investigated the drag on a sphere falling through a clay suspension that has a yield stress and exhibits rheological aging. The drag force increases with both speed and the rest time between the preparation of the system and the start of the experiment, but there exists a non-zero minimum speed below which steady motion is not possible. We find that only a very thin layer of material around the sphere is fluidized when it moves, while the rest of the suspension is deformed elastically. This is in marked contrast to what is found for yield-stress fluids that do not age. KW - aging KW - drag KW - macrorheology KW - sphere AU - Tabuteau, H AU - Oppong, FK AU - de Bruyn, JR AU - Coussot, P PY - 2007/// UR - http://stacks.iop.org/0295-5075/78/68007 ER -