Abstract
The theories available for the yield stress of magnetic suspensions imply that their transition from a quasi-elastic to a fluid behavior is related to the disruption of chainlike or bulk columnlike aggregates connecting opposite boundaries of a region containing a suspension. It is commonly assumed that aggregates are rigidly bonded to bounding walls. However, a slip of aggregates on the walls is frequently observed. In this work, the transition from an elastic shear strain of a magnetic suspension to its viscous flow due to the slip of aggregates on channel walls is theoretically studied. The value of the corresponding yield stress is estimated.
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