An official website of the United States government
Dense particulate suspensions demonstrate a significant increase in average viscosity beyond a material-specific critical shear stress. Here, we analyze the steady-state structure of a suspension of monodisperse silica microspheres in the shear-thickening regime. Using dynamic measurement of boundary stress, we show that the flow is characterized by a cluster of high-stress fronts that propagate in the flow direction at a speed of 1/2 relative to the top plate of the rheometer. We apply high-speed line scan imaging to reveal dramatic fluctuations in particle speed, ordering, and concentration associated with the fronts and show that the structure is consistent with transiently jammed networks that contain high interparticle stresses that percolate across the rheometer gap, but which are present only briefly during the passage of the high-stress fronts.
more »
« less
Shear stress tensor and specific shear viscosity of hot hadron gas in nuclear collisions
More Like this
-
-
The stress-strain behavior and liquefaction strength of Ottawa F65 sand was investigated through an extensive series of cyclic direct simple shear (CDSS) tests. The study quantified the effects of static shear stress on the cyclic strength of Ottawa F65 sand. The database of CDSS tests was used to develop an Artificial Neural Networks model to predict Ottawa F65 cyclic strength.more » « less
- Free Publicly Accessible Full Text
-
Accepted Manuscript
- Journal Article:
- https://doi.org/10.1103/PhysRevC.105.014910
