Philos Trans A Math Phys Eng Sci
May 2023
In 1923, the published G. I. Taylor's seminal paper on the stability of what we now call Taylor-Couette flow.
View Article and Find Full Text PDFWe study the percolation of a fine spherical particle under gravity in static randomly packed large-particle beds with different packing densities ϕ and large to fine particle size ratios R ranging from 4 to 7.5 using discrete element method simulations. The particle size ratio at the geometrical trapping threshold, defined by three touching large particles, R_{t}=sqrt[3]/(2-sqrt[3])=6.
View Article and Find Full Text PDFPhilos Trans A Math Phys Eng Sci
March 2023
In 1923, the published G. I. Taylor's seminal paper on the stability of what we now call Taylor-Couette flow.
View Article and Find Full Text PDFFlow of size-bidisperse particle mixtures in a spherical tumbler rotating alternately about two perpendicular axes produces segregation patterns that track the location of nonmixing islands predicted by a dynamical systems approach. To better understand the paradoxical accumulation of large particles in regions defined by barriers to transport, we perform discrete element method (DEM) simulations to visualize the three-dimensional structure of the segregation patterns and track individual particles. Our DEM simulations and modeling results indicate that segregation pattern formation in the biaxial spherical tumbler is due to the interaction of size-driven radial segregation with the weak spanwise component of the advective surface flow.
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