Speaker
Description
Density-driven segregations in rotating drums, well-studied under dry conditions, reveal diverse symmetrical patterns due to variations in heavy and light grain densities (ρh, ρl,) and rotating speeds (<span>ω</span>). Experimentally, we observe a complete segregation state in submerged systems, absent under dry conditions for the same ρh, ρl and <span>ω</span>. Simulations validated by experiments, using coupled computational fluid dynamics and discrete element methods, show that the mixing index can be accurately predicted across a wide range of effective density ratios, D=(ρh-ρf)/(ρl-ρf) is the fluid density. As D increases, systems transition from well-mixed to fully segregated states, accompanied by an increasing number of vortices and more pronounced asymmetry. At higher Reynolds numbers (Re), the vortex area for heavy grains shrinks at lower D, while for light grains, it saturates; at higher D, an additional vortex appears in the light particle zone, expanding continuously. These findings provide new insights into segregation transitions in submerged granular systems and have implications for science and engineering applications.
| Country | Australia |
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