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Bidisperse Particles on an Incline

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Close-up shot on clear silicone oil with a suspension of large red glass particles and smaller blue glass particles.

A conical cup with a mixture of large red and small blue glass beads in silicone oil. The mixture is settling into three distinct layers: clear oil on top, blue particles in the middle, and red particles at the bottom. Text reads, "A well-mixed slurry in a cup eventualy settles with a layer of smaller particles on top of the larger particles."

As the mixture flows down an incline, the small blue particles settle out first, leaving the red particles to continue. Text reads, "Smaller particles settle out upstream, while larger particles remain in suspension and ultimately aggregate at the front of the fluid."

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