The Secret Physics of Mixed Nuts
Yonatan Zunger

It should be noted that there is also “A Horizontal Brazil-Nut Effect and Its Reverse”, see . From the paper:

“Based on the comparison between experiment and theory we can claim that neither gravity, nor interstitial air, nor surface properties of the spheres, etc., are relevant for the migration. Thus we conclude that the density gradient along the radial direction (high density in the center and low density near the boundary) drives the effects. The more mobile light particles move into dilute areas while heavy ones with large inertia are dragged to dense regions. This is strikingly similar to the usual vertical Brazil-nut effect and its reverse.”

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