Brazil Nut Effect Easily Explained With Fluidization



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The same effect, on a long time scale is noted in fields subject to freeze-thaw cycles. Large stones and rocks rise to the surface.
As you will immediately notice - momentum effects are not required. Freezing does provide a force which effectively provides some upthrust to the entire substrate - and it is the larger objects which preferentially rise.
How does that sit with your "first real explanation invoving momentum"?
Brian Whatcott Altus OK
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But that's not the same effect. That has nothing to do with large objects impacting packed beds of smaller objects or large objects passing through dispersed beds of smaller objects.

. . .

Perfectly.
Bret Cahill
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