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Watch the 'We Are Guardians' film #Brazil #Amazon

We Are Guardians | Film
We Are Guardians follows the indigenous forest guardians of the Amazon as they fend off loggers. A global story erupts entwining science, politics & the fate of the Amazon.

The 'Brazil-nut effect' in bidisperse particle laden flow on an incline
Jack Luong, Sarah Cassie Burnett, Andrea L. Bertozzi
https://arxiv.org/abs/2505.24114

The 'Brazil-nut effect' in bidisperse particle laden flow on an incline
We study bidisperse suspensions -- suspensions where there are two particle species of the same density but different sizes -- of a viscous fluid on an incline. We use a lubrication theory/thin film model to form a hyperbolic system of three conservation laws for the height and particle volume fractions. The model predicts, over a range of parameters, that the larger particles rise to the top of the layer, consistent with the well-known `Brazil-nut effect' for granular media. The model predicts…