Particle segregation in inclined high-speed granular flows

We report on the discovery, using numerical simulations, of a segregation pattern in high-speed granular flows, which size is primarily driven by two-dimensional temperature gradients, rather than gravity. In contrast to slower flows gentle slopes, steep large particles no longer accumulate upper layers flow, but are trapped interior. The strong gradients that develop between interior flow and surrounding dilute periphery appear govern mechanism. Interestingly, these new segregated run at much faster speed similar monodisperse flows. This opens up promising perspectives for transporting material with enhanced efficiency. Importantly, we show kinetic theory dense, inclined binary mixtures can provide relevant theoretical framework explain patterns observed simulations.