Bidisperse particle-laden flows down an incline.*

We present experimental and theoretical comparisons of constant flux particle-laden flows down an incline. In particular, we investigate the dynamics of bidisperse slurries - a mixture of viscous fluid and two species of negatively buoyant particles of different densities or sizes. The interplay between shear induced migration and gravitational settling give raise to similar regimes as the previously published constant volume studies. We conduct a systematic set of experiments changing parameters of relevance to produce a phase diagram showing the observed stable regimes. A good agreement is shown between numerical simulations and experimental front tracking and film height measurements. In addition, an interesting observation, where different sized particles settling on the substrate interchange front positions, is presented and discussed.