The flows of complex fluids link fundamental research questions to potential applications, both in industry and for understanding natural phenomena. In this talk I discuss two research questions that we have studied recently: (1) Although flows at modest Reynolds numbers at a T-shaped junction is a geometry where one should expect everything is known, nevertheless we uncover previously unrecognized complexity in three-dimensional solutions to the Navier-Stokes equations, which rationalize our experimental observations of particle trapping in this common flow configuration. (2) Chemical gradients can drive the motion of colloidal particles, which is a phenomenon known as diffusiophoresis. Although known for many decades, it is often little appreciated. We describe our recent studies of diffusiophoresis in porous systems, including experiments and mathematical modeling. Finally, we show continuous flow designs utilizing diffusiophoresis where particles can be effectively cleaned from water without the use of a filter or membrane.
Speaker: Howard Stone, Princeton Univ.
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