Cascade of granular flows for characterizing segregation

We propose a method using an original apparatus to amplify any segregation from a granular mixture. The device is a superposition of four Hele Shaw cells for producing a cascade of granular flows that enhances the segregation process. After the flow cascade, the concentration of each granular species is measured in the different cells. From these concentrations, a parameter p that characterizes the ability of the mixture to segregate is calculated. The physical model used to calculate this parameter p is presented. Finally, the method is validated with a series of experiments performed with common granular materials. Relevant parameters behind segregation are evidenced.

Graphical abstractA method based on a flows cascade in successive cells is proposed to measure the ability of a granular mixture to segregates. The flows cascade enhances the segregation process. Then, the concentration of each granular species is measured in the different cells. From these concentrations, a parameter p that characterizes the ability of the mixture to segregate is calculated.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A method is proposed to quantify granular segregation. ► The method is based on a cascade of granular flows. ► A parameter that characterizes the ability of the mixture to segregate is defined. ► The segregation parameter is related to a physical model. ► The method is validated with a series of measurements.