Experiments on jamming with oil droplets instead of photoelastic disks

We use quasi-two-dimensional emulsions as experimental models to study the flow of jammed materials. Our emulsions are oil droplets in water and are compressed between two parallel glass plates so that the droplets are deformed into pancake-like disks. We use microscopy to observe these droplets as they flow. From the deformed outlines of the droplets, we can measure all of the inter-droplet forces to within 10%. In this talk I'll present some of the experiments we've done that were directly inspired by Behringer group experiments, and also briefly mention some recent results on flowing samples.