Particle dispersion in two-dimensional peristaltic flow

Particle dispersion in a two-dimensional peristaltic flow with zero pressure rise is investigated. It is found that depending on the degree of occlusion of the peristalsis, particle motion can be forward or retrograde. Dispersion of a group of particles is quantified using the mean particle position and the variance around this. The degree of occlusion of the wave can be used to promote dispersion of particles and aggregation in the form of a traveling bolus. The efficacy of particle trapping increases with the amplitude ratio. Entrapment and motion of particles within the bolus are studied. The trapped particles arrange themselves in a self-similar manner, as shown in Poincaré sections, which are characterized using the fractal dimension.