Predicting mixing via resonances: Application to spherical piecewise isometries.

Smith, Lachlan D; Park, Paul P; Umbanhowar, Paul B; Ottino, Julio M; Lueptow, Richard M · Phys Rev E · 2017

basic_science · Level V

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Abstract

We present an analytic method to find the areas of nonmixing regions in orientation-preserving spherical piecewise isometries (PWIs), and apply it to determine the mixing efficacy of a class of spherical PWIs derived from granular flow in a biaxial tumbler. We show that mixing efficacy has a complex distribution across the protocol space, with local minima in mixing efficacy, termed resonances, that can be determined analytically. These resonances are caused by the interaction of two mode-locking-like phenomena.