Experimental observation shows exponential decay in concentration variance of granular flows, suggesting homogenization enhances mixing efficiency.
Granular mixing in continuous flow conditions remains poorly understood. We investigate mixing in a 2D bidisperse granular system stirred by a rod in a chaotic flow; by tracking individual particles, we characterize exponential stretching, a hallmark of chaotic advection. Dispersion analysis reveals that the concentration field variance follows an exponential decay, confirming efficient mixing. Our results establish a link between granular mixing and fluid chaotic advection, suggesting that multidirectional shear enhances dispersion.
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Andrade et al. (2025) studied this question.
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