Fig. 6:
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(a) A reconstructed clogged state of elongated particles in a silo based on X-ray tomographic measurement [11]. (b) Normalized critical orifice size Dc/d* vs. grain aspect ratio [9,10]. Above Dc practically no clogging occurs. Here again d* is the equivalent diameter of the particle, which corresponds to the diameter of a sphere with the same volume as the particle.
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