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1 PublicationAn improved contact method for quantifying the mixing of a binary granular mixture
Papapetrou, T. N.; Lecrivain, G.; Bieberle, M.; Boudouvis, A.; Hampel, U.
Abstract
When two granular phases are brought into motion in a rotating drum, a competition of mixing and segregation occurs. Several image analysis methods have been used to quantify the mixing. In this work, a modification of the contact method, originally proposed by Van Puyvelde (1999), is suggested to allow evaluation of the mixing index for each separate image. A strength of this modified method lies in the removal of the case-dependent normalization of the mixing index, which has so far impaired a direct comparison to other studies. This modified method is tested on artificial and experimental images of a granular bed composed of spherical glass and polypropylene beads of equal size. The bed evolves in a rotating drum under the rolling regime. The temporal evolution of the mixing index is in excellent agreement with the commonly used variance method.
Keywords: binary particle mixing; rotating drum; image analysis; mixing index; contact method; variance method
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Code, data and supplementary material for: An improved contact method for …
ROBIS: 31602 HZDR-primary research data are used by this (Id 31095) publication
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Granular Matter 23(2021), 15
DOI: 10.1007/s10035-020-01073-3
Cited 3 times in Scopus
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