On bed porosity of multisized spheroidal particles.
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2022
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Resumo
In numerous instances of engineering the problem to quantify the porosity of polydisperse
systems arises. Despite its great importance, the theoretical predictability of the bed
porosity is still problematic. In the field of ceramics, classically, Furnas' studies on
porosity are quoted, where he has studied void fraction resulting from blending two
distinct particle sizes in various proportions. Less often, ternary diagrams plotting
porosity isovalues for spherical particles beds are used to characterize ternary mixtures
of distinct monosized particulate systems (usually in ceramics industry). Although similar
studies using polydisperse systems have been conducted, a lot of improvement is yet to
be achieved. This article falls in this context and aims at contributing to this field of
technical and economic impact. Synthetic samples with controlled particle size
distribution were used. The resulting porosity of those glass beads random packs (mimicking several size distributions described by Rosin–Rammler equation) has been
experimentally determined under a standardized compaction level. The main result was
to obtain an equation for the porosity forecast for bead beds inside spheroidal containers,
as a function of the sharpness parameter, n, from Rosin–Rammler distribution. An
accurate extrapolation to systems well described by the Whiten sigmoidal distribution
was achieved as well. A generalization of the Ergun equation is presented at the end of
the article, as an application example.
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Granular media, Rosin–rammler, Random packing, Meio granular, Empacotamento aleatório
Citação
PRADO, D. R. et al. On bed porosity of multisized spheroidal particles. Brazilian Journal of Development, Curitiba, v. 8, n. 2, p. 14217-14237, fev. 2022. Disponível em: <https://brazilianjournals.com/index.php/BRJD/article/view/44486>. Acesso em: 29 abr. 2022.