Length scale of density waves in the gravitational flow of fine grains in pipes

Autor(es)

Franklin, Erick de Moraes ^[1] ; Zambrano, Carlos Alvarez ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Fac Mech Engn, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Society of Mechanical Sciences and Engineering; v. 37, n. 5, p. 1507-1513, SEP 2015.
• Citações Web of Science: 2

Resumo

Gravitational flow of grains in pipes is frequently encountered in industry. When the grains and pipes are size-constrained, granular flow may result in density waves consisting of alternate high- and low-compactness regions. This paper discusses the length scale of density waves that appear when fine grains fall vertically in pipes. A one-dimensional model and a linear stability analysis of the model are presented. The analysis suggests the presence of long-wavelength instability for the most unstable mode, moreover, a cutoff wavenumber from which the length scale is estimated. Finally, the model results are compared to experimental data. (AU)

• Processo FAPESP: 12/19562-6 - Transporte de grãos por leito móvel e instabilidades associadas
• Beneficiário: Erick de Moraes Franklin
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores