Zobrazeno 1 - 10
of 267
pro vyhledávání: '"Julio M. Ottino"'
Autor:
Zafir Zaman, Mengqi Yu, Paul P. Park, Julio M. Ottino, Richard M. Lueptow, Paul B. Umbanhowar
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-9 (2018)
Understanding mixing in yield stress materials, such as paint and sand, is complicated due to the coexistence of solid-like and fluid-like regimes. Zaman et al. examine mixing in a granular material in three dimensions and find persistent complex non
Externí odkaz:
https://doaj.org/article/a5442a13436d4dd1b279adcf3f9ad496
Publikováno v:
Physical Review Research, Vol 2, Iss 4, p 042021 (2020)
Size-disperse mixtures of noncohesive particles segregate, or demix, during flow. For spherical particles, mixture segregation can be predicted based on the relative particle diameters. However, most particle systems in industry and geophysics involv
Externí odkaz:
https://doaj.org/article/695f8c97897c4b74a6a9abdcb908361f
Publikováno v:
Physical Review Research, Vol 2, Iss 2, p 022069 (2020)
We computationally determine the net bed force on single spherical intruder particles in dense granular flows as a function of particle size, particle density, shear rate, overburden pressure, and gravity. A simple buoyancy-like scaling law is recove
Externí odkaz:
https://doaj.org/article/67866bd2bec5495b8f89a977c7b3d182
Publikováno v:
AIChE Journal. 69
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5cd5a6aa3a3756cce5ff1f1be910a89
https://doi.org/10.1002/aic.18032
https://doi.org/10.1002/aic.18032
Publikováno v:
Journal of Fluid Mechanics. 948
The drag force on a spherical intruder in dense granular shear flows is studied using discrete element method simulations. Three regimes of the intruder dynamics are observed depending on the magnitude of the drag force (or the corresponding intruder
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::019d6cab6707f6e04c8f03ca54eb5d38
https://doi.org/10.1017/jfm.2022.706
https://doi.org/10.1017/jfm.2022.706
We present a continuum approach to model segregation of size-bidisperse granular materials in unsteady bounded heap flow as a prototype for modeling segregation in other time varying flows. In experiments, a periodically modulated feed rate produces
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1dfd9f742829e93de9ca2ee0f273220
http://arxiv.org/abs/2208.00245
http://arxiv.org/abs/2208.00245
Publikováno v:
Physical review. E. 106(2-1)
Flow of size-bidisperse particle mixtures in a spherical tumbler rotating alternately about two perpendicular axes produces segregation patterns that track the location of nonmixing islands predicted by a dynamical systems approach. To better underst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1afcf7ebf2501722d39aa67cc75ee8e8
https://pubmed.ncbi.nlm.nih.gov/36109991
https://pubmed.ncbi.nlm.nih.gov/36109991
Autor:
Richard M. Lueptow, Vidya Vidyapati, Paul B. Umbanhowar, John Philip Hecht, Julio M. Ottino, Alexander M. Fry
Publikováno v:
Powder Technology. 368:278-285
To apply an existing transport model to industrially relevant granular mixtures and flows, we demonstrate an approach to experimentally measure the segregation coefficient, S, and the flowing layer thickness, δ, using a modified quasi-2D bounded hea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3012530b9e3bbcdce7335171e7447345
https://doi.org/10.1016/j.powtec.2020.04.064
https://doi.org/10.1016/j.powtec.2020.04.064
Publikováno v:
Journal of Fluid Mechanics. 935
Using simulations and a virtual-spring-based approach, we measure the segregation force, $F_{seg},$ in size-bidisperse sphere mixtures over a range of concentrations, particle-size ratios and shear rates to develop a semiempirical model for $F_{seg}$
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5653cfd9f410df841ee41d812b749138
https://doi.org/10.1017/jfm.2022.12
https://doi.org/10.1017/jfm.2022.12
Publikováno v:
Chemical Engineering Science. 260:117840
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a0fe9dc2094f6c22253bd1f92e9a739
https://doi.org/10.1016/j.ces.2022.117840
https://doi.org/10.1016/j.ces.2022.117840