Storage and Flow of Solids
01 Jan 1964-
About: The article was published on 1964-01-01 and is currently open access. It has received 585 citations till now. The article focuses on the topics: Flow (mathematics).
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01 Jan 1994
TL;DR: For slow flows, energy is lost to Coulomb friction as grains slide across each other as mentioned in this paper, while for rapid flows, particle collisions are inherently inelastic, and the flows are inherently dissipative.
Abstract: Granular flows present a host of interesting problems, both theoretical and experimental. For slow deformations, granular materials are glassy. They contain frozen disorder, and stresses propagate through the material via complex chains of contacts (Drescher et al., 1972; Drescher, 1976; Travers et al., 1986). In this case, granular materials are thought to behave plastically in response to a stress, once some narrow range of elastic response has been exceeded (Jackson, 1983). As the material deforms, contact chains are irreversibly broken and remade. At faster flow rates and lower densities, these materials are better modeled as a gas of particles, exhibiting random fluctuations (Bagnold, 1954; Haff, 1983; Jenkins and Savage, 1983). Unlike the case for large thermodynamic systems, the fluctuation energies can be comparable to the energy associated with large-scale motion. In both scenarios, the flows are inherently dissipative. For slow flows, energy is lost to Coulomb friction as grains slide across each other. For rapid flows, energy is lost because particle collisions are inherently inelastic.
17 citations
TL;DR: In this article, a pilot scale pelletizing system (capacity: 300 kg/h) with integrated die temperature control was built and evaluated using reed canary grass as a model raw material.
17 citations
TL;DR: In this paper, an experimental study was carried out to determine the effect of compaction on arching of wheat flour in storage, and it was observed that the internal friction angles were about the same for the wheat flour at two moisture contents (37.6° vs. 37.5°), but cohesion was 72% higher than that for 8.6% MC.
16 citations
TL;DR: In this paper, the effects of drying temperature (100, 200, and 300°C) and condensed distillers solubles (CDS) level on the resulting flowability behavior of the DDGS particles were investigated.
Abstract: Due to increasing demand for alternative fuels and theneed to reduce dependence on fossil fuels, the growth of bioethanol production has been rising. One of the problems facing this industry is transportation of the coproduct dried distillers grains with solubles (DDGS) over long distances, because caking and agglomeration between particles can lead to bulk flow problems. In this study, DDGS was prepared by combining condensed distillers solubles (CDS) and distillers wet grains (DWG) and then oven drying to achieve 8% (db) moisture content. The effects of drying temperature (100, 200, and 300°C) and CDS (10, 15, and 20%wb ) level on the resulting flowability behavior of the DDGS particles were investigated. Statistical analyses indicated significant differences (α = 0.05, 95% confidence level) due to drying temperature and CDS main effects and significant interaction effects between CDS level and drying temperature for many of the flow parameters. Surface regression analysis of the ratio of total flow ind...
16 citations
TL;DR: In this paper, the influence of injecting nitrogen (N2) gas under high pressure into milk protein concentrate (80%, w/w, protein; MPC) prior to spray drying and examining the physical and bulk handling properties of regular (non-agglomerated) and agglomerated powders was investigated.
16 citations