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 1997
TL;DR: In this paper, it was shown that if the vessel thickness, l, is much less than the vessel half-width, a (usually l < a/2), then the container may be referred to as a planar or plane type.
Abstract: Particulate materials are stored in vessels which are referred to by different names depending on their geometry; Figure 8.1 shows illustrations of some of the most commonly used. Those containers with a flat bottom are commonly known as ‘bins’ or ‘bunkers’; if the vessel side walls are inclined then the term ‘hopper’ is used. Bins and hoppers can have either axially-symmetric or rectangular cross-section as illustrated in Figure 8.1. With rectangular containers, if the vessel thickness, l, is much less than the vessel half-width, a (usually l < a/2), then the container may be referred to as ‘planar’ or ‘plane’ type. The implication is that when the vessel thickness is quite small, then the geometry is essentially two-dimensional and hence can be approximated by a single plane.
4 citations
Journal Article•
TL;DR: In this article, the influence of commercial modifiers on the flow properties of hydrophobized limestone powders were measured using densimetric measurements with the use of a powder characteristics tester.
Abstract: Limestone powder popularly used as an anti-explosive agent in the mining industry and as an absorbent for exhaust fume desulphurization in the energy industry, both of which take advantage of the powder’s, favourable flow properties. In this project, evaluations of the influence of commercial modifiers on the flow properties of hydrophobized limestone powders were measured. The analysis was carried out on the basis of densimetric measurements with the use of a powder characteristics tester. It was stated that the hydrophobization process improves not only the waterproof properties of limestone powders, but also reduces cohesion and improves flow properties.
4 citations
TL;DR: In this paper, the Neutron Depolarization (ND) technique was used to study in-line particles in a powder sample, which gave a unique insight in the particle rotations and width of the shear zone.
4 citations
01 Jan 2007
TL;DR: In this paper, the authors examined and compared the physical properties of regular and reduced fat (approximately 2% db) in distillers dried grains with solubles (DDGS).
Abstract: Distillers dried grains with solubles (DDGS) are an excellent feed ingredient for ruminant livestock and are used in monogastric rations as well With the remarkable growth of the US fuel ethanol industry in the past decade, large quantities of distillers grains are now being produced Flowability of DDGS has become a problem throughout the industry, as it is often restricted by caking and bridging during storage and transportation As DDGS contains modest levels of corn oil (typically between 3 and 13% db), some studies are being directed at removing the fat from DDGS, to improve the marketability of DDGS by concentrating protein and thus making it more equivalent to other high-protein feeds that are typically used for swine and poultry diets Additionally, the corn oil in DDGS is a ready source of oil for biodiesel production This use for DDGS corn oil can increase the revenue of ethanol processing facilities, and help move them toward a greater diversity of biorefining products Removing oil from DDGS will alter the chemical nature of these coproduct feed materials, and may also affect the physical properties as well In fact, removal of the fat may improve flowability The objective of this study was to examine and compare the physical (moisture, compressive modulus, and shear stress) and flow (Carr and Jenike) properties of regular and reduced fat (approximately 2% db) DDGS The compressive modulus of reduced fat DDGS was higher than unmodified DDGS On the other hand, the compressibility of reduced fat DDGS was less than regular DDGS For regular DDGS, the flow function curve shifted towards the shear stress (sc) axis, which indicated slightly worse flowability Overall, a reduction in the fat content did show some improvement in the flow properties, but many of these differences were not significant As it appears that fat content is not the main driver for DDGS flowability problems, continued research should be pursued, including an examination of the effects of other chemical constituents, as well as particle morphology
3 citations
11 Mar 2011
TL;DR: In this article, experimental data on a well graded angular sand used to investigate the impact of particular design parameters such as sample density and sample height on the arching mechanism was presented. And the relationship between surface and base displacements recorded in the model are also discussed.
Abstract: This paper presents experimental data on a well graded angular sand used to investigate the impact of particular design parameters such as sample density and sample height on the arching mechanism. Soil arching is a natural phenomenon which occurs in all granular soils as a result of stress redistribution. When the trapdoor at the base of the model was released the soil block above the trapdoor settled while the soil block above the supports did not thus shear stresses developed in the fill material between the yielding and unyielding zones. The base of the model was released at two speeds, rapid and gradual, to simulate consolidation of the soft subsoil between piles in a piled embankment and the formation of a sudden void. It was noted that the final load transfer recorded was the same for both the rapid and gradual tests, however there was an initial peak load transfer recorded for the rapid tests. The relationship between surface and base displacements recorded in the model are also discussed.
3 citations