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 2014
TL;DR: In this paper, a Ubersicht uber Modellvorstellungen zu den Ursachen und uber Experimente zur Ergrundung der relevanten Mechanismen gegeben.
Abstract: Beim Fliesen von Schuttgut in Silos kann es zu Erschutterungen und selbsterregten Schwingungen kommen. Die Frequenz der durch das Schuttgut ausgelosten Schwingungen kann groser als 1 Hz sein, manchmal sogar im horbaren Bereich > 20 Hz liegen, wobei aber gewohnlich kleine Amplituden vorherrschen. Werden horbare Schwingungen erzeugt, spricht man vom „Silohupen“, bei Erschutterungen mit langerem Zeitabstand vom „Silobeben“. Da es keine allgemeingultigen Regeln zum Vermeiden der genannten Effekte gibt, wird eine Ubersicht uber Modellvorstellungen zu den Ursachen und uber Experimente zur Ergrundung der relevanten Mechanismen gegeben. Anhand von Beispielen aus der Literatur werden Problemlosungen vorgestellt.
01 Jan 1987
TL;DR: A bulk solid consists of many particles or granules of different sizes (and possibly different chemical compositions and densities) randomly grouped together to form a bulk as mentioned in this paper, and the nature of such a material is dependent upon many factors, but principally upon the size, shape and density of the constituent particles.
Abstract: A bulk solid consists essentially of many particles or granules of different sizes (and possibly different chemical compositions and densities) randomly grouped together to form of a bulk. The ‘nature’ of such a material—that is, its appearance, its ‘feel’, the way it behaves in various circumstances, and so on— is thus dependent upon many factors, but principally upon the size, shape and density of the constituent particles.
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TL;DR: In this paper, the most commonly used characterization tests that cover a wide range of states are compared: (static, free surface) angle of repose, the (quasi-static, confined) ring shear steady state angle of internal friction, and the (dynamic, free-surface) rotating drum flow angle are considered for free flowing, moderately and strongly cohesive limestone powders.
Abstract: Powders are a special class of granular matter due to the important role of cohesive forces. The flow behavior of powders depends on the flow states and stress and is therefore difficult to measure/quantify with only one experiment. In this study, the most commonly used characterization tests that cover a wide range of states are compared: (static, free surface) angle of repose, the (quasi-static, confined) ring shear steady state angle of internal friction, and the (dynamic, free surface) rotating drum flow angle are considered for free flowing, moderately and strongly cohesive limestone powders. The free flowing powder gives good agreement among all different situations (devices), while the moderately and strongly cohesive powders behave more interestingly. Starting from the flow angle in the rotating drum and going slower, one can extrapolate to the limit of zero rotation rate, but then observes that the angle of repose measured from the heap is considerably larger, possibly due to its special history. When we stretch the ring shear test to its lowest confining stress limit, the steady state angle of internal friction of the cohesive powder coincides with the flow angle (at free surface) in the zero rotation rate limit.