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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TL;DR: In this article, the flow of polyhedral granular particles in a small 3D slice hopper is studied experimentally and computationally by applying the discrete element method (DEM), and the experimental packing structure, flow behaviour, arching and discharging in the hopper are analysed and compared with the DEM results for three hopper half angles.
65 citations
TL;DR: Agglomeration behavior of a twin-screw extruder at different material throughputs was investigated and granule porosity was generally influenced by screw element type.
Abstract: Agglomeration behavior of a twin-screw extruder at different material throughputs was investigated. Water insoluble dicalcium phosphate and the binder povidone were agglomerated with demineralized water with five different screw configurations using conveying-, kneading- or combing mixer elements. Increasing material throughput mainly had an effect on the particle size of granules. Due to a higher filling degree of the barrel, the particle size was higher at increased material throughput. Granule porosity was generally influenced by screw element type. With a higher element dispersivity granule porosity and friability decreased. Compression of the different granule batches led to comparable tablet properties. A simple scale up in order to increase batch size can be realized by increasing either production time at given material throughput or material throughput.
65 citations
TL;DR: In this article, the authors used the results of shear failure tests to determine the angle of internal friction of a powder, which is a measure of the difficulty of maintaining the flow of the powder under steady state (constant volume) conditions.
62 citations
TL;DR: In this paper, the size distribution of fragmented nano-powders is characterized by online Scanning Mobility Particle Spectrometer (SMPS) and by offline Scanning Electron Microscopy (SEM).
62 citations
TL;DR: In this article, a screw feeder/lock hopper system was used to feed wood pellets, sawdust, hog fuel and wood shavings into a pilot-scale fluidized-bed gasifier.
Abstract: Successful feeding is critical to biomass utilization processes, but difficult due to the heterogeneity, physical properties and moisture content of the particles. The objectives of the present study were to find the mechanisms of blockage in screw feeding and to determine the effects of particle mean size (0.5–15 mm), size distribution, shape, moisture content (10–60%), density and compressibility on biomass particle feeding at room temperature. Wood pellets, sawdust, hog fuel and wood shavings were tested in a screw feeder/lock hopper system previously employed to feed sawdust into a pilot-scale circulating fluidized-bed gasifier. Experimental results showed that large particles, wide size distributions, large bulk densities and high moisture contents generally led to larger torque requirements for screw feeding. The “choke section” and seal plug play important roles in determining the torque requirements.
62 citations