Shape classification of granular materials by rotating cylinder with blades

Nakagawa, Masaru; Furuuchi, Masami; Yamahata, Mayumi; Gotoh, Kunihito; Beddow, J.

doi:10.1016/0032-5910(85)87026-1

Cited by 18 publications

(3 citation statements)

References 6 publications

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“…A primitive approach in the past to inferring crystal morphology was to examine some specific shape-dependent behavior. For example, the rolling tendency of powder in an inclined rotating disk or cylinder and the residence time distribution in sieve cascadograph were used for extracting shape descriptors. − Shape descriptors are scalar quantities that are sensitive to the crystal shape. Although such shape descriptors are only indicators and not a full description of crystal shapes, they have been used in one form or another for controlling product quality in industrial practice.…”

Section: Previous Workmentioning

confidence: 99%

Image-Analysis-Based Method for 3D Crystal Morphology Measurement and Polymorph Identification Using Confocal Microscopy

Singh

Chakraborty

Nere

et al. 2012

Crystal Growth & Design

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A new technique for the measurement of 3D crystal morphology and identification of its polymorph using tomographic images is proposed. Confocal microscopy is used for the first time to obtain tomographic images of crystals that are coated with a suitable fluorescent dye. A convex polyhedron is fitted through a stack of tomographic images of a crystal to obtain the normal vectors of each facet and their corresponding perpendicular distances from the center of the crystal. The angular patterns are generated from the measured normal vectors and are matched with the master angular patterns of each polymorph. It is shown that the matching of the angular patterns is unique and provides a simpler way to identify polymorphs. An image-analysis program that can be integrated with conventional confocal microscopes was created to sequentially perform image processing, morphology measurement, and polymorph detection. This program was used to measure morphologies and identify polymorphs of 2D and 3D acetaminophen crystals. Detailed directions are provided to enable the application of the methodology without the need for special-purpose software. The image-analysis program is also suitable for repeated measurements to produce morphology distributions. This technique will provide an effective platform for measuring the 3D shapes of materials of interest to many applications.

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Section: Previous Workmentioning

confidence: 99%

Image-Analysis-Based Method for 3D Crystal Morphology Measurement and Polymorph Identification Using Confocal Microscopy

Singh

Chakraborty

Nere

et al. 2012

Crystal Growth & Design

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show abstract

“…10 The axial hold-up of hematite and dolomite systems of different particle sizes flowing at 1:1 volume ratios. is desirable such as in balling drums, screening, particulate separation and cement kilns [33][34][35][36][37][38] . Because the exit ends of these units are fully opened and the drums are inclined towards the exit end, the hold up material is small (5-10% of the drum volume) and the mean residence time is short.…”

Section: Minimizing the Segregation Tendencymentioning

confidence: 99%

Flow of Non-Homogeneous Particulates in Rotating Drums

Abouzeid

Fuerstenau

2010

KONA

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Numerous industries deal with particulate systems such as the cement, ceramics, chemical, metallurgical and pharmaceutical industries. Usually the particulate systems handled in these industries are non-homogeneous, that is, their constituents are heterogeneous in their physical properties such as particle size, density, particle shape, and surface roughness. Handling of these systems during transport and/or manufacturing is usually associated with movements of these particulates at transfer points, being shaken, moving through drums, or sliding over inclined planes, which leads to the particulate mass being energized or disturbed. Disturbing such non-homogeneous systems results in mutual separation of the particulate constituents as a result of differences in their physical properties. The mutual separation is a natural phenomenon called segregation. In some instances, segregation is desired, while in most cases it is detrimental. Segregation in particulate systems takes place as a result of several forces, mainly frictional and gravitational forces, acting on the individual particles inside the system while it is energized. It is well known that the contribution of these forces in controlling the movement of particles are functions of the physical properties of the constituting components of the system. This paper concerns investigation and discussion of the mechanisms of particulate motion and the role of the forces acting during energizing a particulate system, particularly while moving through rotating drums, and their effects on the quality of the final products of non-homogeneous particulate systems.

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“…Various shape-dependent properties of powdered solid are measured, and an estimate is obtained from such measurements. For example, flow or magnetic properties often depend on shape and those can be measured to get an estimate of the particle shape. However, actual shape could not be measured using such techniques.…”

Section: Introductionmentioning

confidence: 99%

Measuring the Three-Dimensional Morphology of Crystals Using Regular Reflection of Light

Chakraborty

Sarkar

Singh

et al. 2012

Crystal Growth & Design

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In this paper we present a new technique for measuring the three-dimensional (3D) morphology of faceted crystals. This new technique is based on the observation that a significant amount of regular reflection of light happens from flat crystal faces. Innovative lighting and camera arrangement is used to obtain the photograph of the crystal where a face is highlighted by huge contrast from the background. Such photographs are used to identify the location of the face corners using an in-house method as well as with the well-known Harris corner detector. The in-house method is found to be of comparable efficiency as the Harris detector. Using a simple algorithm, the 3D face coordinates are generated from the two-dimensional face coordinates. Finally, the 3D coordinates of the corners are used to reconstruct the crystal. A consistency check is employed during the reconstruction step which corrects for any missing corner or inconsistent data.

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Shape classification of granular materials by rotating cylinder with blades

Cited by 18 publications

References 6 publications

Image-Analysis-Based Method for 3D Crystal Morphology Measurement and Polymorph Identification Using Confocal Microscopy

Image-Analysis-Based Method for 3D Crystal Morphology Measurement and Polymorph Identification Using Confocal Microscopy

Flow of Non-Homogeneous Particulates in Rotating Drums

Measuring the Three-Dimensional Morphology of Crystals Using Regular Reflection of Light

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