Quantifying Effects of Particulate Properties on Powder Flow Properties Using a Ring Shear Tester

Hou, Hao; Sun, Changquan Calvin

doi:10.1002/jps.21288

Cited by 134 publications

(70 citation statements)

References 21 publications

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“…They found that increasing particle size improves flow properties as a result of reduction in specific surface area of contacts, the van der Waal's forces and the H-bonding between particles. The effect of bulk density was not discernible, however, by normalising the unconfined yield strength with respect to bulk density they found that powders with higher bulk density flow better [33]. This is consistent with the critical orifice results in Table 2.…”

Section: Flow Properties Using Existing Methodssupporting

confidence: 79%

“…The standard deviation for the angle of repose data presented in Table 2 is between 0.29° -1.4°. 50mm 75mm 100mm PH101 341 30 45 45 44 PH102 320 26 39 40 39 PH200 361 11 33 34 33 PH302 442 24 46 45 43 The critical orifice diameter measurements in Table 2 provide the same ranking order of microcrystalline cellulose powders in terms of flowability as the results published by Hou et al [33] obtained using a ring shear cell testing. They found that increasing particle size improves flow properties as a result of reduction in specific surface area of contacts, the van der Waal's forces and the H-bonding between particles.…”

Section: Flow Properties Using Existing Methodssupporting

confidence: 54%

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Vacuum assisted flow initiation in arching powders

2016

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Graphical abstract Highlights• Vacuum applied at the exit of an arching hopper assists flow initiation.• A small reduction of pressure changes the critical orifice diameter significantly.• A dimensional model was developed to predict the pressure required to initiate flow. 2 AbstractThe discharge of powders from hoppers usually takes place in open atmosphere. However, in powder pressing industries (e.g. manufacturing of pharmaceutical tablets, detergents, ceramics, powder metallurgy etc.) there are handling operations where powders are filled into closed cavities such as dies. During this process the air pressure is increased as powder is delivered into the die. At the same time typical tablet production equipment creates a suction effect. A critical orifice measurement apparatus was developed to study powder flow initiation from an arching state into an enclosure where the air pressure is reduced. It was shown that a very small reduction of pressure changed the critical orifice diameter significantly. Dimensional analysis was carried out to relate powder properties (particle size and density) and processing parameters (geometry of the system and differential pressure necessary to break the arch). A relationship was developed to calculate the pressure difference necessary to initiate powder flow. The relationship has two empirical parameters which are calibrated by performing simple experiments using the testing rig developed.

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Section: Flow Properties Using Existing Methodssupporting

confidence: 79%

Section: Flow Properties Using Existing Methodssupporting

confidence: 54%

Vacuum assisted flow initiation in arching powders

2016

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“…Indirect methods include, e.g., angles of repose, shear cell determinations (5,8,11,13,14), and measurements of critical orifice diameter (10,(15)(16)(17)(18). Recently, flow properties of powders were measured using a more advanced ring shear cell tester which makes it possible to substantially reduce the amount of powder and labor required to characterize flow properties (19,20). Determination of a ratio of bulk and tap density (i.e., Carr's compressibility index or Hausner's ratio which have a correlation to flowability) has been also exploited as an indirect method in assessment of powder flow.…”

Section: Introductionmentioning

confidence: 99%

Development of a New Method to Get a Reliable Powder Flow Characteristics Using Only 1 to 2 g of Powder

et al. 2010

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Abstract. In powder technology, it is often important to directly measure real powder flow rate from a small amount of powder. For example, in pharmaceutical industry, a frequent problem is to determine powder flow properties of new active pharmaceutical ingredient (API) in an early stage of the development when the amount of API is limited. The purpose of this paper is to introduce a new direct method to measure powder flow when the material is poorly flowing (cohesive) and the amount of material is about 1 to 2 g. The measuring system was simple, consisting of a flow chamber and electronic balance and an automated optical detection system, and for each measurement, only 1 to 2 g of sample was required. Based on the results obtained with this testing method, three selected sugar excipients, three grades of microcrystalline cellulose, and APIs (caffeine, carbamazepine, and paracetamol) can be classified as freely flowing, intermediate flowing, and poorly flowing powders, respectively. The average relative standard deviation for the flow time determinations was not more than 2-10%. The present novel flowability testing method provides a new tool for a rapid determination of flowing characteristics of powders (e.g., inhalation powders) and granules at a small scale.

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“…Moreover, many other measurement techniques such as Carr's index, Hall flowmeter, shear cell and powder rheometer, also provides powder flow properties [12,13]. Though the relationship between particle shape and flow characteristics has not been extensively studied, the samples studied are mostly limited to spherical/ spheroidal particles [14]. The flow properties of three dissimilar materials with similar particle sizes, using permeability and shear cell were analysed by Bumiller [15] and suggests that the particle shape might have significant effects on powder flow properties.…”

Section: Dynamic Flow Properties Measurement By Ft4 Powder Rheometermentioning

confidence: 99%

Flow property measurement of rice flour- A Review

Jan

Saxena

2016

MATEC Web of Conferences

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Abstract. This review covers conventional and new methods used to measure flowability of rice flour. Powder flowability is inherently complex due to many physical and environmental variables that determine how it responds to being moved. Investigating flowability requires a high specification powder rheometer having exceptional sensitivity and repeatability of measurement. This study shows how rice flour can be characterized regarding flowability in relation to flow rate, compaction and other factors.

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Quantifying Effects of Particulate Properties on Powder Flow Properties Using a Ring Shear Tester

Cited by 134 publications

References 21 publications

Vacuum assisted flow initiation in arching powders

Vacuum assisted flow initiation in arching powders

Development of a New Method to Get a Reliable Powder Flow Characteristics Using Only 1 to 2 g of Powder

Flow property measurement of rice flour- A Review

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