Some investigations into the strength and flow properties of powders

Ashton, Mark; Cheng, D. C.-H.; Farley, R.; Valentin, Finn

doi:10.1007/bf01969257

Cited by 151 publications

(24 citation statements)

References 4 publications

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“…Such theories are based on the assumption that consolidation and non-rapid flow of particulate solids can be related with adhesion forces in particles contacts, and they include the failure hypotheses of Tresca and Coulomb-Mohr and the yield locus concept of Jenike (Jenike et al, 1960;Jenike, 1962) as well as the Warren-Spring Equations (Ashton et al, 1965;Cheng, 1968;Stainforth et al, 1971;Stainforth and Ashley, 1973;Stainforth and Berry, 1973).…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Experimental and theoretical analysis of TiO2 powders flow properties at ambient and high temperatures

Macrì

Lettieri

Poletto

2017

Chemical Engineering Science

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Highlights Temperature effect on bulk flow properties of TiO 2 powders is evaluated experimentally.  Measured properties are related to the microscopic IPFs by theoretical models.  A sensitivity analysis on models' parameters is performed. AbstractChanges of bulk flow properties of two different types of titanium dioxide powders are measured at room temperature and 500 °C using the High Temperature Annular Shear Cell.A significant increase of the macroscopic bulk flow properties is observed with increasing temperature, in particular with regards to the unconfined yield strength. Two different modelling approaches are proposed with the aim to relate the measured properties to the microscopic interactions between particles. The results indicate that both the model provides a good match with the experimental data when proper values for the models' parameters are taken into account. To this end, the sensitivity analysis for the main parameters of the models is performed.

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Section: Theoretical Frameworkmentioning

confidence: 99%

Experimental and theoretical analysis of TiO2 powders flow properties at ambient and high temperatures

Macrì

Lettieri

Poletto

2017

Chemical Engineering Science

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“…Capillary forces, generated in granular materials by adding small amounts of liquid, play a crucial role in agglomeration, flow behaviour, moisture retention and strength properties (Schubert et al 1984). Among other physical properties, tensile strength is considered to be an important parameter in powder characterization (Pierrat and Caram 1997) and has important industrial applications (Ashton et al 1965;Cheng 1968). Theories proposed by Rumpf (1961) and Schubert (1975aSchubert ( , 1984 to predict tensile strength of powders have found its application in the field of unsaturated granular soils.…”

Section: Contact Angle Degreesmentioning

confidence: 99%

Effect of Pore-Water Surface Tension on Tensile Strength of Unsaturated Sand

2016

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Tensile behaviour of unsaturated sand was investigated both experimentally and theoretically.A custom-built direct tension apparatus was employed to perform direct tension tests on unsaturated silica sand specimens at different saturations levels and packing dry densities.Attempt was made to understand the effect of surface tension of pore-liquid and tensile loading rate on the tensile strength. It was found that the tensile strength decreases, as the surface tension of the pore-liquid decreases and rate of loading increases. However, tensile strength does not decrease as a simple multiple of ratio of surface tension of pore-liquid. The experimental results were also compared with the predicted results from two theoretical tensile strength models, namely, micro-mechanical and the macro-mechanical models. Results predicted using the micro-mechanical model agreed well with the experimental results, but only for specimens containing distilled water in the pendular saturation regime. On the other hand, the macro-mechanical model followed the experimental trend across pendular and funicular saturation regimes for specimens containing distilled water reasonably well.However, at reduced surface tension of pore-liquid, both models significantly under-predicted the experimental tensile strength results.iii ACKNOWLEDGEMENTS Foremost, I would like to express the deepest appreciation to my thesis supervisor and mentor, Dr. Jitendrapal Sharma, who has the attitude and the substance of a genius. Without his guidance and relentless encouragement, my thesis would not have been possible. I would also like to thank him for his financial support throughout the course of the researchwork.Thanks for everything, Dr. Sharma.In addition, a big thank you to my co-supervisor Dr. Rashid Bashir, whose expertise in unsaturated soil mechanics helped me to structure my research and thesis. He has shared valuable insights in the relevance of the study and made this research successful. I would also

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“…The Jenike shear test method is an extremely useful quantitative method for designing storage bins for gravity flow of solids. Ashton et al (1965) investigated the strength and flow properties of more than 30 powders using the consolidating procedure recommended by Jenike. The Jenike shear cell was used to study the flow properties of cement (Schrämli, 1967), fine lactose powder with and without conditioners (York, 1975), wheat flour and sugar (Kamath et al, 1993), wheat flour at three moisture contents (Kamath et al, 1994), confectionary sugar and detergent (Duffy and Puri, 1994), grains (Duffy and Puri, 1999), and milk powders with different fat contents (Fitzpatrick et al, 2004b).…”

Section: ) Static Angle Of Internal Friction (φT)mentioning

confidence: 99%