Effects of wall material hardness on choice of wall materials for design of hoppers and silos for the discharge of hard bulk solids

Bradley, M.S.A.; Pittman, A N; Bingley, M.S.; Farnish, Richard; Pickering, John

doi:10.1016/s0301-679x(00)00130-4

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…Some early data (Savage 1967) concerning flow of cohesionless bulk solids in a vertical converging channel showed that the particle-wall friction was more influential for the rate of flow than the angle of internal friction. Surface friction influences both wall and bulk solids properties as well as and handling conditions (Prescott et al, 1999;Bradley et al, 2000). Humidity of the surrounding air or moisture content of bulk solid significantly influences the surface properties of solid particles and as a result also the surface friction but the way the moisture interacts with particle material is complex.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Rheology of moist food powders as affected by moisture content

2016

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Dynamic testing to determine rheological characteristics of moist food powders (semolina, coarse wheat flour, potato starch) was carried out using a powder rheometer of a new construction. The unique feature of the rheometer is that scale of shearing was confined to the thickness of shearing band of powder bed only. It was found that flow pattern of moistened samples was noticeably and diversely affected by both moisture content (varying in the range of 0-15% w/w) and shear rate. The observed changes showed statistical significance p<0.01 in all trials carried out. What is noteworthy about the conducted research is that at some shear rate values, the shear stress of the bed reached the maximum for specific moisture content levels, irrespective of particle size of the bed.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Rheology of moist food powders as affected by moisture content

2016

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“…Prescott, Ploof, and Carson (1999) present a comprehensive overview of how these various factors affect wall friction. Factors affecting the wall surface include the surface material, surface roughness, surface wear (Bradley, Pittman, Bingley, Farnish, & Pickering, 2000) and surface corrosion. Type 304 stainless steel with a 2-B surface finish is commonly used in hopper and silo design.…”

Section: Introductionmentioning

confidence: 99%

Effect of storage conditions on the wall friction characteristics of three food powders

Iqbal

Fitzpatrick

2006

Journal of Food Engineering

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“…A classical treatment of friction shows no affect of hardness on either the adhesive or deformation friction forces. However, Bradley et al [8] pointed out that hardness could have an indirect affect by controlling the penetration depth of a particle for a given load. For 'blunt' particles, this may consequently affect the 'attack angle' of the particle and hence the friction.…”

Section: Discussionmentioning

confidence: 99%

“…More complex models [8] again show no direct effect of hardness but do admit the possibility that it might influence friction through an indirect influence on interfacial shear strength. Moreover, Bradley et al [9], while taking a simplistic classical approach, pointed out that hardness could also have an indirect effect by controlling the penetration depth of a particle for a given load. For 'blunt' particles, this may consequently affect the 'attack angle' of the particle and hence the friction.…”

Section: Discussionmentioning

confidence: 99%

Frictional characteristics of steel plates during abrasive particle flow: A comparison of in situ measurements made on a linear abrasive wear tester with those on a Jenike shear tester

Mengistu

Bingley

Bradley

2004

Proceedings of the Institution of Mechanical Engineers, Part E:

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Friction measurements were made on two testers: the Jenike shear tester and a linear abrasive wear tester (LAWT). Wall friction values were obtained for a range of steels and surface finishes, typical of the plates used for the manufacture of hoppers and silos in bulk solids handling applications. The abrasive used was crushed soda-lime glass. It was found that friction values on the Jenike were similar to the initial 'start up' values obtained on the LAWT. The latter correlated particularly well with the surface roughness of the sample plates. On the LAWT, friction was found to increase with sliding distance until a steady-state level was attained. It is considered that this increase is due to the gradual accumulation of wear debris, particularly fragmented abrasive particles, on the surface of the wear specimen.

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Effects of wall material hardness on choice of wall materials for design of hoppers and silos for the discharge of hard bulk solids

Cited by 10 publications

References 8 publications

Rheology of moist food powders as affected by moisture content

Rheology of moist food powders as affected by moisture content

Effect of storage conditions on the wall friction characteristics of three food powders

Frictional characteristics of steel plates during abrasive particle flow: A comparison of in situ measurements made on a linear abrasive wear tester with those on a Jenike shear tester

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