The coefficient of restitution of different representative types of granules

Mangwandi, Chirangano; Cheong, Y.S.; Adams, M.J.; Hounslow, Michael J.; Salman, Agba D.

doi:10.1016/j.ces.2006.08.063

Cited by 79 publications

(37 citation statements)

References 31 publications

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“…If the contact force exceeds the yield point, the coefficient of restitution can decrease with increasing impact velocity, which was shown in many experimental studies [21,23,46,64,86] and described with the models [73,94].…”

Section: Significant Factors Affecting the Restitution Coefficientmentioning

confidence: 99%

“…Recently, the granules have been investigated using compression test: Al 2 O 3 produced by fluidized bed-spray granulation [4], detergents [78], enzyme [10], polymer bound Al 2 O 3 granules [84] and calcium carbonate [64]. Figure 12 shows the principle of a granulate compression test.…”

Section: Compression Testsmentioning

confidence: 99%

“…However, many different models were developed to describe the restitution coefficient of viscoelastic (Schafer et al [79], Stronge [88], Stoianovici and Harmuzlu [87]), viscoelastic-adhesive (Thornton and Ning), viscoelastic (Brilliantov [11]), elastic-perfectly plastic (Thornton [93], Wu et al [109]), elastic-perfectly plastic adhesive (Thornton and Ning [94]), elastic-perfectly plastic with hardening (Mangwandi et al [64]), elastic-plastic (Johnson [38]), elastic-viscoplastic (Adams et al [3]), plastic and viscoplastic (Walton and Braun [106]), elastic-adhesive (Thornton and Ning [94]) contacts. A review of these models is given in Table 1.…”

Section: Significant Factors Affecting the Restitution Coefficientmentioning

confidence: 99%

“…Based on the assumption of a continuous matter, contact theory and continuum mechanics can be used to describe the mechanical behaviour of a granule without breakage through experimentally observed mechanical parameters like modulus of elasticity, yield point, contact stiffness. In our previous publications [5,6] as well as in numerous experimental studies of other authors [10,21,64,71,78,84], it was shown that the granules, similar to the solids, have different contact behaviour from dominantly elastic to dominantly plastic which is often time and deformation rate dependent and is related to adhesion effects.…”

Section: Introductionmentioning

confidence: 99%

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Energy absorption during compression and impact of dry elastic-plastic spherical granules

et al. 2010

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The discrete modelling and understanding of the particle dynamics in fluidized bed apparatuses, mixers, mills and others are based on the knowledge about the physical properties of particles and their mechanical behaviour during slow, fast and repeated stressing. In this paper model parameters (modulus of elasticity, stiffness, yield pressure, restitution coefficient and strength) of spherical granules ( γ -Al 2 O 3 , zeolites 4A and 13X, sodium benzoate) with different mechanical behaviour have been measured by single particle compression and impact tests. Starting with the elastic compression behaviour of granules as described by Hertz theory, a new contact model was developed to describe the force-displacement behaviour of elastic-plastic granules. The aim of this work is to understand the energy absorption during compression (slow stressing velocity of 0.02 mm/s) and impact (the impact velocity of 0.5-4.5 m/s) of granules. For all examined granules the estimated energy absorption during the impact is found to be far lower than that during compression. Moreover, the measured restitution coefficient is independent of the impact velocity in the examined range and independent of the load intensity by compression (i.e. maximum compressive load). In the case of repeated loading with a constant load amplitude, the granules show cyclic hardening with increasing restitution coefficient up to a certain saturation in the plastic deformation. A model was proposed to describe the increase of the contact stiffness with the number of cycles. When the load amplitude is subsequently increased, further plastic deformation takes place and the restitution coefficient strongly decreases.

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Section: Significant Factors Affecting the Restitution Coefficientmentioning

confidence: 99%

Section: Compression Testsmentioning

confidence: 99%

Section: Significant Factors Affecting the Restitution Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy absorption during compression and impact of dry elastic-plastic spherical granules

et al. 2010

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“…The granule strength was determined from diametric compression of the single granules using method described previously [12][13][14]. The granule strength was determined from the failure load, f F , and granule diameter, D , which is taken as the…”

Section: Determination Of Granule Strengthmentioning

confidence: 99%

Alternative method for producing organic fertiliser from anaerobic digestion liquor and limestone powder: High Shear wet granulation

et al. 2013

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Publisher rights This is the author's version of a work that was accepted for publication in Powder Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Powder Technology, VOL 233, 01/2013 General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. energy production are considered as waste. This has a negative impact on the sustainability of AD processes because of the financial outlay required to treat digestate before being discharged into municipal water treatment plants or natural water bodies. The main aim of research was to investigate feasibility of producing an organic fertiliser using anaerobic digestate and limestone powders as the raw materials employing a high shear granulation process. Two-level factorial experimental design was used to determine the influence of granulation process variables on, the strength, resistance to attrition and yield of the granules. It was concluded from the study that it is technically feasible to produce organic fertiliser granules of acceptable strength and product yield. Increasing the liquid-to-solid ratio during granulation leads to increased granule strength and better product yield. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTAlthough the strength of the granules produced was lower than typical strength of commercial synthetic fertiliser granules (about 5 to 7 MPa), this could be improved by mixing the digestate with a polymeric binder or coating the particles post granulation.

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Determination of Physical Properties of Fine Particles, Nanoparticles and Particle Beds

Hintz

Antonyuk

Schubert³

et al. 2008

Modern Drying Technology

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The coefficient of restitution of different representative types of granules

Cited by 79 publications

References 31 publications

Energy absorption during compression and impact of dry elastic-plastic spherical granules

Energy absorption during compression and impact of dry elastic-plastic spherical granules

Alternative method for producing organic fertiliser from anaerobic digestion liquor and limestone powder: High Shear wet granulation

Determination of Physical Properties of Fine Particles, Nanoparticles and Particle Beds

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