Moreno-Atanasio, R. and Ghadiri, M. (2006) Mechanistic analysis and computer simulation of impact breakage of agglomerates: Effect of surface energy. Chemical Engineering Science, 61 (8). pp. 2476-2481..
In a vertical shaft impact crusher, the particle crushing process is extraordinarily complex, and the particle shape significantly influences the size distribution of the crushed product. To quantify the crushing behavior of particles more accurately and thus reveal the crushing mechanism of the crusher, an analytical approach is suggested for characterizing the …
Also materials such as sodium chloride crystals [29], sand [30], and detergents [16] have been tested in this way. Tomas et al. [31] and Khanal et al. [32] have used the approach for impact testing of large concrete balls. Ghadiri and co-workers have developed an impact tester to study the breakage of particles [15], [29].
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A mechanistic model of impact attrition due to chipping of particulate solids, having a semi- brittle failure mode, has been developed in Part 1 (Ghadiri & Zhang, 2002), based on …
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A theoretical model for chipping of semi-brittle particulate solids was proposed by Ghadiri and Zhang [24] and an approach to predict milling behaviour was developed on the …
Moreno-Atanasio and Ghadiri (2006) proposed a simple mechanistic model that relates the number of broken contacts in an agglomerate due to impact velocity, interparticle …
In combination with Δ, a dimensionless number relating incident kinetic energy to agglomerate strength (Moreno‐Atanasio and Ghadiri M, Chem Eng Sci. 2006;61(8):2476–2481), a good description of the agglomerate impact is obtained.
Impact crushing is the most important ore crushing me thod. There are three cl assical theories to predict the fragmentation of ore under impacting load, namely, surface ar ea …
It has been shown that the splashing of water droplets and target material uses less than 5 per cent of the impact energy (Ghadiri and Payne, 1979). Other impact factors whose roles in crater formation were investigated are impact stress, …
nano-indentation tester (Micro Materials Ltd.) (Ghadiri, 2006) for estimating contact area at impact. Table 1 shows Young's modulus of elasticity E and yield stress Y of the samples, which is obtained as one third of the indentation hardness measured by the indentation tests (Ghadiri, 2006). 2.5 Contact potential difference of the sample powders
Observations of the impact damage by high-speed photography showed that attrition was caused by chipping of comers and/or edges adjacent to the impact site at low impact velocities, and by …
Impact breakage of poly-methylmethacrylate(PMMA) extrudates: I. Chipping mechanism DIMITRIS G. PAPADOPOULOS and MOJTABA GHADIRI* Departmentof Chemical and Process Engineering, University of Surrey, Guildford, Surrey GU25XH,UK Received for APT 10 January1996;accepted 12 March 1996 Abstract-Poly-methylmethacrylate(PMMA) …
In this paper, the prototypical process of the normal impact of dense agglomerates is investigated using the discrete element method-boundary element method coupled …
As a consequence, DEM simulations have been widely used to investigate the breakage of agglomerates, particularly in identifying broken interparticle contacts induced by impact (Kafui and Thornton ...
Ore crushing is one of the most important steps in mine engineering, and numerical simulation is a useful way to predict the crushing effect under impact load. Based on continuum …
Discrete Element Method (DEM) is then employed to simulate the agglomerate crushing process. ... the effects of several influential factors including impact conditions, structure, shape and surface energy have been analysed (Liu et al., 2010, Mishra and Thornton, 2001, Thornton et al., 2004, Thornton and Liu, 2004, Thornton et al., 1996 ...
We have developed models of impact breakage accounting for material mechanical properties and have also analysed particle breakage under bulk shear straining of particles.
Results of a study on the influence of operation scale and impeller speed of high shear mixer granulators on the strength of granlues are reported in this paper.
broken granules by impact testing using placebo granules. Impact testing is preferred in comparison with the quasi-static side crushing test for two reasons: (i) the granule strength has such a narrow distribution that a very large number of granules has to be tested to identify the number of outliers, for which impact testing is much
The above conclusions can provide basis for optimal design of impact crushing process of iron ore. Export citation and abstract BibTeX RIS. Previous article in ... Mu Fusheng 2006 Current status and development requirements for the research of ... Ning Z and Ghadiri M 2006 Distinct element analysis of attrition of granular solids under ...
In previous literature, the breakage behavior of agglomerates resulting from impact has been comprehensively investigated with the focus on the effect of impact velocity, impact angle, and surface energy (Kafui and Thornton, 2000, Mishra and Thornton, 2001, Moreno-Atanasio and Ghadiri, 2006, Samimi et al., 2004, Thornton et al., 1996, Thornton ...
The side crushing strength (SCS) of single particles is used as the criterion for fragmentation. ... from the surface of colliding IOPs based on the work of Ning and Ghadiri (2006). Ning and ...
15 (Ghadiri, 2006). Breakage of materials failing in the brittle mode is commonly analysed using 16 Weibull probability distribution (Weibull, 1951), where the breakage probability is related to ... The mechanistic model of particle impact breakage of Ghadiri and . 5 1 Zhang (2002) is used in this work to analyse the breakage.
Impact [13-18], wear [19], side crushing [20-23] and indentation [24] are some of the test methods used for single particles. According to Ghadiri et al. [12], these methods have
Semantic Scholar extracted view of "Observations on impact attrition of granular solids" by K. Yuregir et al.
nano-indentation tester (Micro Materials Ltd.) (Ghadiri, 2006) for estimating contact area at impact. Table 1 shows Young's modulus of elasticity E and yield stress Y of the samples, which is obtained as one third of the indentation hardness measured by the indentation tests (Ghadiri, 2006). 2.5 Contact potential difference of the sample powders