Effect of the particle size ratio on the structural properties of granular mixtures with discrete particle size distribution

Wiącek, Joanna; Stasiak, Mateusz

doi:10.1007/s10035-018-0800-7

Cited by 20 publications

(11 citation statements)

References 30 publications

(52 reference statements)

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“…Therefore, the addition of hay to the straw increased the uniformity of the blend and at the same time longer straw particles can increase the toughness of pellets for fracture. The effect of heterogeneity in particle size on the critical value of number of particle size fractions was investigated by Wiącek and Stasiak [51] for packings with different ratios between diameters of the largest and smallest grains. In mixtures with larger particle size ratios, small particles fit easily within the pores between large particles, thereby increasing the packing density.…”

Section: Particle Size Distributionmentioning

confidence: 99%

Particle Size Distribution and Physicochemical Properties of Pellets Made of Straw, Hay, and Their Blends

Lisowski

Matkowski

Dąbrowska

et al. 2018

Waste Biomass Valor

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The aims of the study were (a) the determination of the physicochemical characteristics of properties of pellets made of shredded residue from hay, wheat straw, and their blend at a ratio of 50:50, and (b) the determination of a mathematical model of pellet durability, using a response surface method. Tests were conducted according to applicable standards. As a result of thermal changes during the pressure agglomeration process, the material moisture content of pellets had slightly decreased versus raw three biomasses by 0.50% w.b. (wet basis) to a final value within the range of 5.56-5.87% w.b. The pellet properties of the blend were not adequately represented by the arithmetic mean of their components. Pellets made of hay, straw, and their blend, had DM (DM-dry matter) specific densities of 1034, 974, and 1102 kg m −3 , respectively. The densities showed correlation with calorific values (r = 0.637), which were in the range of 16.07-17.00 MJ kg −1 . The pellet durability coefficient correlated negatively with particle size and biomass moisture content. On the basis of previous conclusions, a non-linear mathematical model was formulated to account for the pellet durability coefficient relative to pellet moisture, and the relation of particle sizes and specific density to pellet bulk density.

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Section: Particle Size Distributionmentioning

confidence: 99%

Particle Size Distribution and Physicochemical Properties of Pellets Made of Straw, Hay, and Their Blends

Lisowski

Matkowski

Dąbrowska

et al. 2018

Waste Biomass Valor

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“…Furthermore, the size distribution of solid particles influences the structure of the filter cake occurring: Consortia with large particle size distributions tend to increase the packing density of the building‐up filter cake structure and thereby its additional resistance to filtration. Voids between larger particles within the cake are filled by smaller particles resulting in a high cake density [44, 45]. The cell size distribution in the Chlorella B culture was wider compared to the Chlorella A culture due to the presence of bacteria, which are usually smaller than microalgae cells [1].…”

Section: Resultsmentioning

confidence: 99%

Characterization of an aerated submerged hollow fiber ultrafiltration device for efficient microalgae harvesting

Tena

Ranglová

Kubáč

et al. 2021

Engineering in Life Sciences

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The present work characterizes a submerged aerated hollow fiber polyvinylidene fluorid (PVDF) membrane (0.03 μm) device (Harvester) designed for the ultrafiltration (UF) of microalgae suspensions. Commercial baker's yeast served as model suspension to investigate the influence of the aeration rate of the hollow fibers on the critical flux (CF, Jc) for different cell concentrations. An optimal aeration rate of 1.25 vvm was determined. Moreover, the CF was evaluated using two different Chlorella cultures (axenic and non‐axenic) of various biomass densities (0.8–17.5 g DW/L). Comparably high CFs of 15.57 and 10.08 L/m/2/h were measured for microalgae concentrations of 4.8 and 10.0 g DW/L, respectively, applying very strict CF criteria. Furthermore, the Jc‐values correlated (negative) linearly with the biomass concentration (0.8–10.0 g DW/L). Concentration factors between 2.8 and 12.4 and volumetric reduction factors varying from 3.5 to 11.5 could be achieved in short‐term filtration, whereat a stable filtration handling biomass concentrations up to 40.0 g DW/L was feasible. Measures for fouling control (aeration of membrane fibers, periodic backflushing) have thus been proven to be successful. Estimations on energy consumption revealed very low energy demand of 17.97 kJ/m3 treated microalgae feed suspension (4.99 × 10−3 kWh/m3) and 37.83 kJ/kg treated biomass (1.05 × 10−2 kWh/kg), respectively, for an up‐concentration from 2 to 40 g DW/L of a microalgae suspension.

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“…Studies by some scholars (Wiącek and Molenda, 2014) show that due to the influence of polydispersity of particles, when there are more smaller particles, some small particles will fill the pores between larger particles, resulting in smaller average coordination number, which is somewhat different from the analysis results in this paper. It has been declared in the literature (Wiącek and Stasiak, 2018) that the number of contacts is determined by the bulk density of the system. In the ternary mixed system, the medium-sized particles will reduce the difference between the contact particles, resulting in a denser contact network.…”

Section: Shear Strengthmentioning

confidence: 99%

“…However, due to the limitation of the subject direction or technology, the research on PSD of granular materials is relatively general, and there is a lack of specific and detailed observation and research on continuous graded particles, such as monodisperse system (Liu et al, 2016a), binary particle system (Wiącek, 2016), ternary particle system (Wiącek and Stasiak, 2018), etc. These discontinuous PSD granular materials, Most granular materials have a large range of PSD.…”

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confidence: 99%

The Effect of Particle Size Distribution And Shape On The Microscopic Behaviors of Loess Via DEM

Sun

Ren

et al. 2021

Preprint

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Loess has loose metastable structure, which is not difficult to be destroyed under load. As the core and soul of loess structure, it is part of the main research directions of loess engineering properties at present to study its microscopic behaviors and then realize the interpretation and prediction of macroscopic mechanical properties. In this study, based on the analysis of the basic physical properties of loess samples from seven different places, each sample was scanned by X-ray with continuous slice CT, and the three-dimensional microstructure of loess samples was established. According to the computer graphics method, each particle is equivalent to an ellipsoid, and the flattening rate and elongation rate of particles in each sample are quantitatively counted. Taking the particle size distribution (PSD) and shape parameters (flatness and elongation) of each sample as the control factors for generating discrete element method (DEM) samples, a series of triaxial compression simulation tests were carried out, and the microscopic behaviors of each sample were studied within the whole test framework. Comparing the results of seven different samples, it is shown that both PSD and particle shape have effects on stress-strain relationship, dry density and the normal contact force of loess samples. Most of the sand particles (> 0.075mm) are flat particles, while the clay particles (< 0.005mm) are mainly near spheres. When the volume fraction of sand particles is large, the dry density of the sample is the lowest. However, when the content of near spherical clay particles is large and the particle size distribution is good, and the average coordination value is large, which shows that it has strong normal contact force, and thus higher shear strength.

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Effect of the particle size ratio on the structural properties of granular mixtures with discrete particle size distribution

Cited by 20 publications

References 30 publications

Particle Size Distribution and Physicochemical Properties of Pellets Made of Straw, Hay, and Their Blends

Particle Size Distribution and Physicochemical Properties of Pellets Made of Straw, Hay, and Their Blends

Characterization of an aerated submerged hollow fiber ultrafiltration device for efficient microalgae harvesting

The Effect of Particle Size Distribution And Shape On The Microscopic Behaviors of Loess Via DEM

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