Method for calculating packing density of powder particles in paste with continuous particle size distribution

2008 ◽  
Vol 187 (1) ◽  
pp. 88-93 ◽  
Author(s):  
Guo Ye ◽  
Huang Xin ◽  
Zhu Bao-lin ◽  
Ma Bao-guo ◽  
Zhu Hong-bo
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Packing Density ◽  
Powder Particles ◽  
Continuous Particle

A Calculation Method for Packing Density of Powder in Paste with Continuous Grain Size Distribution

2011 ◽  
Vol 477 ◽  
pp. 125-131 ◽  
Author(s):  
Ye Guo ◽  
Xin Huang ◽  
Bao Lin Zhu
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Packing Density ◽  
Calculation Method ◽  
Particle System ◽  
Water Film ◽  
Cementitious Materials ◽  
Fly Ashes ◽  
Powder Particles ◽  
Continuous Particle

By regarding the powder particles warpped with water film as compounded particles, the packing density of powder particles in actual paste system is transformed into the packing density of compounded partcles in imaginary dry-particle system. Based on Stovall Model, a calculation method for packing density of powder with continuous particle size distribution in paste is developed, and the parameters in the method are dentified by experiment. This calculation method could be used to simulate the packing density of cementitious materials such as cement, fine slag, and fly ashes.

Prediction of Packing Density of Milled Powder Based on Packing Simulation and Particle Shape Analysis

2007 ◽  
Vol 534-536 ◽  
pp. 1621-1624
Author(s):  
Yuto Amano ◽  
Takashi Itoh ◽  
Hoshiaki Terao ◽  
Naoyuki Kanetake
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Shape Analysis ◽  
Packing Density ◽  
Particle Shape ◽  
Milled Powder ◽  
Spherical Particles ◽  
Nonspherical Particles ◽  
Property Control

For precise property control of sintered products, it is important to know the powder characteristics, especially the packing density of the powder. In a previous work, we developed a packing simulation program that could make a packed bed of spherical particles having particle size distribution. In order to predict the packing density of the actual powder that consisted of nonspherical particles, we combined the packing simulation with a particle shape analysis. We investigated the influence of the particle size distribution of the powder on the packing density by executing the packing simulation based on particle size distributions of the actual milled chromium powders. In addition, the influence of the particle shape of the actual powder on the packing density was quantitatively analyzed. A prediction of the packing density of the milled powder was attempted with an analytical expression between the particle shape of the powder and the packing simulation. The predicted packing densities were in good agreement with the actual data.

A GENERALIZED KINETIC MODEL OF SEDIMENTATION OF POLYDISPERSE SUSPENSIONS WITH A CONTINUOUS PARTICLE SIZE DISTRIBUTION

2008 ◽  
Vol 18 (10) ◽  
pp. 1741-1785 ◽  
Author(s):  
RAIMUND BÜRGER ◽  
ANTONIO GARCIA ◽  
MATTHIAS KUNIK
Keyword(s):  
Particle Size ◽  
Kinetic Theory ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Density Function ◽  
Volume Fraction ◽  
Kinematic Model ◽  
Phase Density ◽  
Continuous Particle ◽  
Generalized Kinetic Model

Polydisperse suspensions with particles of a finite number N of size classes have been widely studied in laboratory experiments. However, in most real-world applications the particle sizes are distributed continuously. In this paper, a well-studied one-dimensional kinematic model for batch sedimentation of polydisperse suspensions of small equal-density spheres is extended to suspensions with a continuous particle size distribution. For this purpose, the phase density function Φ = Φ(t, x, ξ), where ξ ∈ [0, 1] is the normalized squared size of the particles, is introduced, whose integral with respect to ξ on an interval [ξ1, ξ2] is equivalent to the volume fraction at (t, x) occupied by particles of that size range. Combining the Masliyah–Lockett–Bassoon (MLB) model for the solid-fluid relative velocity for each solids species with the concept of phase density function yields a scalar, first-order equation for Φ, namely the equation of the generalized kinetic theory. Three numerical schemes for the solution of this equation are introduced, and a numerical example and an L1 error study show that one of these schemes introduces less numerical diffusion and less spurious oscillations near discontinuities than the others. Several numerical examples illustrate the simulated behavior of this kind of suspensions. Numerical results also illustrate the solution of an eigenvalue problem associated with the equation of the generalized kinetic theory.

Online Continuous Particle Size Distribution Analysis for Grinding Process in a Jet Mill

2017 ◽  
Vol 54 (7) ◽  
pp. 483-486
Author(s):  
Fumiaki Sato ◽  
Hideyuki Ikeda ◽  
Michio Osumi ◽  
Yasuyuki Fujita ◽  
Isamu Minami ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Grinding Process ◽  
Distribution Analysis ◽  
Continuous Particle

Influence of Cement Particle Size Distribution on Strength of Hardened Cement Paste

2011 ◽  
Vol 477 ◽  
pp. 118-124
Author(s):  
Bao Lin Zhu ◽  
Xin Huang ◽  
Ye Guo
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Cement Paste ◽  
Solid Phase ◽  
Hardened Cement ◽  
Cement Particle ◽  
Hardened Cement Paste ◽  
Effect Of Particle Size ◽  
Continuous Particle

On the basis of the principle for the highest filling degree of cement hydrates, it is synthetically considered that a matching connection between hydration of cement, volume increment of solid phase and packing density of cement paste, a calculation method for a connection between cement continuous particle size distribution and strength of hardened cement paste is developed and tested by experiment. Based on above-mentioned analysis, a tentative research on the effect of particle size distribution of cement on strength is carried out.

scholarly journals Predicting the soil moisture retention curve, from soil particle size distribution and bulk density data using a packing density scaling factor

2014 ◽  
Vol 18 (10) ◽  
pp. 4053-4063 ◽  
Author(s):  
F. Meskini-Vishkaee ◽  
M. H. Mohammadi ◽  
M. Vanclooster
Keyword(s):  
Particle Size ◽  
Soil Moisture ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Packing Density ◽  
Characteristic Curve ◽  
Scaling Factor ◽  
Particle Packing ◽  
Soil Particle ◽  
Physically Based

Abstract. A substantial number of models predicting the soil moisture characteristic curve (SMC) from particle size distribution (PSD) data underestimate the dry range of the SMC especially in soils with high clay and organic matter contents. In this study, we applied a continuous form of the PSD model to predict the SMC, and subsequently we developed a physically based scaling approach to reduce the model's bias at the dry range of the SMC. The soil particle packing density was considered as a metric of soil structure and used to define a soil particle packing scaling factor. This factor was subsequently integrated in the conceptual SMC prediction model. The model was tested on 82 soils, selected from the UNSODA database. The results show that the scaling approach properly estimates the SMC for all soil samples. In comparison to the original conceptual SMC model without scaling, the scaling approach improves the model estimations on average by 30%. Improvements were particularly significant for the fine- and medium-textured soils. Since the scaling approach is parsimonious and does not rely on additional empirical parameters, we conclude that this approach may be used for estimating SMC at the larger field scale from basic soil data.

scholarly journals Particle Packing Application for Improvement in the Properties of Compressed Stabilized Earth Blocks with Reduced Clay and Silt

2019 ◽  
Vol 9 (4) ◽  
pp. 4538-4542
Author(s):  
S. N. Malkanthi ◽  
A. A. D. A. J. Perera
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Particle Packing ◽  
Correct Selection ◽  
Soil Mixture ◽  
Silt Content ◽  
Earth Blocks ◽  
Continuous Particle

Soil as a building material has been used in different forms such as mud, adobe, rammed earth and bricks. The present study focuses on producing Compressed Stabilized Earth Blocks (CSEBs) giving attention to the particle size distribution in the soil mixture. The literature established that compressive strength significantly depends on clay and silt content and 25% of clay and silt produce optimum results while no attention has been given to the amount of other, larger particles. Soil grading refers to the combination of different-size particles in a soil mixture. The correct selection of sizes in the correct proportion may cause improvements in CSEB properties. This paper explains the application of particle packing technology for the improvement of CSEB properties. The theoretical concepts provide a continuous particle size distribution, and the soil used for the experiments also has a continuous particle size distribution. The soil used in the experiments was subjected to washing to reduce the clay and silt content. Separated clay and silt and large particles of different sizes were added to the mixture to match particle size distribution to the optimization curves as explained in particle packing theories. The experimental results show that the CSEB properties can be significantly improved by modifying particle size distribution to fit the suggested optimization curves. According to the results, the compressive strength improved by more than 50% with different amounts of cement stabilization. Significant improvements in the dry densities and water absorption ratios of blocks were observed with this particle size modification.

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