Some properties of irregular 3-D particles

Date

2006-02-16

Author

Taylor, MA
Garboczi, EJ
Erdoğan, Sinan Turhan
Fowler, DW

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

95
views

0
downloads

This paper discusses some of the properties of irregular particles that are of interest to engineers, including volume, density and surface area. Numerical and statistical information on these properties is essential (a) for a better understanding of particulates, (b) to suggest more efficient ways to utilize particulate materials and (c) to permit the creation of mathematical models that can reduce the need for lengthy real-world testing. While the motivation, examples and applications are from the construction materials industry, the results should be of interest to others. Measurement techniques used included X-ray computed tomography (CT) and multiple projected images, augmented by traditional laboratory techniques. To compare the results of these techniques, a set of 12 rocks were studied of which six were between 19 mm and 12.7 mm (0.75 in. to 0.5 in.) in size, and six were between 12.7 mm and 6.3 mm (0.5 in. to 0.25 in.) in size. Microfine versions of these rocks (< 80 mu m equivalent spherical diameter) were also studied and compared. The shapes of the rocks were studied by relating three dimensions to their volume and surface area. These three physical dimensions were defined in two different ways: direct measurement of three unique orthogonal dimensions on the rock surface, and dimensions obtained from the use of absolute first moments of volume and principal second moments of volume. These measurements and calculated moments allowed the development of three-parameter equivalent shape models based on rectangular parallelepipeds and tri-axial ellipsoids. All types of three-parameter equivalent shape models considered provided acceptable accuracy in predicting both volume and surface area, with the box models being generally more physical and realistic than the ellipsoid-based equivalent shape models for the type of rocks considered.

Subject Keywords

X-ray computed tomography, Volume, Spherical harmonics, Random shape, Rocks, Moments

URI

https://hdl.handle.net/11511/49254

Journal

POWDER TECHNOLOGY

DOI

https://doi.org/10.1016/j.powtec.2005.10.013

Collections

Department of Civil Engineering, Article

Suggestions

OpenMETU
Core

Spherical harmonic-based random fields based on real particle 3D data: Improved numerical algorithm and quantitative comparison to real particles Liu, X.; Garboczi, E. J.; Grigoriu, M.; Lu, Y.; Erdoğan, Sinan Turhan (2011-02-15) The shape of particles often plays an important role in how they are used and in the properties of composite systems in which they are incorporated. When building models of systems that include real particles, it is often of interest to generate new, virtual particles whose 3D shape statistics are based on the 3D shape statistics of a collection of real particles. A previous paper showed mathematically how this can be carried out, but only had a small set of real particle shape data to use and only made a l...
A theoretical study of chemical doping and width effect on zigzag graphene nanoribbons Pekoz, Rengin; Erkoç, Şakir (Elsevier BV, 2009-12-01) The energetics and the electronic properties of nitrogen- and boron-doped graphene nanoribbons with zigzag edges have been investigated using density functional theory calculations. For the optimized geometry configurations, vibrational frequency analysis and wavefunction stability tests have been carried out. Different doping site optimizations for a model nanoribbon have been performed and formation energy values of these sites revealed that zigzag edgesite for both of the dopants were the most favorable ...
Detailed simulations of parabolic trough collector for investigating enhancement of heat transfer to absorber tube flow Uygur, Sinan; Tarı, İlker; Department of Mechanical Engineering (2021-2-12) In this thesis, a detailed method to simulate heat transfer and fluid flow of parabolic trough solar collectors is presented. An optical model of the considered collector is created with Tonatiuh ray tracing program. The data of ray tracing analysis is exported to MATLAB as a binary file for post-processing. Curve fitting and surface fitting to the data are performed to obtain the heat flux distribution on the absorber tube’s outer surface. User-defined functions (UDFs) for ANSYS Fluent Computational Fluid ...
Investigation of structural properties of boron carbide nanosystems under mechanical and thermal effects: molecular dynamics simulations Şimşek, Yusuf; Erkoç, Şakir; Sezgi, Naime Aslı; Department of Micro and Nanotechnology (2014) Structural properties of various boron-carbide nanosystems with different sizes have been investigated by performing classical molecular dynamics simulation techniques at several temperatures. Studied boron carbide systems are icosahedral nanoribbons and nanosheets, graphene like armchair and zigzag type of monolayer and bilayer boron carbide nanoribbons and nanosheets, armchair and zigzag type of boron carbide nanotubes, cubic form nanorods and nanosheets. Stillinger-Weber potential energy function paramet...
Investigation of structural, electronic, magnetic and lattice dynamical properties for XCoBi (X: Ti, Zr, Hf) Half-Heusler compounds Surucu, Gokhan; IŞIK, MEHMET; CANDAN, ABDULLAH; Wang, Xiaotian; Güllü, Hasan Hüseyin (Elsevier BV, 2020-06-15) Structural, electronic, magnetic, mechanical and lattice dynamical properties of XCoBi (X: Ti, Zr, Hf) Half-Heusler compounds have been investigated according to density functional theory and generalized gradient approximation. Among alpha, beta and gamma structural phases, gamma-phase structure has been found as the most stability characteristics depending on the calculated formation enthalpies, energy-volume dependencies and Cauchy pressures. Energy-volume plots of possible magnetic orders of gamma-phase ...

Citation Formats

M. Taylor, E. Garboczi, S. T. Erdoğan, and D. Fowler, “Some properties of irregular 3-D particles,” POWDER TECHNOLOGY, pp. 1–15, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/49254.