An investigation on the breakage behavior of olivine sand particles: An attainable region technique

In this study, we investigated the breakage behavior of a bed of olivine sand particles using a drop-weight impact test, with drop weights of various shapes (oval, cube, and sphere). An Attainable Region (AR) technique, which is a model-free and equipment-independent technique, was then applied to optimize the impact energy during the breakage process and also to get particles in defined particle size classes. The findings revealed that the different drop weights produce products within the three different particle size classes (feed, intermediate, and fine). A higher mass fraction of materials in the fine-sized class (−75 μm) was obtained when the spherical drop weight was used relative to the cubic and oval drop weights. The drop height was found to have a significant influence on the breakage process. The AR technique proved to be a practical approach for optimizing impact energy and particle size during the breakage of a bed of olivine particles, with potential application in sustainable soil stabilization projects.

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A fundamental investigation on the breakage of a bed of silica sand particles: An attainable region approach

Powder Technology ◽

10.1016/j.powtec.2016.07.075 ◽

2016 ◽

Vol 301 ◽

pp. 1208-1212 ◽

Cited By ~ 6

Author(s):

G. Danha ◽

D. Legodi ◽

N. Hlabangana ◽

C. Bhondayi ◽

D. Hildebrandt

Keyword(s):

Silica Sand ◽

Fundamental Investigation ◽

Attainable Region ◽

Sand Particles ◽

Region Approach

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Chemical Classification and Particle Sizing of Foundry Sands

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100118813 ◽

1985 ◽

Vol 43 ◽

pp. 388-389

Author(s):

D.S. DeMiglio

Keyword(s):

Image Analysis ◽

Energy Dispersive Spectrometer ◽

Image Analysis System ◽

Representative Sampling ◽

Foundry Sands ◽

Large Atomic Number ◽

Backscattered Electron ◽

Sand Particles ◽

Analysis System ◽

Reclamation System

Much progress has been made in recent years towards the development of closed-loop foundry sand reclamation systems. However, virtually all work to date has determined the effectiveness of these systems to remove surface clay and metal oxide scales by a qualitative inspection of a representative sampling of sand particles. In this investigation, particles from a series of foundry sands were sized and chemically classified by a Lemont image analysis system (which was interfaced with an SEM and an X-ray energy dispersive spectrometer) in order to statistically document the effectiveness of a reclamation system developed by The Pangborn Company - a subsidiary of SOHIO.The following samples were submitted: unreclaimed sand; calcined sand; calcined & mechanically scrubbed sand and unused sand. Prior to analysis, each sample was sprinkled onto a carbon mount and coated with an evaporated film of carbon. A backscattered electron photomicrograph of a field of scale-covered particles is shown in Figure 1. Due to a large atomic number difference between sand particles and the carbon mount, the backscattered electron signal was used for image analysis since it had a uniform contrast over the shape of each particle.

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Superhydrophobic Sands for the Preservation and Purification of Water

Coatings ◽

10.3390/coatings11020151 ◽

2021 ◽

Vol 11 (2) ◽

pp. 151

Author(s):

Yuyang Liu ◽

Chang-Hwan Choi

Keyword(s):

Water Surface ◽

Particulate Material ◽

Self Assembled Monolayer ◽

Hydrophobic Coatings ◽

Hydrophobic Coating ◽

Evaporation Loss ◽

Zno Nanocrystals ◽

Sand Particles ◽

Purification Of Water ◽

Nanoscale Roughness

Sand, a cheap and naturally abundant particulate material, was modified with photocatalytic and hydrophobic coatings to reduce evaporation loss and facilitate the purification of water. The first-level photocatalytic coatings (TiO2 or ZnO nanocrystals) rendered nanoscale roughness on the surface of the sand. The additional second-level hydrophobic coating of a self-assembled monolayer of octyltrimethoxysilane (OTS) made the sand particles superhydrophobic because of the nanoscale roughness imposed by the nanocrystals. The superhydrophobic sand particles, floating on the free surface of water due to their superhydrophobicity, significantly reduced the evaporation loss of water by 60%–90% in comparison to an uncovered water surface. When the outer hydrophobic coatings are weathered or disengaged, the inner photocatalytic coatings become exposed to water. Then, the sand particles act as photocatalysts to degrade the contaminants in water under solar radiation.

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Application of sand particles modified with NH2-MIL-101(Fe) as an efficient visible-light photocatalyst for Cr(VI) reduction

Chemosphere ◽

10.1016/j.chemosphere.2020.129365 ◽

2021 ◽

Vol 268 ◽

pp. 129365

Author(s):

Sadra Sadeghian ◽

Hossein Pourfakhar ◽

Majid Baghdadi ◽

Behnoush Aminzadeh

Keyword(s):

Visible Light ◽

Visible Light Photocatalyst ◽

Sand Particles

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Experimental study on laminated glass responses of high-speed trains subject to windblown sand particles loading

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.124332 ◽

2021 ◽

Vol 300 ◽

pp. 124332

Author(s):

Gongxun Deng ◽

Wen Ma ◽

Yong Peng ◽

Shiming Wang ◽

Song Yao ◽

...

Keyword(s):

Experimental Study ◽

High Speed ◽

Laminated Glass ◽

Windblown Sand ◽

High Speed Trains ◽

Sand Particles

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COMPUTATIONAL FLUID DYNAMICS STUDY OF DUSTY AIR FLOW OVER NACA 63415 AIRFOIL FOR WIND TURBINE APPLICATIONS

Jurnal Teknologi ◽

10.11113/jt.v79.11877 ◽

2017 ◽

Vol 79 (7-3) ◽

Cited By ~ 1

Author(s):

Iham F. Zidane ◽

Khalid M. Saqr ◽

Greg Swadener ◽

Xianghong Ma ◽

Mohamed F. Shehadeh

Keyword(s):

Numerical Simulation ◽

Wind Turbine ◽

South African ◽

Stokes Equations ◽

Lift Coefficient ◽

Turbine Blades ◽

Aerodynamic Performance ◽

Accurate Estimation ◽

African Countries ◽

Sand Particles

Gulf and South African countries have enormous potential for wind energy. However, the emergence of sand storms in this region postulates performance and reliability challenges on wind turbines. This study investigates the effects of debris flow on wind turbine blade performance. In this paper, two-dimensional incompressible Navier-Stokes equations and the transition SST turbulence model are used to analyze the aerodynamic performance of NACA 63415 airfoil under clean and sandy conditions. The numerical simulation of the airfoil under clean surface condition is performed at Reynolds number 460×103, and the numerical results have a good consistency with the experimental data. The Discrete Phase Model has been used to investigate the role sand particles play in the aerodynamic performance degradation. The pressure and lift coefficients of the airfoil have been computed under different sand particles flow rates. The performance of the airfoil under different angle of attacks has been studied. Results showed that the blade lift coefficient can deteriorate by 28% in conditions relevant to the Gulf and South African countries sand storms. As a result, the numerical simulation method has been verified to be economically available for accurate estimation of the sand particles effect on the wind turbine blades.

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