Shape and drag of irregular angular particles and test dust

Connolly, Brian J.; Loth, Eric; Smith, C. F.

doi:10.1016/j.powtec.2019.12.045

Cited by 38 publications

(7 citation statements)

References 29 publications

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“…There exist recent studies that have determined the drag or settling velocity of irregular particles based on more complex descriptions of particle shapes [32][33][34]. However, our approach was to simplify the particle description and model so that it is more accessible for the engineering purposes of stormwater treatment.…”

Section: Introductionmentioning

confidence: 99%

Settling of Road-Deposited Sediment: Influence of Particle Density, Shape, Low Temperatures, and Deicing Salt

Rommel

Gelhardt

Welker

2020

Water

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Separation of particulate matter (PM) is the most important process to achieve a reduction of contaminants present in road runoff. To further improve knowledge about influencing factors on the settling of road-deposited sediment (RDS), samples from three sites were collected. Since particle size distribution (PSD) has the strongest effect on settling, the samples were sieved to achieve comparable PSDs so that the effects of particle density, shape, fluid temperature, and deicing salt concentration on settling could be assessed using settling experiments. Based on the experimental data, a previously proposed model that describes the settling of PM was further developed and validated. In addition, RDS samples were compared to a standard mineral material, which is currently in use to evaluate treatment efficiency of stormwater quality improvement devices. The main finding was that besides PSD, particle density is the most important influencing factor. Particle shape was thoroughly described but showed no significant improvement of the prediction of the settled mass. Temperature showed an effect on PM settling; deicing salts were negligible. The proposed models can sufficiently predict the settling of RDS in settling column experiments under varying boundary conditions and are easily applicable.

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Section: Introductionmentioning

confidence: 99%

Settling of Road-Deposited Sediment: Influence of Particle Density, Shape, Low Temperatures, and Deicing Salt

Rommel

Gelhardt

Welker

2020

Water

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“…Using two different liquids (see Section 2.1) provided a wide range of Re (9-2480) which covered Stokes', intermediate and early stages of Newton's flow regimes. 6,36 For the purpose of deaeration, each cylinder was filled with proper liquid 24 h prior to the experiments.…”

Section: Methodsmentioning

confidence: 99%

“…To evaluate the effect of the wall on the settling velocity as well as the C D of the reference model particles, two different sizes of vertical glass cylinders were selected. Using two different liquids (see Section 2.1) provided a wide range of Re (9–2480) which covered Stokes', intermediate and early stages of Newton's flow regimes 6,36 . For the purpose of deaeration, each cylinder was filled with proper liquid 24 h prior to the experiments.…”

Section: Methodsmentioning

confidence: 99%

On the drag coefficient of flat and non‐flat solid particles of irregular shapes: An experimental validation study

2022

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The very wide varieties of geometries of irregular particles makes it difficult to study their motion also propose a simple and general equation to estimate their drag coefficient (C D ). The goal of this research is to (1) experimentally validate the general C D correlation previously proposed by the authors of this article as a simple tool to estimate the C D of spherical to highly irregular particles over a wide ranges of Re from 0.001 to 300,000, and ( 2) examine and expand the reference model particles proposed by the authors to represent a wide range of irregular shapes (60 non-flat and 36 flat). A comparison between the C D experimentally measured using reference model particles over a range of Re from 9 to 2481 and the C D estimated using general C D correlation, also comparing with C D correlations by others, demonstrated the accuracy and simplicity of the proposed general C D correlation.

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“…independent of grain size and grain shape deviates significantly from spherical. Details can be found in references [18][19][20][21].…”

Section: Sample Characteristicsmentioning

confidence: 99%

Radon emanation from dust of varying composition and size

Meng¹,

Busenitz²,

Piepke³

et al. 2022

J. Inst.

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222Rn emanating from environmental dust constitutes an important background component for many low-energy, low-rate experiments. Radon emanation rates from dust and rock, thus, are important for experiment planning. In this paper, we report measured radon emanation fractions for five types of dry dust differing in grain size and composition. These data were obtained by a novel technique in γ-spectroscopy, measuring emanated and non-emanated 222Rn progeny activities as well as the parent 226Ra activity in a time series. The range of observed radon emanation fractions is (3.7 ± 2.0)% to (16.2 ± 0.9)%. Four of the five samples are standardized samples available commercially, so additional investigations of these samples may be readily carried out.

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Shape and drag of irregular angular particles and test dust

Cited by 38 publications

References 29 publications

Settling of Road-Deposited Sediment: Influence of Particle Density, Shape, Low Temperatures, and Deicing Salt

Settling of Road-Deposited Sediment: Influence of Particle Density, Shape, Low Temperatures, and Deicing Salt

On the drag coefficient of flat and non‐flat solid particles of irregular shapes: An experimental validation study

Radon emanation from dust of varying composition and size

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