Laboratory measurements of velocity and turbulence field behind porous fences

Lee, Sang-Joon; Kim, Hyoung-Bum

doi:10.1016/s0167-6105(98)00193-7

Cited by 128 publications

(92 citation statements)

References 9 publications

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“…The authors, based on their own experience and other research like [5] and [6], changed a solid barrier for a 30% porosity barrier, proving that the dust emission is reduced by 78%.…”

Section: Introductionmentioning

confidence: 97%

CFD simulation with multiphase flows in porous media and open mineral storage pile

Torno¹,

Toraño²,

Diego³

et al. 2009

Computational Methods in Multiphase Flow V

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In open storage piles in bulk solids port terminals, power stations and cement factories, not only the solid and porous barrier behaviour in front of the pile is important, but also the effect that porous and solid barriers produce when they are behind the pile.Considering the dust propagation behind the pile, the solid barriers are more effective than the porous ones. But, the effect of the porous barriers on the wind velocity distribution, mainly in zones between the barriers and the piles should be taken into account, regarding the total dust emission to the atmosphere and its propagation.In these studies, wind and dust concentration measurements in laboratory and field were carried out. A hot-wire anemometer (Velocicalc Plus (TSI)) was used in the wind study and two dust collectors (E-Sampler, Met One Instruments, Inc., Oregon, USA) were used to measure the dust concentration (Total Particle like PM10); a meteorological station (E-Sampler, Met One Instruments, Inc., Oregon, USA) attached to a PM10 collector was also employed.All these measurements were used to adjust the 3D CFD computational model (Ansys CFX 10.0): In the wind case through a k-epsilon turbulence model and the dust case by Lagrangian method.These adjusted models allow us to carry out several simulations combining the effect of solid and porous fences in front of and behind the pile, as well as pile shape modifications and behaviour analysis according to the dust emission from several special configurations and its relation to the wind gust preferential directions.

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“…The authors, based on their own experience and other research like [5] and [6], changed a solid barrier for a 30% porosity barrier, proving that the dust emission is reduced by 78%.…”

Section: Introductionmentioning

confidence: 97%

CFD simulation with multiphase flows in porous media and open mineral storage pile

Torno¹,

Toraño²,

Diego³

et al. 2009

Computational Methods in Multiphase Flow V

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“…In recent years, with the continuous development of optical technology PIV technology has been introduced into the study of windblown sand movements, and some progress has been made. Its advantage is that the instantaneous, contactless measurement of whole field can be achieved [12,13]. In this study, sand emission rate and the rate of sand emission number are directly measured by wind tunnel experiments using PIV, which estimate the ability of the contribution of the source of dust storm to dust storm and dust emission in the process of soil erosion and also provides strong support for the numerical simulation of aeolian sand transport.…”

Section: Introductionmentioning

confidence: 99%

Wind tunnel studies on the vertical emission of sand grains from surface

Guo¹,

Huang²

2013

AIP Conference Proceedings

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Abstract.It is an important process that the sand grain escapes from the surface into aeolian sand transport, which is called sand emission. The rate of the sand grains escaping from the surface, which is named as sand emission rate, is defined as the quantity of the sand grains moving upward from the surface per unit time and unit area. Sand emission rate reflected the intensity of sand grains escaping from the surface into aeolian sand transport. Unfortunately, so far there is no effective method to directly measure it. In recent years, with the continuous development of optical technology, PIV technology has been introduced into the study of windblown sand movements. Its advantage is that the instantaneous, contactless measurement of whole field can be achieved. In this paper, the particle image velocimetry system (PIV) was used to measure the sand emission rate and the grain size distribution of lifting off sand grains. The results show that almost the same as the rate of sand grains falling down on the surface, the emission rate increases linearly with wind speed. As the wind speed increases, the proportion of the number of the lifting off sand grains whose grain size is less than 0.34mm to the number of the whole lifting off sand grains decreases linearly, while the proportion of the number of the lifting off sand grain whose grain size is more than 0.42mm to the number of the whole sand grains lifting off increases linearly. Moreover, the proportion of the number of the lifting off sand grains whose grain size is between 0.34-0.42 mm to the number of the whole sand grains lifting off is almost invariable with wind velocity.

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“…In recent years, computational fluid dynamics (CFD) techniques have been effectively used to determine fluid flows and calculate the mean velocity profiles of far wakes behind solid obstacles. The flow characteristics around a two-dimensional triangular-shaped prism located behind a porous wind fence have been investigated numerically by using the RNG (Renormalization Group) k-ε turbulence model (Kim et al, 1997;Lee and Lim, 2001;Lee and Kim, 1999). The relationship between the screen pressure coefficient and porosity was determined to calculate the entrapment of particles by windbreaks (Raupach et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Airflow Structure and Dust Emissions behind Porous Fences Used to Shelter Open Storage Piles

Song

Lin

Cao

et al. 2014

Aerosol Air Qual. Res.

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Porous fences can reduce dust emissions from storage piles in open storage yards, but their sheltering effect depends on the airflow structure around the pile, and the shear stress distribution on each surface. In this study, static flow fields were numerically simulated using the standard k-ε turbulence model; the shear stress characteristics and distribution on the windward side, flat-top surface, and leeward side of a typical prismatic material stack were analyzed. The distribution of the aerodynamic structure of each surface of the storage pile was determined according to the flow field data for fences of the porosities ε = 0, 0.2, 0.3, 0.4, 0.5, and 0.6. The results indicated that at low porosities (ε = 0, 0.2) a recirculating flow appeared in the region between the fence and the pile. The shear force acted downward the windward slope, and the maximum dust emission occurred at two-thirds the height of the windward side, rather than at the top, as in unfenced conditions. Using the porous fence simulated in this study, shear stress on the windward side and the flat-top surface first decreased, then increased with increasing porosity; the lowest porosity values were 0.2 and 0.3, and the shear stress on the prismatic leeside changed little with increasing porosity. The numerical predictions indicated that a fence with porosity between 0.2 and 0.3 is optimal.

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Laboratory measurements of velocity and turbulence field behind porous fences

Cited by 128 publications

References 9 publications

CFD simulation with multiphase flows in porous media and open mineral storage pile

CFD simulation with multiphase flows in porous media and open mineral storage pile

Wind tunnel studies on the vertical emission of sand grains from surface

Numerical Simulation of Airflow Structure and Dust Emissions behind Porous Fences Used to Shelter Open Storage Piles

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