A wind-tunnel study on exhaust-gas dispersion from road vehicles—Part II: Effect of vehicle queues

Kanda, Isao; Uehara, Kiyoshi; Yamao, Yukio; Yoshikawa, Yuki; Morikawa, Tazuko

doi:10.1016/j.jweia.2006.06.002

Cited by 26 publications

(13 citation statements)

References 5 publications

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“…With respect to high-level sources, the Gaussian Plume Model (GPM) [1,2] is usually used to estimate pollutant concentrations, where obstacles (such as buildings) have little influence on the diffusion characteristics of pollutants at such levels. In the case of low-level sources, it is not easy to estimate the pollutant concentrations using GPM due to the effect of surrounding obstacles which make pollutant removal efficiency by the wind vary from one location to another within the same domain.…”

Section: Introductionmentioning

confidence: 99%

Towards the application of indoor ventilation efficiency indices to evaluate the air quality of urban areas

Bady

Kato

Huang

2008

Building and Environment

125

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Section: Introductionmentioning

confidence: 99%

Towards the application of indoor ventilation efficiency indices to evaluate the air quality of urban areas

Bady

Kato

Huang

2008

Building and Environment

125

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“…They found that the buoyancy of the exhaust had generally a minor effect on the dispersion behaviour. The results from this study were then used as a basis for studying multi-vehicle configurations (Kanda et al, 2006b), with an approach similar to the one adopted by Clifford et al (1997) in the wind tunnel.…”

Section: Dispersion Of Inert Tracers In the Vehicle Wakementioning

confidence: 99%

An overview of experimental results and dispersion modelling of nanoparticles in the wake of moving vehicles

Carpentieri

Kumar

Robins

2011

Environmental Pollution

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“…Regarding high-level sources, the Gaussian plume model (Kanda et al, 2006) is typically used to estimate pollutant concentrations; at such levels, obstacles (such as buildings) have little effect on the diffusion characteristics of pollutants. In addition to Gaussian type models, high-level sources can be simulated using computational fluid dynamics (CFD), which is more appropriate for complex situations.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Dust Particle Transport Performance within Urban Street Canyons with Different Building Heights

Mercola

Deng

et al. 2016

Aerosol Air Qual. Res.

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In developing cities, buildings with different heights obstruct the diffusion of pollutants. In this study, dust particles transported within urban street canyons were simulated using Reynolds-averaged Navier-Stokes (RANS) method, and airsolid two-phase flow fields were obtained on a regional scale. Four typical street building models were used in this study: (a) low-rise buildings (H/b = 1), (b) step-up building arrangements (H/b = 1, 2, 3, 4, 5), (c) step-down building arrangement (H/b = 5, 4, 3, 2, 1), and (d) high-rise buildings (H/b = 5). The particle volume fraction distribution in the four models reflected the basic properties of particle transportation in the canyons. Vortices were observed on the roofs of street canyons, which prevented particles from being transmitted into the canyons, and the vortex regions were characterized as low particle concentration.To evaluate the dust particle transport performance in the models, three indices, namely particle transport efficiency, suspension fraction and suspension density, were defined. These concepts were based on the particle number concentrations, which were obtained using the Lagrange approach. The high-rise building model (H/b = 5) demonstrated the lowest transport efficiency among all four models, and it also had the lowest suspension density in the street canyons. This implied that the high-rise buildings hindered the particles from being transporting further and that the particles could not enter the deep canyons easily. In the step-down building arrangement model (H/b = 5, 4, 3, 2, 1), the particle concentration level and suspension density in the canyons were lower than those observed in the step-up building arrangement model (H/b = 1, 2, 3, 4, 5), indicating that a step-down building height arrangement is appropriate for creating construction plans for developing cities.Finally, the variation of the streamwise air velocity, vertical velocity and fluctuating velocity on the roof of canyons along the x direction were separately examined. Notably, the fluctuating velocity was the dominant mechanism of the particle suspension in the canyons.

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A wind-tunnel study on exhaust-gas dispersion from road vehicles—Part II: Effect of vehicle queues

Cited by 26 publications

References 5 publications

Towards the application of indoor ventilation efficiency indices to evaluate the air quality of urban areas

Towards the application of indoor ventilation efficiency indices to evaluate the air quality of urban areas

An overview of experimental results and dispersion modelling of nanoparticles in the wake of moving vehicles

Evaluating Dust Particle Transport Performance within Urban Street Canyons with Different Building Heights

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