Using models to interpret the impact of roadside barriers on near-road air quality

Amini, Seyedmorteza; Ahangar, Faraz Enayati; Schulte, Nico; Venkatram, Akula

doi:10.1016/j.atmosenv.2016.05.001

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…Several studies have evaluated the influence of solid barriers on near-road air quality (Amini et al, 2016;Baldauf et al, 2016;Hagler et al, 2011;Pournazeri and Princevac, 2015;Schulte et al, 2014;Steffens et al, 2014Steffens et al, , 2013. Solid barriers induce a significant vertical mixing and shift the plume upward through an induced updraft motion.…”

Section: Introductionmentioning

confidence: 99%

The influence of roadside solid and vegetation barriers on near-road air quality

Ghasemian

Amini

Princevac

2017

Atmospheric Environment

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Section: Introductionmentioning

confidence: 99%

The influence of roadside solid and vegetation barriers on near-road air quality

Ghasemian

Amini

Princevac

2017

Atmospheric Environment

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“…The study concluded that all 12 configurations reduced the downstream near-ground concentration compared with that for a flat and unobstructed roadway [6]. Amini et al, 2016, found that a 4 m high barrier resulted in a 35% reduction in average concentration within 40 m of the barrier, relative to the no-barrier site. Also, the concentration reduction could be 55% if the barrier height was doubled [7].…”

Section: Introductionmentioning

confidence: 93%

“…Amini et al, 2016, found that a 4 m high barrier resulted in a 35% reduction in average concentration within 40 m of the barrier, relative to the no-barrier site. Also, the concentration reduction could be 55% if the barrier height was doubled [7]. Previous research also focused on noise barrier side edge effects under different thermal conditions, but only rectangular noise barriers were studied [8].…”

Section: Introductionmentioning

confidence: 98%

Modeling and Analysis of the Effects of Noise Barrier Shape and Inflow Conditions on Highway Automobiles Emission Dispersion

Wang

2019

Fluids

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Recent research has suggested that noise barriers have significant impacts on near-road automobile emissions reduction. T-shaped noise barriers have better performance on reducing noise than others, however, their effects on automobile emissions reduction are not clear. In this research, commercial software ANSYS ® Fluent 19.2 (Ansys Inc., Canonsburg, PA, USA) was applied to simulate the noise barrier shape and different inflow wind shear condition effects on highway automobiles emission dispersion. Various Reynolds Averaged Navier-Stokes (RANS) models were tested. The realizable k-ε turbulence model was selected to simulate the turbulent flow caused by fast moving vehicles on highway based on the comparison results. A non-reacting species transport model was applied to simulate emission dispersion. Results showed that the T-shaped barrier was able to help reduce highway automobiles emission concentration in downstream areas more than the rectangular barrier. An optimized range of the T-shape was proposed; under the inflow condition without wind shear, the noise barrier shape effects on automobiles emission reduction were not significant.

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“…Previous studies showed that noise barriers can lead to an upward deflection of airflow caused by the structure. Thus, these barriers could increase the apparent release height of the pollutant, leading to more vertical mixing due to the flow separation at the top of the barrier [46][47][48][49][50]. More importantly, as a huge flux of transport energy in terms of weight, speed, volume, and noise, highway systems generate vast amounts of wasted energy due to inefficient consumption, particularly through large-sized-engine vehicles.…”

Section: Introductionmentioning

confidence: 99%

Entrapment of Airborne Particles via Simulated Highway Noise-Induced Piezoelectricity in PMMA and EPDM

et al. 2022

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The US highway system features a huge flux of energy transportation in terms of weight, speed, volume, flow density, and noise levels, with accompanying environmental effects. The adverse effects of high-volume traffic cause health concerns for nearby residential areas. Both chronic and acute exposure to PM 2.5 have detrimental effects on respiratory and cardiovascular health, and motor vehicles contribute 25–35% of direct PM 2.5 emissions. In addition to traffic-related pollutants, residing near major roadways is also associated with exposure to increased noise, and both affect the health and quality of life of residents. While regulatory and policy actions may reduce some exposures, engineering means may offer novel and significant methods to address these critical health and environmental issues. The goal of this study was to harvest highway-noise energy to induce surface charge via a piezoelectric material to entrap airborne particles, including PM 2.5. In this study, we experimentally investigated the piezoelectric effect of a polymethyl methacrylate (PMMA) sheet and ethylene propylene diene monomer (EPDM) rubber foam on the entrapment of copper (II)-2,4 pentanedione powder (Cu II powder). Appreciable voltages were induced on the surfaces of the PMMA via mechanical vibrations, leading to the effective entrapment of the Cu II powder. The EPDM rubber foam was found to attract a large amount of Cu II powder under simulated highway noise in a wide range, of 30–70 dB, and at frequencies of 700–1300 Hz, generated by using a loudspeaker. The amount of Cu II powder entrapped on the EPDM rubber-foam surfaces was found to scale with the SPL, but was independent of frequency. The experimental findings from this research provide a valuable base for the design of a robust piezoelectric system that is self-powered by harvesting the wasted sound energy from highway noise and reduces the amount of airborne particles over highways for effective environmental control.

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Using models to interpret the impact of roadside barriers on near-road air quality

Cited by 15 publications

References 18 publications

The influence of roadside solid and vegetation barriers on near-road air quality

The influence of roadside solid and vegetation barriers on near-road air quality

Modeling and Analysis of the Effects of Noise Barrier Shape and Inflow Conditions on Highway Automobiles Emission Dispersion

Entrapment of Airborne Particles via Simulated Highway Noise-Induced Piezoelectricity in PMMA and EPDM

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