Experimental observations of a bifurcated buoyant plume

Fanaki, F.

doi:10.1007/bf00223395

Cited by 17 publications

(3 citation statements)

References 8 publications

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“…The SO 2 -NO x ratios for the two plumes are similar, and neither plume was observed upwind of the power plant, which leads us to believe that both plumes originate from the Conesville power plant. Since the power-plant stacks are much closer than the distance between the center of the plumes (∼3 km), the plume must have bifurcated either due to complex flows at the stack (Fanaki, 1975) or due to topographic effects from hills in the region. The boundary layer at the Conesville power generation facility was very stable until sunrise, ∼5 h before the observations were made, which may favor bifurcation of the plume at the stack.…”

Section: Conesvillementioning

confidence: 99%

Nucleation and growth of sulfate aerosol in coal-fired power plant plumes: sensitivity to background aerosol and meteorology

et al. 2012

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Abstract. New-particle formation in the plumes of coalfired power plants and other anthropogenic sulfur sources may be an important source of particles in the atmosphere. It remains unclear, however, how best to reproduce this formation in global and regional aerosol models with grid-box lengths that are 10s of kilometers and larger. The predictive power of these models is thus limited by the resultant uncertainties in aerosol size distributions. In this paper, we focus on sub-grid sulfate aerosol processes within coal-fired power plant plumes: the sub-grid oxidation of SO 2 with condensation of H 2 SO 4 onto newly-formed and pre-existing particles. We have developed a modeling framework with aerosol microphysics in the System for Atmospheric Modelling (SAM), a Large-Eddy Simulation/Cloud-Resolving Model (LES/CRM). The model is evaluated against aircraft observations of new-particle formation in two different power-plant plumes and reproduces the major features of the observations. We show how the downwind plume aerosols can be greatly modified by both meteorological and background aerosol conditions. In general, new-particle formation and growth is greatly reduced during polluted conditions due to the large pre-existing aerosol surface area for H 2 SO 4 condensation and particle coagulation. The new-particle formation and growth rates are also a strong function of the amount of sunlight and NO x since both control OH concentrations. The results of this study highlight the importance for improved sub-grid particle formation schemes in regional and global aerosol models.

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Section: Conesvillementioning

confidence: 99%

Nucleation and growth of sulfate aerosol in coal-fired power plant plumes: sensitivity to background aerosol and meteorology

et al. 2012

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“…At cross section B, the edge of the plume is sheared off by the wind thus resulting in a kidney-shaped cross section. Thereafter at cross section C where the plume is fully bent-over, the dilution process is dominated by the interaction between the two counter-rotating line vortices and the ambient crossflow [43] 33%, even though the associated dissipation rates were approximately two orders of magnitude smaller than the plume turbulence dissipation rates. Not surprisingly, the turbulent crossflow was also found to decrease the plume rise height, which can be accounted for by adopting a modified entrainment coefficient, i.e.…”

Section: Ground Heating Obstaclementioning

confidence: 97%

Cooling tower plume abatement and plume modeling: a review

Flynn

2021

Environ Fluid Mech

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Visible plumes above wet cooling towers are of great concern due to the associated aesthetic and environmental impacts. The parallel path wet/dry cooling tower is one of the most commonly used approaches for plume abatement, however, the associated capital cost is usually high due to the addition of the dry coils. Recently, passive technologies, which make use of free solar energy or the latent heat of the hot, moist air rising through the cooling tower fill, have been proposed to minimize or abate the visible plume and/or conserve water. In this review, we contrast established versus novel technologies and give a perspective on the relative merits and demerits of each. Of course, no assessment of the severity of a visible plume can be made without first understanding its atmospheric trajectory. To this end, numerous attempts, being either theoretical or numerical or experimental, have been proposed to predict plume behavior in atmospheres that are either uniform versus density-stratified or still versus windy (whether highly-turbulent or not). Problems of particular interests are plume rise/deflection, condensation and drift deposition, the latter consideration being a concern of public health due to the possible transport and spread of Legionella bacteria.

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“…According to middle clouds and upper-level winds, the plume height appeared to be at the level of 2.5 -3.0 km. Fanaki (1975) suggested, however, that two plumes from a tall stack may travel downwind either at the same height or at different heights. Figure 3 shows 5-day forward trajectories starting at Augustine Island.…”

Section: Other Inputsmentioning

confidence: 99%

Concentrations of atmospheric constituents observed at Alert, Canada, in relation to air trajectories and synoptic systems

Chung

1989

J Atmos Chem

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Experimental observations of a bifurcated buoyant plume

Cited by 17 publications

References 8 publications

Nucleation and growth of sulfate aerosol in coal-fired power plant plumes: sensitivity to background aerosol and meteorology

Nucleation and growth of sulfate aerosol in coal-fired power plant plumes: sensitivity to background aerosol and meteorology

Cooling tower plume abatement and plume modeling: a review

Concentrations of atmospheric constituents observed at Alert, Canada, in relation to air trajectories and synoptic systems

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