A three-dimensional plume rise model for dry and wet plumes

Janicke, Ulf; Jänicke, L.

doi:10.1016/s1352-2310(00)00372-1

Cited by 27 publications

(23 citation statements)

References 25 publications

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“…The case F E = 23. 8 to small perturbations while the other is not, or perhaps both may exist depending on the flow history. Unsteady calculations may be necessary to resolve this.…”

Section: Resultsmentioning

confidence: 99%

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Steady flow of a buoyant plume into a constant-density layer

Hocking

Forbes

2009

J Eng Math

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The upward flow of a buoyant plume emanating from a horizontal fissure into a two-layered fluid region is considered. Solutions are computed numerically for a range of fissure widths and water depths. It is shown that for a given fluid depth and fissure size there is a minimum flow rate beneath which no steady solutions exist. At this limiting flow, the fluid detaches from the wall of the fissure via a stagnation point. Solutions exist for all values of flow rate above this minimum. Exact solutions are presented for very large flow rates.

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“…The case F E = 23. 8 to small perturbations while the other is not, or perhaps both may exist depending on the flow history. Unsteady calculations may be necessary to resolve this.…”

Section: Resultsmentioning

confidence: 99%

“…These flows are extremely complicated and modern approaches usually involve sophisticated numerical methods and experiments; see e.g. [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Steady flow of a buoyant plume into a constant-density layer

Hocking

Forbes

2009

J Eng Math

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“…A validated, moist plume rise model called "IBJpluris" has been found to accurately predict the final rise of a moist plume (Janicke and Janicke, 2001) and can be used to complement the dispersion modeling process when moisture content can be a significant factor. The IBJpluris model formulation includes a general solution for bent-over moist (initially saturated) chimney plumes (Janicke and Janicke, 2001).…”

Section: Effects Of a Moist Plume On Plume Rise Calculationsmentioning

confidence: 99%

“…The IBJpluris model formulation includes a general solution for bent-over moist (initially saturated) chimney plumes (Janicke and Janicke, 2001). The model was reviewed by Presotto et al (2005), which indicated that despite a number of entrainment formulas available, IBJpluris possessed the physical capability of representing the impacts of heat of condensation on symmetric chimney plume rise.…”

Section: Effects Of a Moist Plume On Plume Rise Calculationsmentioning

confidence: 99%

“…A procedure to incorporate the moist plume effect by adjusting the input exit temperature data can be performed prior to an AERMOD model analysis using a pre-processor called "AERMOIST." This pre-processor makes use of a European validated plume rise model called "IBJpluris" that already incorporates moist plume effects and has been found to accurately predict the final rise of a moist plume (Janicke and Janicke, 2001;Janicke Consulting, 2015). The adjustments to plume rise using IBJpluris with and without moist plume effects can be transferred to AERMOD (or other models, as appropriate) by adjusting the input stack temperature of each affected source on an hourly basis, as a function of ambient temperature and relative humidity.…”

Section: Introductionmentioning

confidence: 99%

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Source characterization refinements for routine modeling applications

Paine¹,

Warren²,

Moore³

2016

Atmospheric Environment

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h i g h l i g h t sDispersion modeling source characterizations for unique facilities are described. Highly industrialized areas causing a heat island effect can be modeled as urban. Stacks with waste heat countering downwash can apply weighting to these effects. Extra rise for moist plumes is realistically estimated for use in "dry" models. Stacks in a row with merged plumes can be better represented to improve modeling. a b s t r a c t Steady-state dispersion models recommended by various environmental agencies worldwide have generally been evaluated with traditional stack release databases, including tracer studies. The sources associated with these field data are generally those with isolated stacks or release points under relatively ideal conditions. Many modeling applications, however, involve sources that act to modify the local dispersion environment as well as the conditions associated with plume buoyancy and final plume rise. The source characterizations affecting plume rise that are introduced and discussed in this paper include: 1) sources with large fugitive heat releases that result in a local urbanized effect, 2) stacks on or near individual buildings with large fugitive heat releases that tend to result in buoyant "liftoff" effects counteracting aerodynamic downwash effects, 3) stacks with considerable moisture content, which leads to additional heat of condensation during plume rise e an effect that is not considered by most dispersion models, and 4) stacks in a line that result in at least partial plume merging and buoyancy enhancement under certain conditions. One or more of these effects are appropriate for a given modeling application. We present examples of specific applications for one or more of these procedures in the paper.This paper describes methods to introduce the four source characterization approaches to more accurately simulate plume rise to a variety of dispersion models. The authors have focused upon applying these methods to the AERMOD modeling system, which is the United States Environmental Protection Agency's preferred model in addition to being used internationally, but the techniques are applicable to dispersion models worldwide. While the methods could be installed directly into specific models such as AERMOD, the advantage of implementing them outside the model is to allow them to be applicable to numerous models immediately and also to allow them to remain applicable when the dispersion models themselves are updated. Available evaluation experiences with these techniques, which are discussed in the paper, indicate improved model performance in a variety of application settings.

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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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A three-dimensional plume rise model for dry and wet plumes

Cited by 27 publications

References 25 publications

Steady flow of a buoyant plume into a constant-density layer

Steady flow of a buoyant plume into a constant-density layer

Source characterization refinements for routine modeling applications

Cooling tower plume abatement and plume modeling: a review

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