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Algorithms III · software · acid rain pollution

Plume Rise Formulas

The plume height is used in the calculation of the Vertical Term. The distance dependent momentum plume rise equations are used to determine if the plume is affected by the wake region for building downwash calculations. 

Stack-tip Downwash

In order to consider stack-tip downwash, modification of the physical stack height is performed. The modified physical stack height h_s is found from:

h_s’=h_s+2d_s[(v_s/u_s)-1.5]   for  v_s<1.5u_s      (5)

or

h_s’=h_s                   for v_s> o =1.5u_s   (6)

where h_s is physical stack height (m), v_s is stack gas exit velocity (m/s), and d_s is stack top diameter (m). If stack tip downwash is not considered, h_s’= h_s in the following equations.

Buoyancy and Momentum Fluxes

For most plume rise situations, the value of the Briggs buoyancy flux parameter, F_b (m⁴/s³), is needed

F_b=gv_sd_s²(DT/4T_s)    (7)

where DT = T_s - T_a, T_s is stack gas temperature (K), and T_a is ambient air temperature (K).

For determining plume rise, the momentum flux parameter, F_m (m⁴/s²), is calculated based on the following formula:

F_m=gv_s²d_s²(T_a/4T_s)    (8)

software · acid rain pollution

DISPER software solutions: This application has been used in great number of environmental reports, air pollution courses and air pollution studies in the last years. We currently have users in more than 10 countries.

impact assessments: dispersion model - dispersion modeling - dispersion modelling -

chemical plants: gas dispersion - pollution dispersion - air deposition -

industries: air ambient - air nox - air polution -

Roads: air waves - air pressure - waves dispersion -

Italy: urban dispersion - air transport model - stack dispersion -

impact assessments: air quality dispersion modeling - roadway air dispersion modeling - air dispersion modeling software -

chemical plants: air dispersion modelling guideline - air dispersion modelling guideline - fabric air dispersion -

Aberdeen - atmospheric dispersion - dispersion models - lagrangian dispersion -

Armagh - mixing dispersion -

Bangor - air quality consulting - air quality testing - environmental training -

Bath - plume dispersion - aermod dispersion - adms dispersion -

Belfast - indoor air quality - air quality modeling - air quality test -

Birmingham - air quality modelling - air pollution modeling - air pollution control - air quality -

Bradford - air quality dispersion - air pollutant dispersion - air pollution dispersion modelingair quality dispersion modelling -

Brighton & Hove - air dispersion modelling - air dispersion model - air dispersion modeling -

Bristol - dispersion - air plume - pollutant dispersion -

Cambridge - dispersion of air - roadway air dispersion - the dispersion of air -

Canterbury - air dispersion software - and air dispersion - dispersion in air -

Cardiff - density dispersion - density air - air class -

Carlisle - air functions - air data - air dispersion -

Chester - for air dispersion modeling -

City of London - environment health - natural environment - report pollution -