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Algorithms IV · software · air pollution effects

Unstable or Neutral - Crossover Between Momentum and Buoyancy

For cases with stack gas temperature greater than or equal to ambient temperature, it must be determined whether the plume rise is dominated by momentum or buoyancy. The crossover temperature difference, (DT)_c, is determined as follows:

for F_b < 55,

(DT)_c=0.0297 T_s(v_s/d_s²)^1/3      (9)

and for F_b >= 55,

(DT)_c=0.00575 T_s(v_s²/d_s)^1/3     (10)

If DT, exceeds or equals (DT)_c, plume rise is assumed to be buoyancy dominated, otherwise plume rise is assumed to be momentum dominated.

Unstable or Neutral - Buoyancy Rise

For situations where DT exceeds (DT)_c as determined above, buoyancy is assumed to dominate. The distance to final rise, x_f, is assumed to be 3.5x^*, where x^* is the distance at which atmospheric turbulence begins to dominate entrainment. The value of x_f is calculated as follows:

for F_b < 55:

x_f=49F_b^5/8      (11)

and for F_b >= 55:

x_f=119F_b^2/5     (12)

The final effective plume height, h_e (m), is determined as

for F_b < 55:

h_e=h_s+(21.425 F_b^3/4/u_s)    (13)

and for F_b = 55:

h_e=h_s+(38.71 F_b^3/5/u_s)          (14)

Unstable or Neutral - Momentum Rise

For situations where the stack gas temperature is less than or equal to the ambient air temperature, the assumption is made that the plume rise is dominated by momentum. If DT is less than (DT)_c, the assumption is also made that the plume rise is dominated by momentum. The plume height is calculated as:

h_e=h_s+3d_s(v_s/u_s)     (15)

Briggs suggests that this equation is most applicable when v_s/u_s is greater than 4.

air pollution effects

Air pollution effects: At the present time, numerous universities and study centers use this program for teaching and education. The vehicle emission modeling  can be realized with this software.

DISPER software: indoor air quality solutions environmental science and health air emission monitoring environmental assessment industry air pollution pollution in our atmosphere vehicles air pollution gas dispersion modeling indoor air quality measurement acid rain and air pollution industrial air exhaust air pollution effects acid rain pollution air quality monitoring air pollution model air quality management air quality guidelines outdoor air pollution air pollution cause environmental science environmental monitoring environmental impact assessment  indoor air quality  environmental assesment air monitoring modelling emissions software · pollution environmental engineering atmospheric pollution air pollution  environmental maps