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DISPER: 16 air quality management 17 air quality guidelines 18  outdoor air pollution 19 air pollution cause 20 environmental science 21 environmental monitoring 22 environmental impact assessment 23 indoor air quality 24 environmental assesment 25 air monitoring 26 modelling emissions 27 software pollution 28 environmental engineering 29 atmospheric pollution 30 air pollution  31 environmental maps

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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 Fb < 55,

(DT)c=0.0297 Ts(vs/ds2)1/3      (9)

and for Fb >= 55,

(DT)c=0.00575 Ts(vs2/ds)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, xf, is assumed to be 3.5x*, where x* is the distance at which atmospheric turbulence begins to dominate entrainment. The value of xf is calculated as follows:

for Fb < 55:

xf=49Fb5/8      (11)

and for Fb >= 55:

xf=119Fb2/5     (12)

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

for Fb < 55:

he=hs+(21.425 Fb3/4/us)    (13)

and for Fb = 55:

he=hs+(38.71 Fb3/5/us)          (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:

he=hs+3ds(vs/us)     (15)

Briggs suggests that this equation is most applicable when vs/us 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.