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Canarina DISPER software · air · environmental impact assessment · algorithms 11

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Canarina DISPER software · air · environmental impact assessment 

 

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.

Stability Parameter.

For stable situations, the stability parameter, s, is calculated:

s=g[(dT/dz)/Ta]         (16)

 

As a default approximation, for stability class E (or 5) dT/dz is taken as 0.020 K/m, and for class F (or 6), dT/dz is taken as 0.035 K/m.

Stable - 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 (DT)c  is determined and solving for DT, as follows:

 

(DT)c=0.019582 Ts vs s1/2      (17)

 

If the difference between DT exceeds or equals (DT)c, plume rise is assumed to be buoyancy dominated, otherwise plume rise is assumed to be momentum dominated.

 

 

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Canarina DISPER software · air · environmental impact assessment 

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