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1.1.4.1 Stack‑tip Downwash.

     In order to consider stack‑tip downwash, modification of the physical stack height is performed following Briggs (1974, p. 4).  The modified physical stack height hs´ is found from:

where hs is physical stack height (m), vs is stack gas exit velocity (m/s), and ds is inside stack top diameter (m).  This hs´ is used throughout the remainder of the plume height computation.  If stack tip downwash is not considered, hs´ = hs in the following equations.

 

1.1.4.2 Buoyancy and Momentum Fluxes.

     For most plume rise situations, the value of the Briggs buoyancy flux parameter, Fb (m4/s3), is needed.  The following equation is equivalent to Equation (12), (Briggs, 1975, p. 63):

where ΔT = Ts - Ta, Ts is stack gas temperature (K), and Ta is ambient air temperature (K).

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

 

 

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