where b is the distance from the center line to the collector plate and Aj is the smallest positive solution to the preceding transcedental equation.

The Deutsch-Andersen equation and other efficiency theories are limiting cases of this general theory. To use this exact theory, an environmental engineer has to first decide on appropriate mixing coefficients. For a large D2

(i.e., large transverse mixing), the equation for efficiency reduces to the following equation:

v= 1

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