(4a) The Colwell Equation -  More Than Just a Clear Liquid Height Model

The Colwell equation was proposed as a means of calculating the equivalent clear liquid height on trays.  The Colwell equation can also be used to estimate other variables that are important in the design of trays.  In this paper the methodology of using the Colwell model for these calculations will be discussed and it will be shown that this approach yields good agreement with experimental measurements.