The correlation from Rocha is suitable for structured packings. The equation was taken from the following publication:
Rocha, Bravo, Fair: Distillation Columns Containing Structured Packings: A comprehensive model for their performance. 2. Mass Transfer Model, Ind. Eng. Chem. Res., 1996, 35, 1660-1667
Documentation last revised: 18.7.2011