De-Entrainment of Liquid on Vertical Rods in Air/Water Cross Flow

Liquid holdup on a 101.6-mm-diam, 0.5588-m-long vertical rod has been measured in air/water cross flow at various air and water flow rates. The measurement technique involved the use of band-type capacitance probes, which are capable of measuring the average liquid film thickness around the rod circumference. The probe is able to provide useful information in the presence of non-uniform films around the rod as well as in rivulet flows. The data are shown to be consistent with previously obtained data on liquid drainage flow rates for a variety of air and water incident flow rates. A simple model, based on laminar flow theory, reasonably explains the trends in film thickness variation.