De-entrainment of liquid on vertical rods in air-water cross flow

Liquid holdup on a vertical rod (101.6 mm diameter, 0.5588 m long) 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 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 obtained 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, is shown to reasonably explain the trends in film thickness variation