The effects of the number and angle of microgrooves on the liquid film in horizontal annular two-phase flow

摘要

Measurements of the liquid film profile and pressure drop were made in tubes with grooves of varying angle (0°, 9° and 18°) as well as tubes with varying numbers of grooves at a common angle (18°). These data indicate that the grooves act to redistribute the liquid film on the inner wall perimeter and that only a relatively small number of grooves (12) is needed to do this. The grooves also affect the stability of the vapor-liquid interface and can generate lower average liquid film thickness. The pressure loss is directly related to the number of grooves for the tubes studied.