The Hydraulic Characteristics of Trays under Oscillation

Abstract

Experimental studies of hydraulic characteristics, i.e. weeping, entrainment, stable operating region and the effect of baffles have been conducted in an air-water system using perforated trays. For the low liquid flow region, the amount of entrainment when the tray oscillates is larger than when the tray does not oscillate, but this trend is reversed for the high liquid flow region. The amount of entrainment increases with the decrease in period of oscillation. If the F-factor is less than 1.0, the amount of weeping when the tray oscillates is larger than when it does not, but this trend is reversed if the F-factor is greater than 1.0.
It is found that the stable operating region in which the tray oscillates becomes smaller than that in which it does not oscillate. From the experimental results, it is found that the optimum number of baffles is two and the optimum baffle height is approximately the same as that of the outlet weit. Using baffles decreases the pressure drop difference. However, there is a small increase in the amount of weeping, entrainment, pressure drop and static liquid seal.