Oxygen transfer study and modeling of plunging hollow jets

Experiments were performed to study the effect of jet angle of hollow jet aerators on oxygen transfer of water. Three jet angles of 30A degrees, 45A degrees and 60A degrees were used to produce hollow jets impingement on the water in the pool. Results from experimental study showed a significant effect of hollow jet angle on volumetric oxygen transfer coefficient (K (L) a) at higher jet velocities. Standard oxygen transfer efficiency (SOTE) of 60A degrees hollow jet aerators is observed higher with low-kinetic-power jets, but at higher kinetic power, 30A degrees hollow jet aerator is observed to be the best in terms of SOTE. Moreover, modeling performance of the experimental data is evaluated by training and testing of the models, and empirical equations derived from multiple linear and multiple nonlinear regression techniques are compared with artificial neural network approach. The results of the present study are also compared with the previous studies of plunging jet aerators.