Oxygen transfer study and modeling of plunging hollow jets

Abstract

Experiments were performed to study the effect of jet angle of hollow jet aerators on oxygen transfer of water. Three jet angles of 30°, 45° and 60° 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 60° hollow jet aerators is observed higher with low-kinetic-power jets, but at higher kinetic power, 30° 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.

Effect of Power Pump and Nozzle Diameter Microbubble Generator to Increase Oxygen Concentration in Aquaculture

“…According to Abdelrahman and Boyd (2018), the higher the pump's power, the higher the performance system aeration system. Kumar et al(2018) high power microbubble performance are comparable to low power.…”

Experimental Study on Oxygen Mass Transfer Characteristics by Plunging Hollow Jets

“…The Fig. 1 Single hollow jet aerator [12] cone is mounted on a bolt (5 mm diameter) by the threading arrangement which is connected to a bolt holder (14 mm diameter). Centring and fixing screws (3 pair of screws having 3 mm diameter) are used to maintain and fix the bolt holder at the centre of the discharging pipe.…”

“…1 [12]. The exit end of the pipe wall is maintained parallel to the apex side of the cone so that a uniform jet is issued at the outset of the device.…”

“…Emiroglu and Baylar [10] studied the influence of air holes provided at the convergent and divergent section of a venturi device and investigated the aeration properties namely air entrainment rate, bubble penetration depth and oxygen transfer efficiency of plunging jets. Deswal and Verma [11] and Kumar et al [12] con-ducted studies on conical plunging hollow jet aerators and proposed some predictive relationships based on the oxygen transfer. Singh et al [7] studied the oxygen transfer and penetration depth of plunging jets discharging through the openings of various geometries and found encouraging aeration performance of rounded rectangular jets in comparison with circular, square and rectangular jets; the aeration results are then explained as a function of velocity and kinetic power of plunging jets.…”

“…The impact of various jet parameters investigated in the previous studies is mainly concentrated on plunging solid jets of various shapes. Some researchers attempted to study the oxygenation by the plunging hollow jets and the performances of these types of jets are observed competitive and even better in comparison with some of the previous studies on plunging jets [1,11,12]. Therefore, a detailed investigation on plunging hollow jets is required to examine the oxygenation properties.…”