Oxygen Transfer Numerical Investigation Using Intermittent Aeration Technology Under Regular Waves

Yin, Zegao; Yu, Ning; Wang, Yanxu; Jin, Lu

Oxygen Transfer Numerical Investigation Using Intermittent Aeration Technology Under Regular Waves

2018

Yin, Zegao | Yu, Ning | Wang, Yanxu | Jin, Lu

Based on a combination of Reynolds-Averaged Navier-Stokes equations, standard k-ε equations, and VOF technique, a 2-D dissolved oxygen transport mathematical model was conducted to investigate oxygen-supply characteristics for regular waves with a given still water depth d and various hydrodynamic parameters (incident wave height H and wave period T equivalent to incident wave length L) and intermittent aeration parameters (air flow rate per unit width q, aeration period Tₐ, aeration depth dₐ and air source area Aₐ). A series of experiments were conducted to validate the mathematical model, and they agreed well with each other. In addition, a series of dimensionless parameters were conducted to assess their relationships with oxygen transfer coefficient respectively. It was found that oxygen transfer coefficient increased slightly with the increase of [Formula: see text]. With the increasing [Formula: see text], oxygen transfer coefficient increased obviously for the small [Formula: see text] scenarios; however, it increased slightly for the high [Formula: see text] scenarios. With increasing HL/d², a linear increase tendency of oxygen transfer coefficient appeared approximately. Furthermore, a simple prediction formula for oxygen transport coefficient was conducted using the numerical data, the dimensional analysis, and the least squares method, and it was validated well with the related experimental data.

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