Plunging hollow jet aerators - oxygen transfer and modelling
Munish Kumar, Subodh Ranjan, Nand Kumar Tiwari, Rakesh Kumar Gupta · ISH Journal of Hydraulic Engineering · 2017
Jet aeration is usually associated with creation of large air–water interfacial area and low energy loss, particularly in not-too-big a tank, thus, making it an efficient oxygenation system. If an aeration device is so designed as to produce a plunging hollow jet, the oxygen transfer is reported to have been much enhanced. Experiments have been conducted on three 60° plunging jet aerators having different configurations viz. plain, curved and the plain-modified shaped. Amongst the three configurations tested, the curved-shaped device is observed to be the most efficient one, giving higher oxygen transfer efficiency values particularly for jet velocity exceeds about 4 m/s. Further a non-linear relationship of volumetric oxygen transfer coefficient () is obtained for curved-shaped hollow jet aerator and the modelling performance is compared with GP regression approach. The performance of modelling techniques evaluated on the basis of statistical parameters (R2, RMSE) suggested that GP regression using RBF kernel performed considerably better followed by GP regression using poly kernel and non-linear regression in predicting based on jet input parameters. The modelling approaches were further compared with the relationships proposed by previous researchers.