Plunging hollow jet aerators - oxygen transfer and modelling. Issue 1 (2nd January 2018)

• Record Type: Journal Article
• Authors: Kumar, Munish; Ranjan, Subodh; Tiwari, N. K.; Gupta, Rakesh
• Is Part Of: ISH journal of hydraulic engineering. Volume 24:Issue 1(2018)
• Page Start: 61
• Page End: 67
• Publication Date: 2018-01-02
• Subjects: Aeration -- hollow jet aerator -- overall oxygen transfer coefficient -- oxygen transfer efficiency -- GP regression; Hydraulic engineering -- Periodicals; Hydraulic engineering -- India -- Periodicals; Hydraulic engineering; India; Periodicals; 627
• DOI: 10.1080/09715010.2017.1348264
• Languages: English
• ISSNs: 0971-5010

Abstract

Abstract: 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 ( R 2, 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.