Oxygen Transfer by Multiple Vertical Plunging Jets in Tandem

Chipongo, Kudzai; Khiadani, Mehdi

doi:10.1061/(asce)ee.1943-7870.0001145

Cited by 9 publications

(10 citation statements)

References 32 publications

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“…The tank water surface becomes unstable as the jet impact velocity increases and the entrainment of air into the tank water occurs by both the increased contact between the water jet and the water pool, as well as the increased jet surface roughness. The impact of jet velocity by the falling cylindrical solid jets on the rate of oxygen mass transfer into the water is investigated in previous studies [5,11,14,23]. The trend of the jet velocity results in this study is very similar to the findings of the previous studies.…”

Section: Impact Of Jet Velocity and Jet Thicknesssupporting

confidence: 85%

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Experimental Study on Oxygen Mass Transfer Characteristics by Plunging Hollow Jets

2020

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Aeration by plunging water jets is an effective and economical method of transferring oxygen into the receiving pool of water. A dispersion of air bubbles occurs underneath the pool surface as a high-velocity liquid jet plunges on the water surface after being ejected from a particular fall height. The present study aims to investigate the impact of jet velocity, jet length, water depth and jet thickness of plunging hollow jets in oxygenating the water in the aeration tank. Empirical correlations are proposed for the determination of volumetric oxygen transfer coefficient based on jet velocities and jet kinetic powers. Moreover, the oxygen transfer capacity of single hollow jet, double hollow jet and a dual jet (combined hollow and solid) is tested by keeping a nearly constant jet flow area through the jet openings. The observations recorded from the experimental analysis lead to the development of predictive relationships for estimating the values of volumetric oxygen transfer coefficient in terms of basic jet variables. KeywordsSingle hollow jet • Double hollow jet • Jet length • Oxygen transfer • Jet velocity B Munish Kumar

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Section: Impact Of Jet Velocity and Jet Thicknesssupporting

confidence: 85%

“…of jets performed better with high kinetic powers. Chipongo and Khiadani [14] conducted oxygen transfer study with multiple tandem jets plunging into a flume of moving water and investigated the effect of no. of jets, jet velocity, jet length and water depth.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Oxygen Mass Transfer Characteristics by Plunging Hollow Jets

2020

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“…The volumetric oxygen transfer coefficient (K L a) T is the slope of semilogarithmic plot of the DO deficit against time (Ashley et al 2013;Chipongo and Khiadani 2016), so the volumetric oxygen transfer coefficient at temperature of water at T(…”

Section: Oxygen Transfer Parametersmentioning

confidence: 99%

“…The performance of a jet aeration system can be evaluated on the basis of standard oxygen transfer efficiency (Chipongo and Khiadani 2016) as where SOTE is standard oxygen transfer efficiency (kg/ kW h) and P is jet kinetic power (kW) estimated (Deswal and Verma 2007a) as where ρ is density of water (kg/m 3 ), Q is jet flow rate (m 3 /s), and V j is jet velocity (m/s)…”

Section: Oxygen Transfer Parametersmentioning

confidence: 99%

“…Deswal and Pal (2015) compared the performance of poly and RBF kernel function-based SVM in modeling mass transfer by vertical and inclined plunging jets. Chipongo and Khiadani (2016) studied oxygen transfer by multiple vertical plunging jets in tandem and observed the impact of various jet parameters on oxygen transfer. Jahromi and Khiadani (2017) have investigated the performance of nozzle jet discharging into turbulent cross-flow in a rectangular flume with varying jet impact angles, jet fall height, jet to cross-flow velocity ratio and depth of flow; and found substantially higher efficiency of nozzle jets in a cross-flow than the jets plunging into stagnant pool of water.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen transfer study and modeling of plunging hollow jets

2018

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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.

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