A review: Aeration efficiency of hydraulic structures in diffusing DO in water

Puri, Diksha; Sihag, Parveen; Thakur, Mohindra Singh

doi:10.1016/j.mex.2023.102092

Cited by 5 publications

(4 citation statements)

References 71 publications

(70 reference statements)

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“…Several researchers have studied the oxygen diffusion between air and water caused by falling jets 24 . It was discovered that the impact angle had very little effect on the volumetric oxygen transfer coefficient 25 .…”

Section: Introductionmentioning

confidence: 99%

Performance analysis and modelling of circular jets aeration in an open channel using soft computing techniques

Puri,

Kumar,

Kumar

et al. 2024

Sci Rep

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Dissolved oxygen (DO) is an important parameter in assessing water quality. The reduction in DO concentration is the result of eutrophication, which degrades the quality of water. Aeration is the best way to enhance the DO concentration. In the current study, the aeration efficiency (E20) of various numbers of circular jets in an open channel was experimentally investigated for different channel angle of inclination (θ), discharge (Q), number of jets (Jn), Froude number (Fr), and hydraulic radius of each jet (HRJn). The statistical results show that jets from 8 to 64 significantly provide aeration in the open channel. The aeration efficiency and input parameters are modelled into a linear relationship. Additionally, utilizing WEKA software, three soft computing models for predicting aeration efficiency were created with Artificial Neural Network (ANN), M5P, and Random Forest (RF). Performance evaluation results and box plot have shown that ANN is the outperforming model with correlation coefficient (CC) = 0.9823, mean absolute error (MAE) = 0.0098, and root mean square error (RMSE) = 0.0123 during the testing stage. In order to assess the influence of different input factors on the E20 of jets, a sensitivity analysis was conducted using the most effective model, i.e., ANN. The sensitivity analysis results indicate that the angle of inclination is the most influential input variable in predicting E20, followed by discharge and the number of jets.

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Section: Introductionmentioning

confidence: 99%

Performance analysis and modelling of circular jets aeration in an open channel using soft computing techniques

Puri,

Kumar,

Kumar

et al. 2024

Sci Rep

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“…This point can vary greatly depending on the location, with places experiencing higher levels of turbulence more likely to see an earlier inception point at the surface. As the turbulence advances closer to the free surface, it also increases in intensity, creating large fluctuations in pressure, total kinetic energy, and other variables (Puri et al 2023). Also, when the surface of a body of water is disturbed enough to break up the surface tension, it creates a phenomenon called aeration.…”

Section: Introductionmentioning

confidence: 99%

The effect of the compound slope spillway on air entrainment and total kinetic energy using computational fluid dynamics

Jahad,

A. Alabas,

Mahmoud

et al. 2024

Water Practice &Amp; Technology

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The spillway is a hydraulic structure used for managing discharge, dissipating energy, and aeration purposes. The objective of this CFD analysis was to compare the ways in which water moved over various slanted spillways. Both the turbulence and the air–water interface were located using the volume of fluid (VOF) technique and a realizable k-model. Five different spillway models with varying slopes (normal = 30°, compound1 = 20° and 39°, and compound2 = 39° and 20°) were modelled and simulated in ANSYS Fluent. Computational data have been compared to the experimental results, and the findings were astonishing – the CFD model precisely captured the all-important flow facets. The numerical model pinpointed the inception point that occurred due to changes in slope and structure. In comparison to the normal slopes of (30°) and the compound slopes of (39°/20°), the surge in the location of the inception point was around 58%. The results of the research indicate a significant increase in turbulent kinetic energy as a result of the introduction of the compound slope. The study conducted has effectively achieved a crucial objective of the project, which is to enhance the operational efficiency and reliability of the spillway under diverse flow conditions.

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“…Nowadays, soft computing and multicriteria decision making techniques have generated significant interest in various fields of engineering including hydraulics and water resources. − Numerous research studies have documented the utilization of soft computing techniques in the field of aeration, highlighting their usefulness in this field. PSO, GA, and hybrid ANN algorithms with HHO models have been extensively employed for studying hydraulic formations, showcasing exceptional efficacy in simulating the scouring depth downstream of a spillway caused by ski-jump flows .…”

Section: Introductionmentioning

confidence: 99%

Analytical Investigation of the Impact of Jet Geometry on Aeration Effectiveness Using Soft Computing Techniques

Puri,

Kumar,

Sihag

et al. 2023

ACS Omega

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Jet aeration is a commonly used technique for introducing air into water during wastewater treatment. In this investigation, the efficacy of different soft computing models, namely, Random Forest, Reduced Error Pruning Tree, Artificial Neural Network (ANN), Gaussian Process, and Support Vector Machine, was examined in predicting the aeration efficiency (E 20 ) of circular and square jet configurations in an open channel flow. A total of 126 experimental data points were utilized to develop and validate these models. To assess the models' performance, three goodness-of-fit parameters were employed: correlation coefficient (CC), root-mean-square error (RMSE), and mean absolute error (MAE). The analysis revealed that all of the developed models exhibited predictive capabilities, with CC values surpassing 0.8. Nonetheless, when it comes to predicting E 20 , the ANN model outperformed other soft computing models, achieving a CC of 0.9748, MAE of 0.0164, and RMSE of 0.0211. A sensitivity analysis emphasized that the angle of inclination exerted the most significant influence on the aeration in an open channel. Furthermore, the results demonstrated that square jets delivered superior aeration compared to that of circular jets under identical operating conditions.

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A review: Aeration efficiency of hydraulic structures in diffusing DO in water

Cited by 5 publications

References 71 publications

Performance analysis and modelling of circular jets aeration in an open channel using soft computing techniques

Performance analysis and modelling of circular jets aeration in an open channel using soft computing techniques

The effect of the compound slope spillway on air entrainment and total kinetic energy using computational fluid dynamics

Analytical Investigation of the Impact of Jet Geometry on Aeration Effectiveness Using Soft Computing Techniques

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