Experimental investigation on behavior of multiple vertical buoyant jets discharged into a stagnant ambient

Lyu, Siwan; Seo, Il Won; Kim, Jae Won

doi:10.1007/s12205-013-0525-4

Cited by 12 publications

(14 citation statements)

References 11 publications

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“…This paper aims to study the accuracy of different turbulence models in predicting behavior of merging buoyant jets from multiport diffusers. For this purpose, experiments conducted by Lyu et al (2013) were numerically modeled. These experiments were performed in a rectangular tank, 6m in length, 1.2 m in width and 0.8 m in height.…”

Section: Methodsmentioning

confidence: 99%

“…Heated water was used in these experiments to represent the wastewater effluent from the diffusers. The experimental conditions that are used both by Lyu et al (2013) and in numerical simulation models during this study are presented in Table 1. Table1. Experimental Conditions used in numerical models (ambient depth, H = 0.7 m, port diameter, dp = 3 mm, Lyu et al 2013)Case Port spacing ( )…”

Section: Methodsmentioning

confidence: 99%

“…Such graphs for crosssectional profiles will diverge from Gaussian distribution during merging process which can be explained by the local flow properties starting to change during merging process. Lyu et al (2013) used best-fit curve in their experiments to derive the Gaussian constant (C) in Equation (1). With the jet characteristics shown in table 1, they derived C= 77.68.…”

Section: Symmetry Planementioning

confidence: 99%

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Numerical Modeling of Vertical Buoyant Jets discharged from multiport diffusers

Ghodoosipour¹,

Mohammadian²,

Nistor³

2016

International Symposium on Outfall Systems

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Multiport diffusers are widely used for marine wastewater discharges. In order to study the behavior of such jets after the discharge point, the numerical model OpenFOAM was used and two different RANS (Reynolds-Averaged Navier-Stokes) turbulence models namely − and LRR models were tested to simulate jets discharged from uni-directional multiport diffusers. Results from cross-sectional variation of mean axial velocity and longitudinal variation of axial velocity were compared to existing experimental results performed with similar jet properties. In general results from both models show good agreement between numerical and experimental data when simulating cross-sectional variation of mean axial velocity which is the direction that no merging happens; however, model was shown to work better in simulating the longitudinal variation of axial velocity which shows the fact that LRR is more successful in simulating jet behavior in the direction that merging happens.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Symmetry Planementioning

confidence: 99%

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Numerical Modeling of Vertical Buoyant Jets discharged from multiport diffusers

Ghodoosipour¹,

Mohammadian²,

Nistor³

2016

International Symposium on Outfall Systems

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“…If there are enough spacing and funds, a single discharge is the optimal configuration because the ambient water can be freely entrained into the jets, and thus the effluent is significantly diluted. However, the spacing and funds are often limited in practical engineering projects, so it is becoming a common practice to use diffusers with multiple ports [8,9]. Depending on how the ports are configured, a multiport diffuser can be classified into different types, such as unidirectional [9,10], Tee-shaped [11], and rosette-shaped [12,13].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Simulations of Buoyant Jets Discharged from a Rosette-Type Multiport Diffuser

Yan

Mohammadian

Chen

2019

JMSE

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In some outfall systems, wastewaters are discharged into ambient water bodies using rosette-type diffusers in the form of multiple buoyant jets, and it is essential to simulate their mixing characteristics for practical applications and optimal design purposes. The mixing processes of a rosette jet group are more complicated than single jets and multiple horizontal or vertical jets, and thus the existing methods cannot be effectively used to simulate their mixing and dilution properties. With the recent advancements in numerical modeling approaches, numerical simulation of wastewater jets as three-dimensional phenomena can be feasible. The present study deals with a fully three-dimensional numerical simulation for buoyant jets discharged from a rosette-type multiport diffuser, with the standard and re-normalization group (RNG) k-ε turbulence models. The simulated results are compared with experimental data, and the results show a good agreement with the experimental data, demonstrating that the numerical model is an efficient and effective tool for simulating rosette jet groups. It was also concluded that the RNG k-ε model leads to better results than the standard k-ε model with a comparable computational cost. The validated model was further utilized to investigate the influences of port inclinations on the mixing behaviors.

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“…As one type of free turbulent flow, jets discharged from various types of outfalls have been a long standing topic in hydraulics (Daily and Harleman 1966;Ferrari and Querzoli 2010;Lyu et al 2013). Since the pioneering work of Morton et al (1956) on the round buoyant jet, many theoretical, experimental and numerical studies have been performed on the characteristics of jets, such as trajectory, dilution, velocity profile, and turbulent intensities (Fischer 1979;List 1982;Papanicolaou and List 1988).…”

Section: Introductionmentioning

confidence: 99%

Multifractal characteristics of the jet turbulent intensity depending on the outfall nozzle geometry

Seo

Lyu

2015

Stoch Environ Res Risk Assess

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The multifractal measure enables an examination of the characteristics of a quantity distributed over a domain. This study examined the multifractal properties of turbulent intensities obtained from jet discharge experiments, where three types of nozzle geometries were examined in terms of the velocity fields and turbulent characteristics using particle image velocimetry. Depending on the nozzle geometry, the experimental results showed that the distribution of turbulent intensities and resulting dilution exhibited different behaviors. The experiment also showed that the transversal velocity profiles are similar to each other regardless of the outfall nozzle shapes and demonstrates the traditional similarity assumption at the same time. The multifractal exponents of the turbulent intensities were obtained with Box Count Method in a two-dimensional space. The results showed that the turbulent intensities obtained in two-dimensional space have a common multifractal spectrum, which was not the case for the velocity or shear stress observed in the same space. Although the transversal velocity profiles are similar, the multifractal exponent clearly shows a difference depending on the outfall geometries. In particular, the minimum value of the Lipschitz-Hölder exponent (a min ) and the entropy dimension (a 1 ) tends to increase as turbulent intensity and dilution increase. These results suggest that the multifractal properties can be utilized potentially to categorize and evaluate the discharge outfall capabilities in terms of the resulting dilution.

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Experimental investigation on behavior of multiple vertical buoyant jets discharged into a stagnant ambient

Cited by 12 publications

References 11 publications

Numerical Modeling of Vertical Buoyant Jets discharged from multiport diffusers

Numerical Modeling of Vertical Buoyant Jets discharged from multiport diffusers

Three-Dimensional Numerical Simulations of Buoyant Jets Discharged from a Rosette-Type Multiport Diffuser

Multifractal characteristics of the jet turbulent intensity depending on the outfall nozzle geometry

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