Numerical Visualization of Plunging Water Jet using Volume of Fluid
                        Model

Boualouache, Amine; Zidouni, Faiza; Mataoui, Amina

doi:10.29252/jafm.11.01.27861

Cited by 6 publications

(4 citation statements)

References 25 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this purpose, computational fluid dynamics was used with Finite Volume Method (FVM) approach and Volume of Fluid (VOF) model. The accuracy and reliability of this model was investigated by Boualouache et al (2018) on the basis of three scale model validation by comparison with results of Chanson experiment (2004) and correlations for air entrainment rate proposed by Van de Donk (1981) and Biń (1993). Sanjay and Das (2017) also verified VOF model with satisfactory compliance using their experiment and simulation data.…”

Section: Introductionmentioning

confidence: 87%

“…In the other case, coherent jet that reaches the pool surface creates a plunging point. Boualouache et al (2018) mentioned an air boundary layer, which pulled down by interfacial shear also contributed to aeration process. Zhu et al (1999) emphasise specificity of critical Reynolds numbers for air entrainment in terms of their applicability to exact nozzle design that influences the surface disturbances which directly lead to bubble formation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chemical and Process Engineering

Jałowiecka

Makowski

2020

View full text Add to dashboard Cite

Every change in the bottle geometry as well as every change of physical and rheological properties poses a risk of excessive gas entrainment during a filling process. To maintain satisfactory filling efficiency there is a need to optimise this process with respect to all adverse phenomena which affect the fluid flow, such as spluttering on the bottom, air caverns formation and air entrainment with incoming liquid. This paper comprises numerical simulations of two filling methods. The first method involves dosing with a pipe placed over the free liquid surface of a fully filled bottle. The second method covers filling with a pipe located near the bottom. Moreover, the influence of rheological properties and surface tension values is considered. The comprehensive analysis of amount of entrained air represented by air volume fraction in dispensed liquid let the authors define the influence of filling speed on the mechanism and amount of entrapped air.

show abstract

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Chemical and Process Engineering

Jałowiecka

Makowski

2020

View full text Add to dashboard Cite

show abstract

“…A structured orthogonal mesh is used with a finer resolution for the area in which the water jet impacts the free surface down to a depth of 0.6 m. The smallest observed bubble size was 1 mm and the minimum cell size was 0.625 mm to increase the interface sharpness around the bubbles [13,46]. This mesh resolution is not fine enough to resolve the smallest bubbles present in the flow.…”

Section: (I) Numerical Set-upmentioning

confidence: 99%

Numerical validation of novel scaling laws for air entrainment in water

2021

View full text Add to dashboard Cite

The Froude scaling laws have been used to model a wide range of water flows at reduced size for almost a century. In such Froude scale models, significant scale effects for air–water flows (e.g. hydraulic jumps or wave breaking) are typically observed. This study introduces novel scaling laws, excluding scale effects in the modelling of air–water flows. This is achieved by deriving the conditions under which the governing equations are self-similar. The one-parameter Lie group of point-scaling transformations is applied to the Reynolds-averaged Navier–Stokes equations, including surface tension effects. The scaling relationships between variables are derived for the flow variables, fluid properties and initial and boundary conditions. Numerical simulations are conducted to validate the novel scaling laws for (i) a dam break flow interacting with an obstacle and (ii) a vertical plunging water jet. Results for flow variables, void fraction and turbulent kinetic energy are shown to be self-similar at different scales, i.e. they collapse in dimensionless form. Moreover, these results are compared with those obtained using the traditional Froude scaling laws, showing significant scale effects. The novel scaling laws are a more universal and flexible alternative with a genuine potential to improve laboratory modelling of air–water flows.

show abstract

“…Since the volume fraction, α, is a property of the fluid, which changes along with the fluid, thus, its evolution is dictated by the simple advection relation, expressed as [34]:…”

Section: Numerical Schemementioning

confidence: 99%

Volume of Fluid Computations of Gas Entrainment and Void Fraction for Plunging Liquid Jets to Aerate Wastewater

Bahadar

2020

ChemEngineering

View full text Add to dashboard Cite

Among various mechanisms for enhancing the interfacial area between gases and liquids, a vertical liquid jet striking a still liquid is considered an effective method. This method has vast industrial and environmental applications, where a significant application of this method is to aerate industrial effluents and wastewater treatment. Despite the huge interest and experimental and numerical efforts made by the academic and scientific community in this topic, there is still a need of further study to realize improved theoretical and computational schemes to narrow the gap between the measured and the computed entrained air. The present study is a numerical attempt to highlight the air being entrained by water jet when it intrudes into a still water surface in a tank by the application of a Volume of Fluid (VOF) scheme. The VOF scheme, along with a piecewise linear interface construction (PLIC) algorithm, is useful to follow the interface of the air and water bubbly plume and thus can provide an estimate of the volume fraction for the gas and the liquid. Dimensionless scaling derived from the Fronde number and Reynolds number along with geometric similarities due to the liquid jet’s length and nozzle diameter have been incorporated to validate the experimental data on air entrainment, penetration and void fraction. The VOF simulations for void fraction and air-water mixing and air jet’s penetration into the water were found more comparable to the measured values than those obtained using empirical and Euler-Euler methods. Although, small overestimates of air entrainment rate compared to the experiments have been found, however, VOF was found effective in reducing the gap between measurements and simulations.

show abstract

Numerical Visualization of Plunging Water Jet using Volume of Fluid Model

Cited by 6 publications

References 25 publications

Chemical and Process Engineering

Chemical and Process Engineering

Numerical validation of novel scaling laws for air entrainment in water

Volume of Fluid Computations of Gas Entrainment and Void Fraction for Plunging Liquid Jets to Aerate Wastewater

Contact Info

Product

Resources

About