Modeling of a hollow-cone liquid spray including droplet collisions

Asheim, J. P.; Kirwan, John; Peters, James E.

doi:10.2514/3.23079

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…Further, it can be deduced that, Vo -Voo MVp m (29) Vs since the gain in gas phase volume is at the expense of the solid phase. The term V~ refers to the volume of one body (bubble or particle) from either the gas or solid phase.…”

Section: Effective Mass Transfermentioning

confidence: 99%

“…The Bischofberger and Schubert model was selected for this simulation since it can be conveniently applied to a population of particles and bubbles, making direct use of the simulation variables which have been calculated throughout the domain. The flotation collision model is applied to the simulation in a fashion analogous to how a drop collision and coalescence model was used for studying liquid sprays [29,30]. In the numerical simulation, the dispersed phases were modeled with their average diameters, so the collision rates from Eq.…”

Section: Dpb =Rp + Rbmentioning

confidence: 99%

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A hydrodynamic simulation of mineral flotation. Part I: the numerical model

Darcovich

1995

Powder Technology

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Mineral flotation is a process whereby particulates containing mineral bearing constituents preferentially adhere to gas bubbles in a liquid medium. This is a way to separate and upgrade ores or other mineral matter. In order to simulate this unit operation hydrodynamically, a three-phase system for the liquid phase and dispersed solids and bubbles must be employed. Additional simulation features are the cell geometry, the boundary conditions, drag terms, variable viscous effects, and the treatment of the adhesion of particles to bubbles. This paper, the first of a series of two, details the formulation of the governing equations, the numerical implementation and shows some results for a two-dimensional, incompressible case. The formulation and implementation are sufficiently general and this simulation was applied to the flotation of coal-oil agglomerates as detailed in Part II of this series.

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Section: Effective Mass Transfermentioning

confidence: 99%

Section: Dpb =Rp + Rbmentioning

confidence: 99%

A hydrodynamic simulation of mineral flotation. Part I: the numerical model

Darcovich

1995

Powder Technology

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“…Further, Asheim et al 32 incorporated a model to simulate dropdrop collision that forms breakup or coalescence. Consequently, their collision model observed velocities well however under predicted droplet' sizes and over predicted trajectory angles of droplets, despite whether droplets collisions were included or neglected.…”

mentioning

confidence: 99%

Numerical and experimental analysis on spray characteristics of biodiesel (waste cooking oil) using pressure swirl atomizer

Yadav

Gautam

2021

Environ Prog Sustainable Energy

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Atomization characteristics and evaporation have major role in air‐fuel mixing and the combustion process in diesel engine. The aim of this study is to perform numerical and experimental analysis to investigate the spray pattern of biodiesel (waste cooking oil) generated from pressure swirl atomizer. The computation exhibits Eularian‐Lagrangian method to comprise flow of multiphase and also linearized instability sheet atomization (LISA) model to envisage atomization, sheet breakup, and film formation. The model's strength is the identification structure of spray created from pressure swirl atomizer. A three‐dimensional computational fluid dynamics work consisting of LISA and Taylor analogy breakup model are certified via experimentation taken from constant volume chamber. Further, spray tip penetration, cone angle, and sauter mean diameter (SMD) are identified for fuel (B100, B25, and D) under injection pressure of 110 and 160 MPa, and 2.8 MPa ambient pressure using swirl atomizer in constant volume chamber. This particular spray is quite important for application in diesel engines but is not extensively explored. The results reveal that as injection pressure increases from 110 MPa to 160 MPa. The spray tip penetration for B100, B25, and D are increased by 19.86%, 14.90%, and 14.50% respectively, further, cone angle at the start of injection decreases by 6%, 5%, and 3.41%, similarly, the average SMD decreases by 25%, 33.33%, and 25.4%, respectively. This is due to the rheological property of fuel, turbulent energy of droplet and air is maximum in primary breakup zone.

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“…Theoretical calculations based on the Eulerian-Lagrangian formulism turn out to match well with the experimental results from PDPA measurements. Asheim et al [159] developed a model to simulate droplets stochastically and accounts for "drop-drop" effects by permitting droplet collisions that result in coalescence or breakup. Their collision model predicted droplet velocities very well but overpredicted droplet trajectory angles and underpredicted droplet sizes, regardless of whether collisions were neglected or included.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the turbulence motion of simple flows with nonswirling spray makes it possible for the standard k-Ɛ model to account for turbulence closure [158]. This turbulence model was reported to be capable of adequately describing hollow-cone sprays including droplet collisions [159].…”

mentioning

confidence: 98%

Numerical and experimental study on spray cooling system design for cooling performance enhancement of natural draft dry cooling towers

Sun¹

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The depletion of total fossil fuels and the concern about the pollution caused by the combustion process motivate people to find clean, and sustainable energy sources. The inexhaustible solar energy offers a clean and climate-friendly energy source. Concentrating solar power (CSP) is the main technology to transform solar energy into electricity. Since most CSP plants are built in arid regions with abundant solar irradiation but limited water resources due to the dry climate, natural draft dry cooling tower (NDDCT) is a good choice to remove waste heat from the power generation process.The small water consumption and easy operation make NDDCT quite attractive in CSP plants.However, power plants experience a significant reduction in power generation in summers due to the deteriorated performance of NDDCT during high ambient temperature periods. To overcome this problem, spray cooling technology is developed to precool the inlet air for thermal performance enhancement of NDDCT under hot weather conditions.With the advantage of simplicity, low capital cost, ease of operation and maintenance, spray cooling system has been developed for NDDCT to improve its cooling efficiency by utilizing the evaporative cooling effect of sprayed water droplets. Although some preliminary studies have been made on spray cooling, most of them are focusing on conceptual design. the design and test of spray cooling system

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Modeling of a hollow-cone liquid spray including droplet collisions

Cited by 10 publications

References 13 publications

A hydrodynamic simulation of mineral flotation. Part I: the numerical model

A hydrodynamic simulation of mineral flotation. Part I: the numerical model

Numerical and experimental analysis on spray characteristics of biodiesel (waste cooking oil) using pressure swirl atomizer

Numerical and experimental study on spray cooling system design for cooling performance enhancement of natural draft dry cooling towers

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