Numerical Simulation of Actual Delivered Density of Sprinkler Spray Through Fire Plumes

Nam, Soonil

doi:10.1615/atomizspr.v4.i4.20

Cited by 9 publications

(7 citation statements)

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“…Designing the ADD setup with burners poses challenges and previous studies [19,20] have avoided direct simulation of the ADD burners. Radiation from the burner fires may also affect the ceiling flows, although in the present study radiative heating of the ceiling or the sprinkler links are not considered.…”

Section: Computational Burner Setupmentioning

confidence: 99%

“…As in previous studies [19,20], a volumetric plume source has also been applied to compare its performance against the designed burner results forQ c = 1500 kW. However, unlike the use of a cylindrical volumetric source as in Ref.…”

Section: Volumetric Plume Sourcementioning

confidence: 99%

“…For good estimation of ceiling layer flows, accurate modeling of fire plumes is of importance. In order to simulate rack-storage fire plumes, Bill [19] and Nam [20] have modeled the ADD plume generator with the application of volumetric sources of HRR. The volumetric source size and spatial location were adjusted by trial and error so that the simulated plume temperature and velocity distributions matched the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulations of Strong-Plume Driven Ceiling Flows

Chatterjee¹,

Meredith²,

Ditch³

et al. 2014

Fire Saf. Sci.

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Large eddy simulations (LES) of ceiling flow driven by strong-plumes of rack-storage fires have been simulated for a range of convective heat release rates (HRR) and ceiling heights. An actual delivered density (ADD) apparatus plume generator burner setup has been modeled using buoyant diffusion flames and with the inclusion of an upstream airflow vent producing the higher plume velocities observed in rack-storage fires. Computed results for plume centerline excess temperature and velocity have been compared against experimental data. In addition to the modeled burner setup, an alternate volumetric HRR source has also been applied in the simulations. Flows under ceilings located at different heights above the ADD apparatus have been simulated. Various convective HRR plumes have been used and the resulting ceiling flow radial distributions of computed excess temperature and velocity have been compared against experimental measurements. Predicted temperature and radial velocity profiles have also been shown to agree favorably with experimental data at two depths below the ceiling heights. Comparison of ceiling layer depths have also shown good comparison with an empirical correlation.

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Section: Computational Burner Setupmentioning

confidence: 99%

Section: Volumetric Plume Sourcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulations of Strong-Plume Driven Ceiling Flows

Chatterjee¹,

Meredith²,

Ditch³

et al. 2014

Fire Saf. Sci.

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“…However, with the advent of the Fire Dynamics Simulator (FDS) first released in 2000 [1], modeling of fire phenomena with computational fluid dynamics (CFD) tools is becoming increasingly popular. Some early computational studies [2][3][4][5][6][7] focused on studying the interaction between fire plumes and sprinkler sprays; however, without detailed knowledge of initial spray characteristics, dispersion predictions, typically quantified through analysis of volume flux to the floor, are not very satisfying.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive methodology for characterizing sprinkler sprays

Ren

Baum

Marshall

2011

Proceedings of the Combustion Institute

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“…Recently, computational fluid dynamics (CFD) models have been developed that combine droplet spray computations with numerical solutions to the Navier-Stokes equations for the plume flow. Nam [8,9] developed a model to simulate a fire sprinkler spray interacting with a fire plume using a Eulerian approach for the gaseous phase and a Lagrangian particle tracking method for the droplet spray. The results from this model show a well-defined boundary between the downward moving air entrained by the sprinkler droplets and the upward moving thermal plume, referred to as the 'interaction region.'…”

Section: Introductionmentioning

confidence: 99%

A Simplified Model of the Effect of a Fire Sprinkler Spray on a Buoyant Fire Plume

Schwille¹,

Lueptow²

2006

Journal of Fire Protection Engineering

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Equations describing the fluid motion in buoyant plumes have been applied to fire plumes by researchers and engineers since Morton et al. developed them in the 1950s. However, in the application of active fire suppression by water droplets, the equations are no longer valid. The equations have been modified to include the effect of a homogeneous, uniform velocity droplet field on the momentum of the fluid. Solving the resulting ordinary differential equations shows that the plume widens and the upward velocity of the plume slows significantly due to the presence of droplets. Results from this simple model appear to match the results of more sophisticated numerical simulations. The model further demonstrates that the interaction between the upward momentum of the plume and the downward momentum of the droplet spray can be critical for fire suppression.

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Numerical Simulation of Actual Delivered Density of Sprinkler Spray Through Fire Plumes

Cited by 9 publications

References 0 publications

Numerical Simulations of Strong-Plume Driven Ceiling Flows

Numerical Simulations of Strong-Plume Driven Ceiling Flows

A comprehensive methodology for characterizing sprinkler sprays

A Simplified Model of the Effect of a Fire Sprinkler Spray on a Buoyant Fire Plume

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