Search Results - "França, F.H.R."

On the individual importance of temperature and concentration fluctuations in the turbulence-radiation interaction in pool fires by Fraga, G.C., Centeno, F.R., Petry, A.P., Coelho, P.J., França, F.H.R.

“…•Turbulence-radiation interaction is studied for ethanol and methanol pool fires.•Large-eddy simulation is used to obtain detailed transient fields.•Individual…”
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Radiative transfer calculations in fire simulations: An assessment of different gray gas models using the software FDS by Fernandes, C.S., Fraga, G.C., França, F.H.R., Centeno, F.R.

“…The accuracy of the gray gas (GG) assumption for modeling the radiative transfer in fire simulations is studied for a closed compartment, an open environment,…”
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A wide-band based weighted-sum-of-gray-gases model for participating media: Application to H 2 O - CO 2 mixtures with or without soot by Fonseca, R.J.C. da, Fraga, G.C., Coelho, F.R., França, F.H.R.

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Two-way ANOVA analysis of novel ALBDF functions obtained for H2OCO2 gas mixtures considering variable mole fraction ratios in oxy− and air−fuel combustion conditions by Rodrigues, L.G.P., Coelho, F.R., Krummenauer, A., Nardelli, V.C., França, F.H.R.

“…•Mixture-based ALBDF functions generated for H2OCO2 mixtures applied with the RC-SLW.•1D test cases representative of oxy-fuel and air-fuel combustion are…”
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A wide-band based weighted-sum-of-gray-gases model for participating media: Application to H2O-CO2 mixtures with or without soot by Fonseca, R.J.C. da, Fraga, G.C., Coelho, F.R., França, F.H.R.

“…•A new approach for the WSGG model in which the spectrum is divided into bands and the gray gases coefficients of each interval are determined from emittance…”
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Application of absorption-line blackbody distribution functions for H2O-CO2 mixtures for the spectral integration of the radiative transfer equation with the SLW model by Rodrigues, L.G.P., Coelho, F.R., Centeno, F.R., França, F.H.R.

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Two-way ANOVA analysis of novel ALBDF functions obtained for H2O CO2 gas mixtures considering variable mole fraction ratios in oxy− and air−fuel combustion conditions by Rodrigues, L.G.P., Coelho, F.R., Krummenauer, A., Nardelli, V.C., França, F.H.R.

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Development and testing of a model for turbulence-radiation interaction effects on the radiative emission by Fraga, G.C., Coelho, P.J., Petry, A.P., França, F.H.R.

“…•A new model for turbulence-radiation interaction (TRI) is developed.•The development is based on transient data numerically generated for pool fires.•The…”
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Assessing individual time-averaged emission and absorption correlations for large-scale turbulent pool fires by Fraga, G.C., Coelho, P.J., França, F.H.R.

“…•Correlations related to the turbulence-radiation interaction phenomenon are studied.•The configurations under study are four turbulent pool fires.•The OTFA is…”
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Assessment of a model for emission subgrid-scale turbulence-radiation interaction applied to a scaled Sandia flame DD by Fraga, G.C., Miranda, F.C., França, F.H.R., Janicka, J., Coelho, P.J.

“…•A subgrid-scale (SGS) turbulence-radiation interaction model’s accuracy is assessed.•The configuration under study is a scaled version of the Sandia flame…”
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Grouping the wall spectral bands for an effective computation of the radiative transfer in participating media bounded by non-gray walls by da Fonseca, R.J.C., Fraga, G.C., França, F.H.R.

“…This study presents a methodology to solve the radiative transfer in participating media bounded by non-gray walls for direct use with global gas models. The…”
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Experimental study of jet fire radiation and a new approach for optimizing the weighted multi-point source model by inverse methods by Quezada, L.A., Pagot, P.R., França, F.H.R., Pereira, F.M.

“…The present study brings new experimental data on radiation from subsonic jet fires and proposes a new method for employing the inverse analysis technique to…”
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Evaluation of different gray gas formulations against line-by-line calculations in two- and three-dimensional configurations for participating media composed by CO2, H2O and soot by Fraga, G.C., Zannoni, L., Centeno, F.R., França, F.H.R.

“…This paper presents an assessment of the performance of different gray gas (GG) formulations in participating media composed by carbon dioxide, water vapor and…”
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Improvement of the weighted multi-point (WMP) radiation model for diffusive flames by the application of a set of stochastic optimisation algorithms by Silva, B.H., Pereira, F.M., Pagot, P.R., França, F.H.R.

“…The weighted multi-point source model (WMP) has been proposed to model flame radiation from far to near distances, encompassing regions where the single point…”
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A comprehensive evaluation of the WSGG model for air- and oxy-fuel combustion conditions through three-dimensional calculations by Fraga, G.C., Silva, F.R., Zanin, L.G.B., da Fonseca, R.J.C., França, F.H.R., Centeno, F.R.

“…This paper reports an assessment of the accuracy of most formulations of the weighted-sum-of-gray-gases (WSGG) model proposed in the last decade for the…”
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Evaluation and optimization-based modification of a model for the mean radiative emission in a turbulent non-reactive flow by Fraga, G.C., Centeno, F.R., Petry, A.P., França, F.H.R.

“…•Turbulence-radiation interaction is analyzed for a non-reactive problem.•Large-eddy simulation is used to obtain transient detailed fields.•A model developed…”
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Application of inverse analysis to correlate the parameters of the weighted-multi-point-source model to compute radiation from flames by Miguel, R.B., Machado, I.M., Pereira, F.M., Pagot, P.R., França, F.H.R.

“…•The WMP model permits a fast calculation of radiation from flames and jet fires.•The parameters of the model are determined from inverse analysis.•The input…”
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Investigation of the role of turbulent fluctuations on the time-averaged radiative emission in large-scale, turbulent pool fires by Fraga, G.C., Coelho, P.J., Petry, A.P., França, F.H.R.

“…This paper presents an analysis of turbulence-radiation interaction (TRI) effects on the radiative emission. Correlations and auto-correlations that arise from…”
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Inverse design of thermal systems with spectrally dependent emissivities by Hoffmann, R.S., Seewald, A., Schneider, P.S., França, F.H.R.

“…This work extends the inverse design methodology to systems in which the emissivities of the surfaces are dependent on the wavelength. The objective is to find…”
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Analysis of mixed convection in transient laminar and turbulent flows in driven cavities by dos Santos, E.D., Piccoli, G.L., França, F.H.R., Petry, A.P.

“…This work presents large eddy simulation of mixed convection in transient, two-dimensional laminar and turbulent flows in cavities. The Smagorinsky model is…”
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