Coupled radiation and natural convection: Different approaches of the slw model for a non-gray gas mixture

Colomer, G.; Cònsul, R.; Oliva, A.

doi:10.1016/j.jqsrt.2006.12.011

Cited by 33 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, in order to model the radiation one may use the radiation model "Surface to Surface" with a method of form factors. This model takes into account the radiative heat exchange between gray and Lambertian walls [17]. The natural convection flow coupled with radiation in a cavity is turbulent.…”

Section: Methodsmentioning

confidence: 99%

Temperature optimization of an electric heater by emissivity variation of heating elements

Hemmer¹,

Polidori²,

Popa³

2014

Case Studies in Thermal Engineering

View full text Add to dashboard Cite

a b s t r a c tThis note addresses an industrial application concerning the way to optimize the surface temperature of commercial electrical heater. The aim of this paper is to reduce the temperature on accessible surfaces and electrical heater in order to respect the European standards and quality criteria imposed by the manufacturer. This target must be achieved by changing only the emissivity distribution of the electric heater components. A numerical study of the natural convection flow coupled with radiation is carried out in a heated room with an electric heater. The physical model includes the transport equations of mass, momentum, energy and radiative transfer which are solved numerically. Thermo-physical properties of the fluid are assumed to be dependent of the temperature. The numerical simulations are carried out for a two-dimensional, steady and turbulent flow using the finite volume approach. Results showed the influence of emissivity distribution of the electric heater components. The reducing of the heating foil emissivity allowed to decrease the radiative contribution on the foil and its temperature.

show abstract

Section: Methodsmentioning

confidence: 99%

Temperature optimization of an electric heater by emissivity variation of heating elements

Hemmer¹,

Polidori²,

Popa³

2014

Case Studies in Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…Their radiation model was based on the P1 approximation and the weighted-sum-of-gray-gas model. Colomer et al [14] used different approaches of the spectral line weighted-sum-of-gray-gases (SLW) in order to consider the effect of non-gray radiative heat transfer in a participating medium (CO 2 , H 2 O, or CO 2 -H 2 O mixtures) on a thermal-driven cavity problem.…”

Section: Introductionmentioning

confidence: 99%

Interaction of radiation with double-diffusive natural convection in a three-dimensional cubic cavity filled with a non-gray gas mixture in cooperating cases

Cherifi

Laouar-Meftah

Benbrik

et al. 2015

Numerical Heat Transfer, Part A: Applications

View full text Add to dashboard Cite

A three-dimensional (3D) numerical study has been performed to investigate the effects of non-gray gas radiation on double-diffusive natural convection in a cubic enclosure filled with either air-H 2 O or air-CO 2 mixtures in cooperating situations. Gas radiation was taken into account by the discrete ordinates method (DOM) associated with the spectral line weighted-sum-ofgray-gases (SLW) spectral model. Results obtained for two average concentrations of H 2 O and CO 2 (10% and 20%) show that radiation modifies the temperature and concentration structures by creating oblique stratifications. The heat transfer rate is decreased, whereas mass transfer is not much modified. In addition, a comparison between 2D and 3D results is presented. ARTICLE HISTORY

show abstract

“…Recently, Sediki et al [15] considered a mixed laminar convection for homogeneous gas mixture. Colomer et al [16] studied the coupling of non-gray gas radiation and natural convection. Solovjov and Webb [8] presented an efficient method for modelling radiative transfer in multi-component gas mixture with soot as an extension of the SLW model.…”

Section: Introductionmentioning

confidence: 99%

Study of coupled double diffusive convection–radiation in a tilted cavity via a hybrid multi-relaxation time-lattice Boltzmann-finite difference and discrete ordinate methods

Moufekkir¹,

Moussaoui²,

Mezrhab³

et al. 2014

Heat Mass Transfer

View full text Add to dashboard Cite

The coupled double diffusive natural convection and radiation in a tilted and differentially heated square cavity containing a non-gray air-CO 2 (or air-H 2 O) mixtures was numerically investigated. The horizontal walls are insulated and impermeable and the vertical walls are maintained at different temperatures and concentrations. The hybrid lattice Boltzmann method with the multiple-relaxation time model is used to compute the hydrodynamics and the finite difference method to determine temperatures and concentrations. The discrete ordinates method combined to the spectral line-based weighted sum of gray gases model is used to compute the radiative term and its spectral aspect. The effects of the inclination angle on the flow, thermal and concentration fields are analyzed for both aiding and opposing cases. It was found that radiation gas modifies the structure of the velocity and thermal fields by generating inclined stratifications and promoting the instabilities in opposing flows. List of symbols a kWeighting factor in SLW model C Molecular concentration (mol m -3 )Absorption cross-sections (m 2 mol -1 ) DMass diffusivity (m 2 s -1 ) gGravitational acceleration (m s -2 ) I Radiation intensity (W m -2 sr -1 ) I 0 Black body radiation intensity (Wm -2 sr -1 ) kThermal conductivity (W m -1 K -1 ) L Enclosure width (m) M g

show abstract

Coupled radiation and natural convection: Different approaches of the slw model for a non-gray gas mixture

Cited by 33 publications

References 27 publications

Temperature optimization of an electric heater by emissivity variation of heating elements

Temperature optimization of an electric heater by emissivity variation of heating elements

Interaction of radiation with double-diffusive natural convection in a three-dimensional cubic cavity filled with a non-gray gas mixture in cooperating cases

Study of coupled double diffusive convection–radiation in a tilted cavity via a hybrid multi-relaxation time-lattice Boltzmann-finite difference and discrete ordinate methods

Contact Info

Product

Resources

About