Radiative heat transfer in strongly forward scattering media of circulating fluidized bed combustors

Ates, Cihan; Ozen, Guzide; Selçuk, Nevín; Kulah, Gorkem

doi:10.1016/j.jqsrt.2016.06.009

Cited by 23 publications

(3 citation statements)

References 38 publications

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“…Meanwhile, the importance of thermal radiation transfer in industrial fluidized beds increases gradually with increasing temperature. Some studies have shown that the radiative heat transfer coefficient accounts for about 25-50% of the total heat transfer coefficient in industrial circulating fluidized bed boilers [11], therefore, the thermal radiation transfer is an important part of two-phase thermal transfer [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical simulations of compound heat transfer in an internally circulating fluidized bed

Wang

Sun

et al. 2021

Heat Mass Transfer

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In this paper, the compound heat transfer of convection and radiation in an internal circulating fluidized bed for low temperature oxidation of pulverized coal was numerically simulated. The numerical prediction about the compound heat transfer characteristics and its relationship of convection and radiation was compared with the experimental measurements of low temperature radiation. The discrete ordinate model (DOM) was employed to investigate the radiation heat transfer in the low temperature oxidation internally fluidized bed, and user-defined function (UDF) was compiled by considering the effect of the particle flow emissivity on radiation heat transfer. The convection heat transfer coefficient increases with the increase of gas inlet volume flow rate and initial bed material height, however, thermal radiation coefficient was opposite. An increase of the thermal flux results in an increase of the surface temperature of the fluid and the heater surface, and the thermal transfer coefficient between bed material and heater surface is also increased. The results have the application reference to complex thermal transfer design of circulating fluidized bed systems wherein thermal radiation transfer must be considered as a significant mode.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical simulations of compound heat transfer in an internally circulating fluidized bed

Wang

Sun

et al. 2021

Heat Mass Transfer

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“…Although the spectral thermal radiation of the particulate phase (e.g. solid particles and droplets) has been shown to be important in combustion applications [13,20,21], solving RTE for particles is mostly done by gray medium assumption [22,23]. In one of the first attempts to use the global models in solving the thermal radiation within the multiphase flows, Wang et.…”

Section: Introductionmentioning

confidence: 99%

Development of full spectrum correlated k-model for spectral radiation penetration within liquid fuels

Alinejad

Bordbar

Hostikka

2020

International Journal of Heat and Mass Transfer

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“…Radiation heat transfer plays a dominant role in hightemperature systems, such as furnace, [1][2][3] fluidized bed, [4,5] flames, [6][7][8][9][10] combustion diagnostics. [11][12][13] Radiative energy exchange between the participating medium and the wall surface is the most important information for thermal design of these systems.…”

Section: Introductionmentioning

confidence: 99%

Calculation of radiative heat flux on irregular boundaries in participating media*

Sun¹,

Zheng²

2020

Chinese Phys. B

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Radiative heat flux at wall boundaries is important for its thermal design. Numerical methods based on structured grids are becoming trendy due to their simplicity and efficiency. Existing radiative transfer equation solvers produce oscillating radiative heat flux at the irregular boundary if they are based on structured grids. Reverse Monte Carlo method and analytical discrete ordinates method are adopted to calculate the radiative heat flux at complex boundaries. The results show that the reverse Monte Carlo method can generate a smooth radiative heat flux profile and it is smoother with larger energy bundles. The results from the analytical discrete ordinates method show that the fluctuations are due to the ray effect. For the total or the mean radiative heat flux, the results from the analytical discrete ordinates method are very close to those from the reverse Monte Carlo method.

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Radiative heat transfer in strongly forward scattering media of circulating fluidized bed combustors

Cited by 23 publications

References 38 publications

Experimental and numerical simulations of compound heat transfer in an internally circulating fluidized bed

Experimental and numerical simulations of compound heat transfer in an internally circulating fluidized bed

Development of full spectrum correlated k-model for spectral radiation penetration within liquid fuels

Calculation of radiative heat flux on irregular boundaries in participating media*

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