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Radiation heat transfer in a complex geometry containing anisotropically-scattering mie particles

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posted on 2019-01-01, 00:00 authored by A Ettaleb, M A Abbassi, H Farhat, K Guedri, A Omri, M N Borjini, M Goodarzi, Mohsen Sarafraz
This study aims to numerically investigate the radiation heat transfer in a complex, 3-D biomass pyrolysis reactor which is consisted of two pyrolysis chambers and a heat recuperator. The medium assumes to be gray, absorbs, emits, and Mie-anisotropically scatters the radiation energy. The finite volume method (FVM) is applied to solve the radiation transfer equation (RTE) using the step scheme. To treat the complex geometry, the blocked-off-region procedure is employed. Mie equations (ME) are applied to evaluate the scattering phase function and analyze the angular distribution of the anisotropically scattered radiation by particles. In this study, three different states are considered to test the anisotropic scattering impacts on the temperature and radiation heat flux distribution. These states are as: (i) Isotropic scattering, (ii) forward and backward scattering and (iii) scattering with solid particles of different coals and fly ash. The outcomes demonstrate that the radiation heat flux enhances by an increment of the albedo and absorption coefficients for the coals and fly ash, unlike the isotropic case and the forward and backward scattering functions. Moreover, the particle size parameter does not have an important influence on the radiation heat flux, when the medium is thin optical. Its effect is more noticeable for higher extinction coefficients.

History

Journal

Energies

Volume

12

Issue

20

Article number

3986

Pagination

1 - 22

Publisher

MDPI

Location

Basel, Switzerland

eISSN

1996-1073

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

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