Radiation Heat Transfer in a Complex Geometry Containing Anisotropically-Scattering Mie Particles
| Autor: | Mohammad Mohsen Sarafraz, Ali Ettaleb, Kamel Guedri, Marjan Goodarzi, Ahmed Omri, Habib Farhat, Mohamed Ammar Abbassi, Mohamed Naceur Borjini |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Control and Optimization
Materials science 020209 energy Energy Engineering and Power Technology 02 engineering and technology Radiation lcsh:Technology mie particles Complex geometry 0203 mechanical engineering heat recuperation 0202 electrical engineering electronic engineering information engineering Recuperator Electrical and Electronic Engineering Engineering (miscellaneous) Finite volume method lcsh:T Renewable Energy Sustainability and the Environment Scattering Isotropy Radiant energy blocked-off-region procedure anisotropic scattering Computational physics radiation 020303 mechanical engineering & transports Heat transfer Energy (miscellaneous) |
| Zdroj: | Energies Volume 12 Issue 20 Energies, Vol 12, Iss 20, p 3986 (2019) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en12203986 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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