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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Radiative heat transfer in densely packed spherical particle system by Monte Carlo method

B. K. Liu
School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, China

Junming Zhao
School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, China

Linhua Liu
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; School of Energy and Power Engineering, Shandong University, Qingdao 266237, China

DOI: 10.1615/IHTC16.rti.024195
pages 8439-8446


Palavras-chave: Radiation, Porous media, Particle beds

Resumo

Particle beds or fluidized beds have important applications in engineering processes. At high temperature applications such as in fluidized beds combustion, thermal radiation will play a significant role in heat transfer. This work presents a Monte Carlo method to simulate the radiative heat transfer in densely packed particulate system of spherical particles. Each of the particles is considered as isothermal and the blocking effect among particles are fully considered in the Monte Carlo ray tracing algorithm. For optical large particles, geometrical optics is valid in dealing with thermal radiation, hence the ray tracing based algorithm is accurate in principle and can be applied to densely packed beds. The radiative heat transfer characteristics in system of randomly distributed spherical particles of different particle concentration were analyzed with the concept of the radiation distribution factor (RDF). A theoretical model of the RDF is proposed and verified. The RDF were obtained for systems of different filling ratio and particles with different surface emissivity. It is proved that the RDF generally follows a combination of the inverse square law and the exponential decay law with radial distance. This work will help the understanding of thermal radiation heat transfer in densely packed particulate system.

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