Parametric Analysis of the Effective Thermal Conductivity of Radiation-thermal Conductivity Coupling Heat Transfer in the Particle Packing Bed
Particle packing beds have important applications in industrial production such as high temperature gas-cooled reactors.For the safety analysis of passive cooling of particle bed nuclear reactors under accidents,thermal radiation is the most important heat transfer mechanism.In this paper,the effective thermal conductivity,which characterizes the heat transfer properties of the coupled radiation-thermal conductivity heat transfer process in a particle stacked bed,is studied by using the inverse discrete coordinate ray tracing method combined with the finite volume method to solve for the coupled thermal radiation-thermal conductivity heat transfer in a particle bed,so as to obtain the equivalent thermal conductivity.Comparison with semi-empirical models and analysis of the effect of particle diameter,particle thermal conductivity and emissivity on the effective thermal conductivity.The results show that the long-short range model can better predict the equivalent thermal conductivity of the particle bed compared to other models,and the equivalent thermal conductivity of the particle bed increases significantly with increasing particle diameter,particle thermal conductivity and emissivity.The results of the study help to understand the role of radiative heat transfer in particle packing beds and provide reference for the analysis of heat transfer in particle packing beds.
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