NT & RP Journal
EVALUATION OF RADIATION HEAT TRANSFER IN POROUS MEDIA Application for a pebble bed modular reactor cooled by CO2 gas
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Vol. XXVIII, No. 2, Pp. 109-236
June 2013
UDC 621.039+614.876:504.06
ISSN 1451-3994

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Pages: 118-127

Kamel Sidi-Ali, Khaled Oukil, Tinhinane Hassani, Yasmina Amri, and Abdelmoumane Alem


This work analyses the contribution of radiation heat transfer in the cooling of a pebble bed modular reactor. The mathematical model, developed for a porous medium, is based on a set of equations applied to an annular geometry. Previous major works dealing with the subject have considered the forced convection mode and often did not take into account the radiation heat transfer. In this work, only free convection and radiation heat transfer are considered. This can occur during the removal of residual heat after shutdown or during an emergency situation. In order to derive the governing equations of radiation heat transfer, a steady-state in an isotropic and emissive porous medium (CO2) is considered. The obtained system of equations is written in a dimensionless form and then solved. In order to evaluate the effect of radiation heat transfer on the total heat removed, an analytical method for solving the system of equations is used. The results allow quantifying both radiation and free convection heat transfer. For the studied situation, they show that, in a pebble bed modular reactor, more than 70% of heat is removed by radiation heat transfer when (CO2) is used as the coolant gas.

Key words: heat transfer, porous medium, pebble bed modular reactor, radiation, free convection, gas, cooling, carbon dioxide


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