Analysis of collimated irradiation under local thermal non-equilibrium condition in a packed bed

作者：Wang, P.; Vafai, K.^*; Liu, D. Y.; Xu, C.

来源：International Journal of Heat and Mass Transfer, 2015, 80: 789-801.

DOI：10.1016/j.ijheatmasstransfer.2014.09.021

• Porous media
• Local thermal non-equilibrium
• Convective heat transfer
• Collimated irradiation
• Modified differential approximation (P-1)

Forced convective heat transfer in a packed bed in the presence of collimated irradiation and under local thermal non-equilibrium is analyzed in this work. Both the collimated and diffusive radiative transfer processes are accounted for using the modified P-1 approximation. Two boundary condition models considering different limiting conditions at the wall which couple radiation and convection under LTNE were constructed. The effect of pertinent parameters such as the porosity phi, pore diameter d(p), ratio of the solid to fluid thermal conductivities zeta: radiative properties including optical thickness tau, scattering albedo omega, and the wall emittance epsilon(w) were analyzed. Also, their effects on the temperature and heat flux distributions in the incident direction were analyzed systematically and the limiting interactions between thermal radiation and conduction were revealed. The differences between the two boundary models with the effects of the cited parameters were analyzed. Our analysis demonstrated that an increase in either phi or d(p) enhances the transfer of radiative energy into the channel.

• 出版日期2015-1
• 单位河海大学