Entropy generation for unsteady natural convection and thermal radiation inside a porous enclosure
by Abdesslem Jbara; Khalifa Slimi; Abdallah Mhimid
International Journal of Exergy (IJEX), Vol. 12, No. 4, 2013

Abstract: Entropy generation problem for unsteady natural convection and thermal radiation in a vertical porous enclosure, submitted to a uniform hot walls temperature and filled with a fluid saturated porous medium, has been performed. A time-space variations study is presented for fluid flow, heat transfer and radiative transfer irreversibilities, local entropy generation S_gen and modified Bejan number Be_m. A sensitivity study shows that Be_m increases, particularly near the boundaries, due to an increase in N or Br values and it decreases as τ_D or R values increase. For the cases of ε and ω, an inversion phenomenon is observed. Furthermore, S_gen and the total entropy generation E_gen values rise when there is an increase in ε, τ_D, R or Br values. In opposition, S_gen and E_gen values decrease with the increase of ω or N values.

Online publication date: Mon, 15-Jul-2013

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