Radiative-convective heat transfer in vertcal channels

Siva Thangam, Erol Cesmebasi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The convective stability of a radiating fluid between two infinitely long rigid vertical plates which are maintained at different isothermal temperatures is considered. The radiative transport is modeled using Eddington approximation including the weighted effect of nongrayness of the fluid. A linear stability analysis is performed wherein the disturbance equations are solved using a Galerkin procedure for both opaque and transparent boundaries. In the case of opaque boundaries, the steady motion is a function of the Planck number, optical thickness, plate emissivities and the weighted nongrayness of the fluid; and the radiative exchange between the plates tends to suppress the onset of buoyancy driven convective motion. When one boundary is made transparent, with the exclusion of the optically thin range, the added effect of the transmitted portion of the source radiation is found to considerably reduce the critical Rayleigh number and initiate overstable mode.

Original languageEnglish
Pages (from-to)95-101
Number of pages7
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume325
StatePublished - 1996

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