Combined convective-radiative heat transfer in a duct applying the modified differential approximation radiation model
Conference
Yang, G, Ebadian, MA. (1991). Combined convective-radiative heat transfer in a duct applying the modified differential approximation radiation model
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 160 45-53.
Yang, G, Ebadian, MA. (1991). Combined convective-radiative heat transfer in a duct applying the modified differential approximation radiation model
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 160 45-53.
In this paper, combined forced convective and radiative heat transfer with axial heat conduction and radiation in an arbitrary cross-section duct of absorbing, emitting and scattering media are analyzed. Modified differential approximation is employed to simplify the radiation transport equation. Combined heat transfer in a two-dimensional semi-infinite parallel plate duct is investigated as an example for this application. The solution is compared with the exact solution, as well as with the solution obtained by the standard method of moments radiation model. The results indicate that the present method predicted very good for combined heat transfer for both optically thick and thin media. The parameters studies reveal that combined heat transfer with the method of moments radiation model can result in a significant error for optically thin medium and also small Peclet number flow. The results also indicate that modified differential approximation is a suitable radiation model to deal with combined forced convection and radiative heat transfer in a general duct flow.
