Numerical investigation of convective and radiative heat transfer in the entrance region of the elliptic duct with fins
Conference
Dong, ZF, Ebadian, MA. (1991). Numerical investigation of convective and radiative heat transfer in the entrance region of the elliptic duct with fins
. 77-84.
Dong, ZF, Ebadian, MA. (1991). Numerical investigation of convective and radiative heat transfer in the entrance region of the elliptic duct with fins
. 77-84.
This paper investigates combined laminar forced convection and radiation heat transfer of an absorbing-emitting gas in the entrance region of the elliptic duct with internal fins. The fins are continuous and longitudinal, with zero thickness. The thermal condition imposed on the elliptical duct is of uniform temperature, both axially and peripherally. The method of moments is employed to consider the radiation contribution, which models the radiation in the partial differential equation. The three-dimensional energy equation and two-dimensional irradiation equation are discretized and numerically solved by the control volume-based finite difference method in the boundary fitted coordinate system. The effect of six major parameters on thermal behavior in the entry region of the elliptic duct is discussed. These parameters are radiation-conduction, N; optical thickness, τb; wall emissivity, εw; Peclet number, Pe; fin height, H*; and the minor-axis to major-axis ratio of the elliptic duct, α*. The total Nusselt number variations show that heat transfer is enhanced by both thermal radiation and fins. Furthermore, the results are compared with the available data in the literature for pure forced convection with fins. It is proven in this paper that radiation plays a significant role in the enhancement of heat transfer.
