Laminar forced convection radiation heat transfer in a square duct with a central elliptic core
Conference
Bigzadeh, E, Dong, ZF, Ebadian, MA. (1992). Laminar forced convection radiation heat transfer in a square duct with a central elliptic core
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 203 207-214.
Bigzadeh, E, Dong, ZF, Ebadian, MA. (1992). Laminar forced convection radiation heat transfer in a square duct with a central elliptic core
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 203 207-214.
Combined laminar forced convection and radiation heat transfer has been numerically investigated for a gray, absorbing, emitting, nonscattering gas in the entrance region of a square duct with a central, elliptic core. The thermal boundary conditions imposed on the square duct and the core are: a) a uniform temperature, both axially and peripherally, and b) constant heat flux on the surfaces of the square duct and in the elliptic core. The method of moments is applied to simulate the radiation contribution. The momentum, the three-dimensional energy, and the two-dimensional radiation equations are discretized and numerically solved by the control volume-based finite difference method in the boundary-fitted coordinate system. The effects of three major parameters influencing combined heat transfer, namely, the aspect ratio, α2, as well as the radiation-conduction parameter, N, and Optical thickness, τb are discussed in detail. The results for the total Nusselt number variation in the case of a uniform wall temperature indicate that heat transfer is enhanced by thermal radiation, whereas, in the case of constant wall heat flux, the effects of radiation are negligible. The predicted results for pure convection heat transfer by the present method are in good agreement with the available data published in open literature.
