Convective-radiative heat transfer to a solid pipe confined within a square duct
Conference
Bigzadeh, E, Dong, ZF, Ebadian, MA. (1991). Convective-radiative heat transfer to a solid pipe confined within a square duct
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 168 69-76.
Bigzadeh, E, Dong, ZF, Ebadian, MA. (1991). Convective-radiative heat transfer to a solid pipe confined within a square duct
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 168 69-76.
Combined laminar forced convection and radiation heat transfer have been numerically investigated for a gray, absorbing, emitting, nonscattering gas in the entrance region of a square duct with a centered, circular core. The thermal condition imposed on the square duct and the core is a uniform temperature, both axially and peripherally. The method of moments is applied to consider the radiation contribution. The momentum equation, the three-dimensional energy equation and the two-dimensional irradiation equation are discretized and numerically solved by the control volume-based finite difference method in the boundary-fitted coordinate system. This numerical scheme is found to be simple, accurate and efficient, and it is especially suited for combined heat transfer. The effects of four major parameters influencing combined heat transfer, namely the aspect ratio, α*, as well as radiation-conduction, N, optical thickness τb and wall emissivity, εw are discussed in detail. The results for total Nusselt number variations indicate that heat transfer is enhanced by thermal radiation. The predicted results for pure convective heat transfer are in good agreement with available data published in open literature.
