Simultaneous radiation and forced convection in absorbing, emitting gas flow of semi-circular and right triangular ducts with constant wall temperature
Conference
Yang, G, Ebadian, MA. (1990). Simultaneous radiation and forced convection in absorbing, emitting gas flow of semi-circular and right triangular ducts with constant wall temperature
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 137 165-172.
Yang, G, Ebadian, MA. (1990). Simultaneous radiation and forced convection in absorbing, emitting gas flow of semi-circular and right triangular ducts with constant wall temperature
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 137 165-172.
In this paper, the interaction of radiation and forced convection in simultaneously developing steady laminar flow through isothermal, semi-circular and right triangular ducts with non-black wall is investigated. The three dimensional momentum and energy equations are discretized and solved numerically by the method of lines. The method of momentum is employed to consider the radiation contribution, which models the radiation in the partial differential equation, instead of the partial integrodifferential equation. The resulting equations based on coarse grids, are computed numerically using the Runge-Kutta subroutine. The effect of three major parameters, radiation-conduction parameter, N, optical thickness, τb, and wall emissivity, ε, on the thermal behavior in the entry region of these irregular ducts are discussed. The numerical results in terms of variation of bulk temperature and mean Nusselt numbers show that the thermal radiation not only increases the heat transfer rate, but also changes the characteristics of convective heat transfer. Furthermore, the results compare very well with the available data published in open literature for the pure convective case.
