Convective-radiative heat transfer in the thermal entrance region of semicircular duct with streamwise internal fins
Conference
Zhang, HY, Ebadian, MA. (1990). Convective-radiative heat transfer in the thermal entrance region of semicircular duct with streamwise internal fins
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 144 17-22.
Zhang, HY, Ebadian, MA. (1990). Convective-radiative heat transfer in the thermal entrance region of semicircular duct with streamwise internal fins
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 144 17-22.
In this paper, steady laminar forced convection and radiation heat transfer in the entrance region of an internally finned semicircular duct are analyzed. The fins are continuous and longitudinal, with zero thickness. The thermal conditions imposed on the semicircular duct is of uniform temperature, both axially and peripherally. The three dimensional energy equation is discretized and solved numerically by the Method of Lines (MOL). The Method of Momentum (MOM) is employed to consider the radiation contribution, which models the radiation in the partial differential equation, instead of the partial integro-differential equation. The resulting equations, based on coarse grids, are numerically computed, using a Runge-Kutta subroutine. The effect of five major parameters on the thermal behavior in the entry region of the semicircular duct is discussed: radiation-conduction, N; optical thickness, τb; wall emissivity, εw; fin number, M; and fin height to duct radius ratio, H. The variation of mean bulk temperature and total Nusselt numbers show that heat transfer enhances in this geometry by both thermal radiation and fins.
