Effects of mixed boundary conditions on conjugated heat transfer in a concentric annulus
Conference
MacGrath, D, Yang, G, Ebadian, MA. (1991). Effects of mixed boundary conditions on conjugated heat transfer in a concentric annulus
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 190 31-41.
MacGrath, D, Yang, G, Ebadian, MA. (1991). Effects of mixed boundary conditions on conjugated heat transfer in a concentric annulus
. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 190 31-41.
This paper numerically examines the influence of combined convection and radiation heat transfer in the entrance region of a concentric annular duct. Four kinds of fundamental boundary conditions on the combined convective and radiative Nusselt number under varying radial aspect ratios are analyzed. The radiative contribution has been modeled by the method of moments. By applying the method of lines (MOL) to discretize the nonlinear partial differential equation, the energy and radiation transport equation is reduced to a set of ordinary differential equations. The IMSL fifth-order Runge-Kutta-Verner method is further applied to compute temperature distribution in the thermal entrance region of the annulus. The effects of mixed boundary conditions at the two walls, the radial aspect ratio, and the heat generation rate are presented and discussed. The results indicate that radiation can considerably change the characteristics of thermal behavior and temperature distribution in the entry region of the annular duct. Furthermore, the results compare very well with the available data published in open literature for the pure convective heat transfer case.
