NUMERICAL-ANALYSIS OF THE EFFECT OF RADIA TION ON STEADY LAMINAR NATURAL-CONVECTION IN 2-DIMENSIONAL PARTICIPATING MEDIUM BETWEEN HORIZONTAL CONCENTRIC OR VERTICALLY ECCENTRIC CYLINDERS

Combined radiation and natural convection in a participating medium be tween concentric or vertically eccentric horizontal cylinders is inves tigated numerically. The annular medium is considered as a gray, emitt ing, absorbing, and isotropically scattering gas. The equations of ste ady, laminar, two-dimensional, thermal, natural convection are written by using a two-cylindrical coordinate system, the stream function, an d the vorticity. The finite volumes method is used to discretize the c oupled equations of momentum, energy, and radiative transfer. To solve the global nonlinear algebraic equations the successive-over-relaxati on iterating scheme is applied. Numerical solutions are obtained for a Rayleigh number in the range 10(3)-10(5) and radiation-conduction par ameter ranging from 0 to infinity. The influences of radiation-conduct ion parameter, Rayleigh number and other parameters on flow and temper ature distributions and heat transfer are discussed. (C) Elsevier, Par is.