MODELING OF RADIATIVE HEAT-TRANSFER IN ENCLOSURES WITH OBSTACLES

Radiation models suitable for incorporation in reactive fluid flow cod es are extended to calculate radiation in enclosures containing obstac les of very small thickness. The discrete transfer, the discrete ordin ates and the finite volume method are employed to predict the heat tra nsfer in two-dimensional enclosures and the results are compared with zone method calculations, with the total exchange areas determined by the Monte-Carlo method. All the methods predict similar heat fluxes, b ut the computational requirements are different. The discrete ordinate s and the finite volume method are the most economical ones. An applic ation to a utility boiler is also presented. (C) 1997 Elsevier Science Ltd.