Analysis of radiative heat transfer in complex two-dimensional enclosures with obstacles using the modified discrete ordinates method

In this work, an extension of a modified discrete ordinates method recently proposed by other researchers is presented. It is intended to counter the ray effect inherent in this method, The media analyzed are absorbing, emitt ing and isotropically or anisotropically scattering and the enclosure geome try is arbitrary. Cases with obstructions are emphasized. The radiative int ensity is broken into two parts: the wall-related intensity v and the mediu m-related intensity. The former is treated separately by rigorous integrati on over the entire solid boundary. A new differencing scheme based on quadr angular grids is also proposed and used for the treatment of the medium-rel ated intensity. Results confirm that the proposed method is a good general remedy for anomalies caused by the ray effect due to the geometry.