Szukana fraza: [Abstract = "The effect of thermal radiation and viscous dissipation on a combined free and forced convective flow in a vertical channel is investigated for a fully developed flow regime. Boussinesq and Roseseland approximations are considered in the modeling of the conduction radiation heat transfer with thermal boundary conditions \(isothermal\-thermal, isoflux\-thermal, and isothermal\-flux\). The coupled nonlinear governing equations are also solved analytically using the Differential Transform Method \(DTM\) and regular perturbation method \(PM\)."]