CALCULATION OF RADIATIVE TRANSFER IN NONGRAY GAS USING 
A NARROW-BAND MODEL AND MONTE CARLO SIMULATION

M. Cherkaoui , M. Asbik , and A. Khmou

UDC 621.039.51

Radiation transfer is treated by the application of 
a narrow-band statistical model (NBSM) that takes emission and absorption 
gas spectral structures into account. A Monte Carlo method (MCM) using 
a net exchange technique was developed to integrate the radiative-transfer 
equation in nongray gas. The proposed procedure is based on a net-exchange 
formulation (NEF). This formulation provides an efficient way of systematically 
fulfilling the reciprocity principle, which avoids some of the major 
problems usually associated with the Monte Carlo method; the numerical 
efficiency becomes independent of the optical thickness, highly nonuniform 
grid sizes can be used with no increase in computation time, and configurations 
with small temperature differences can be treated with very good accuracy. 
It is shown that the radiative term is significant compared to the 
conductive term in just two specific regions in the emitting and absorbing 
gas in the immediate vicinity of the wall and in the external part 
of the boundary layer. The exchange Monte Carlo method (EMCM) is described 
in detail for a one-dimensional slab.

JEPTER74920199914
JEPTER7492014