Benchmark Test Cases for Non-Gray Radiative Heat Transfer Calculation using FSK Look-Up Table

Abstract

Three test cases in the categories of homogeneous non-isothermal, non-homogeneous isothermal and non-homogeneous non-isothermal have been developed to validate the two-dimensional interpolation technique for calculation of non-gray radiative heat flux on the walls of the system. The participating gases H 2 O and CO 2 of different mole fractions and temperatures are considered in different zones of the test cases. HITEMP-2010 database has been used to calculate the absorption coefficients of H 2 O and CO 2 at different mole fractions and temperatures. Further, the random variation of absorption coefficients with spectrum has been reordered in smooth monotonically increasing smooth function using full spectrum k-distribution method (FSK). A look-up table is developed for different mole fractions and temperatures of gases H 2 O and CO 2. The calculation of absorption coefficients at thermodynamic states other than look up table has been performed using two dimensional interpolation techniques. The geometry of test cases have been divided into three zones whose conditions on the first and last zones are same as available in look-up table while interpolation is used for the middle zone. The radiative transfer equation is solved numerically by finite volume discrete ordinate method (FVDOM). The results have been compared with FSK method and have been found that interpolation techniques are giving satisfactory results with extremely less computational resource and time.

Estimation of thermal load on the nozzle base plate from small plumes at high temperature

“…Spectral line weight sum of gray gases [16] etc. The accuracy of the above methods is well demonstrated for uniform composition of gases [17,18], however, the variation in composition of gaseous and their mixture poses another level of challenge and further modelling is required [19]. In order to use look up The fvDOM numerical method is used for solution of RTE coupled with fluid flow using a pressure based compressible flow application sonicRadFoam, modified from sonicFoam application of OpenFOAM [20].…”