An exact formulation of k-distribution methods in non-uniform gaseous media and its approximate treatment within the Multi-Spectral framework

摘要

Themainrestrictionofk-distributionapproachesforapplicationsinradiativeheattransferingaseousmediaarisesfromtheuseofascalingorcorrelationassumptiontotreatnon-uniformsituations.Itisshownthatthosecasescanbehandledexactlybyusingamultidimensionalk-distributionthataddressestheproblemofspectralcorrelationswithoutusinganysimplifyingassumptions.Nevertheless,theapproachcannotbesuggestedforengineeringapplicationsduetoitscomputationalcost.Accordingly,amoreefficientmethod,basedontheso-calledMulti-SpectralFramework,isproposedtoapproximatethepreviousexactformulation.ThemodelisassessedagainstreferenceLBLcalculationsandshowntooutperformusualk-distributionapproachesforradiativeheattransferinnon-uniformmedia...