Assessment of Nongray Gas Models for Radiative Properties of High Temperature Water Vapor

Abstract

Radiative Properties of high temperature water vapor play an important role for radiative heat transfer analysis in combustion engineering, fire safety science, etc. Absorption spectrum of visible to infrared light inherently depends on the wavelength of electromagnetic waves. Ignoring the spectral dependence makes radiative heat transfer analyses wrong results. To overcome the problem, various nongray gas models have been proposed. However, there are a few studies for summarizing these characteristics in prediction. The goal of this study is to give valuable information for engineering applications. In the present study, radiative properties and simulation characteristics of high-temperature water vapor using the Planck-mean approximation, the statistical narrow band model, and the full-spectrum k-distribution model are assessed rigorously by comparing with the Line-by-Line method. The recent HITRAN/HITEMP databases are employed to calculate Line-by-Line spectrum.