Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Development of a New Methodology to estimate the Emittance of Combustion Products using Spectral Data
Submission Author:
Pedro Wink Guaragna , RS
Co-Authors:
Pedro Wink Guaragna, Alexandre Huberto Balbino Selhorst, Guilherme Crivelli Fraga, Francis França
Presenter: Pedro Wink Guaragna
doi://10.26678/ABCM.ENCIT2020.CIT20-0392
Abstract
Combustion gases emit and absorb radiation in a wide range of temperatures; however, they do not do so continuously regarding the wavelength. The main references in literature contain charts for the emittance of carbon dioxide, water vapor and their mixtures that were produced more than fifty years ago. Using new spectral data from HITEMP-2010 and inserting them in a code in Fortran language, this work refreshes the charts available in literature. The values calculated of emittance differ in up to 10% for carbon dioxide and 25% for water vapor while compared to those presented by Hottel in 1954. It was possible to realize that the simplification proposed by Hottel of a variable “pressurelength” does not provide a good approximation for values of partial pressure lower than 0,2 atm. In this work a new methodology is presented, with which one can manage to attain acceptable error levels while in a wide range of lengths and partial pressures typical of combustion products.
Keywords
Radiative heat transfer, spectral dependence, gas emittance, Furnace design
DOWNLOAD PDF VIEW PRESENTATION
