WSGG Model Correlations to Compute Nongray Radiation From Carbon Monoxide in Combustion Applications

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Rogério Brittes ◽  
Felipe Roman Centeno ◽  
Aline Ziemniczak ◽  
Francis. H. R. França
Keyword(s):  
Carbon Monoxide ◽  
Total Pressure ◽  
Test Cases ◽  
Weighted Sum ◽  
Path Lengths ◽  
Nonisothermal Conditions ◽  
Wsgg Model

This paper presents correlations for the weighted-sum-of-gray-gases (WSGG) model for carbon monoxide based on HITEMP2010. The correlations are valid for pressure path lengths from 0.0001 atm·m up to 10 atm·m, total pressure in the order of 1.0 atm, and for temperatures ranging from 400 K up to 2500 K. Some test cases embodying nonhomogeneous, nonisothermal conditions are presented, and the results for the WSGG model are compared with the line-by-line (LBL) solutions for CO.

ACTION OF HIGH SPEED ELECTRONS ON METHANE, OXYGEN AND CARBON MONOXIDE

1930 ◽  
Vol 3 (3) ◽  
pp. 241-251 ◽  
Author(s):  
J. C. McLennan F.R.S. ◽  
J. V. S. Glass B.A.
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Water Vapor ◽  
Formic Acid ◽  
Total Pressure ◽  
High Speed ◽  
Reaction Rate ◽  
First Order ◽  
Gaseous Products ◽  
Retarding Effect

This paper deals with the action of cathode rays on gases and gas mixtures. Methane, methane-oxygen mixtures, carbon monoxide and carbon monoxide-oxygen mixtures were examined. Methane gave small percentages of hydrogen and ethane. Methane and oxygen mixtures gave as gaseous products, carbon monoxide, carbon dioxide and hydrogen, the only other products being water and formic acid. The relative proportions of the products do not vary widely under a wide variation of conditions.The reaction was found to be of the first order with respect to pressure. The reaction rate increases linearly with the voltage up to a certain value, after which it becomes nearly independent of the voltage.The action of cathode rays on carbon monoxide produces carbon dioxide and a solid brown suboxide which is extremely soluble in water, and its composition corresponds to a formula (C3O)n. If the carbon monoxide is moist, no visible amount of solid or liquid is found and there is less carbon dioxide.Carbon monoxide-oxygen mixtures under the action of cathode rays form carbon dioxide. Presence of water vapor has a retarding effect on the reaction. For mixtures of the same composition the reaction rate is proportional to the total pressure. For dry mixtures the product increases with the carbon monoxide present; when moist it is much less, and independent of the carbon monoxide.

CO2 Laser-induced and BCl3-sensitized decomposition of hexafluoroacetone. Comparison with high temperature thermochemistry

1982 ◽  
Vol 47 (3) ◽  
pp. 912-917
Author(s):  
Josef Pola ◽  
Pavel Engst ◽  
Milan Horák
Keyword(s):  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
High Temperature ◽  
Co2 Laser ◽  
Carbonyl Compounds ◽  
Total Pressure ◽  
Tungsten Filament ◽  
Reaction Progress ◽  
Induced Decomposition ◽  
Carbonyl Fluoride

The cw CO2laser-induced decomposition of hexafluoroacetone sensitized with boron trichloride (total pressure 5.3-8.0 kPa) yields along with perfluorinated hydrocarbons trifluoroacetyl fluoride, carbon monoxide and carbonyl fluoride. The same carbonyl compounds are also formed by conventional thermal decomposition of hexafluoroacetone on tungsten filament at temperatures 950-2 100°C but their distribution during reaction progress is different. Features of both reactions are discussed.

Evaluating the Ability of SLW Model in Numerical Simulation of Radiative Turbulent Reacting Flow in Industrial Application

2018 ◽  
Author(s):  
Masoud Darbandi ◽  
Mohammad Bagher Barezban ◽  
Gerry E. Schneider
Keyword(s):  
Absorption Coefficient ◽  
Radiation Absorption ◽  
Discrete Ordinates ◽  
Reacting Flow ◽  
Temperature Sensitive ◽  
Weighted Sum ◽  
Combustion Gases ◽  
Temperature Filed ◽  
Turbulent Closure ◽  
Wsgg Model

In this paper, the turbulent reacting flow in an industrial furnace is numerically simulated using the RANS equations. The two-equation standard k-ε and the eddy dissipation models are used respectively to close the turbulent closure problem and to consider the turbulence-chemistry interaction. The radiation transfer equation is solved using the discrete ordinates method (DOM). To calculate the radiation absorption coefficient in participating combustion gases, we use the spectral line-based weighted sum of grey gases (SLW) model and compare the achieved results with famous gray-based model, i.e., the weighted-sum-of-gray-gases (WSGG) model. The results of this research show that using the SLW model, the predicted heat transfer from the flame to the furnace walls is reduced due to the thermal radiation. So, the predicted temperature filed increases up to 5% near the outlet of furnace in comparison with the results of WSGG model, which is in more agreement with the experimental data. These results indicate that if one wishes to accurately predict the temperature field and the temperature sensitive quantities such as the NOx emission, one should use the spectral-based models to calculate the radiation absorption coefficient. The details are discussed in the results section.

Computational Heat Transfer Analysis of a Furnace Using the WSGG Model

2000 ◽  
Author(s):  
Toshiaki Omori ◽  
Shunichi Yamaguchi ◽  
Toru Fusegi
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Present Model ◽  
Heat Transfer Analysis ◽  
Weighted Sum ◽  
Computationally Efficient ◽  
Reciprocity Laws ◽  
Dependent Absorption ◽  
Wsgg Model

Abstract Accurate radiative heat transfer analysis is challenging due to the strongly spectral-dependent absorption coefficient and the requirement for satisfying both the summation and reciprocity laws in thermodynamics. In the paper, nongray radiation is treated by way of a computationally efficient Weighted Sum of Gray Gases (WSGG) model without much sacrificing prediction accuracy. In the present model, three gray gas components are used, one of which simulates the radiative window. The thermodynamic laws are simultaneously treated using a Monte Carlo method subject to a symmetrization procedure. As a test problem, radiative heat transfer in an industrial model furnace is solved to demonstrate effects of gray/nongray radiation and the grid size for CFD and radiation calculations.

Evaluation of Weighted Sum of Grey Gases Coefficients for Combustion Gases Using Predicted Emissivities From High Resolution Spectroscopic Databases

2008 ◽  
Author(s):  
Mehdi Bahador ◽  
Bengt Sunden
Keyword(s):  
High Temperature ◽  
High Resolution ◽  
Weighted Sum ◽  
Combustion Gases ◽  
Partial Pressures ◽  
Wide Range ◽  
Path Lengths ◽  
Total Emissivity

A new set of weighted sum of grey gases coefficients have been predicted using new total emissivity databases for CO2-H2O mixtures and pure H2O in different ranges of pressure. For this purpose, available high temperature spectroscopic databases were verified and suitable databases were selected. By line by line calculations, the total emissivity was calculated and the effects of total and partial pressures on this parameter were investigated. Finally, sets of total emissivity data on the wide range of temperatures and pressure path lengths were predicted which were used to estimate a new weighted sum of grey gases coefficients.

scholarly journals Two test-cases for synergistic detections in the Martian atmosphere: Carbon monoxide and methane

2017 ◽  
Vol 189 ◽  
pp. 86-104 ◽  
Author(s):  
S. Robert ◽  
C. Camy-Peyret ◽  
F. Daerden ◽  
M. De Mazière ◽  
E. De Wachter ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Martian Atmosphere ◽  
Test Cases

scholarly journals IASI's sensitivity to near-surface carbon monoxide (CO): Theoretical analyses and retrievals on test cases

2017 ◽  
Vol 189 ◽  
pp. 428-440 ◽  
Author(s):  
Sophie Bauduin ◽  
Lieven Clarisse ◽  
Michael Theunissen ◽  
Maya George ◽  
Daniel Hurtmans ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Test Cases ◽  
Near Surface ◽  
Surface Carbon ◽  
Theoretical Analyses

scholarly journals Oxygen and Carbon Monoxide Equilibria of Human Adult Hemoglobin at Atmospheric and Elevated Pressure

Blood ◽  
1969 ◽  
Vol 33 (1) ◽  
pp. 57-65 ◽  
Author(s):  
F. LEE RODKEY ◽  
JOHN D. O’NEAL ◽  
HAROLD A. COLLISON
Keyword(s):  
Carbon Monoxide ◽  
Whole Blood ◽  
Atmospheric Pressure ◽  
Total Pressure ◽  
Elevated Pressure ◽  
Inert Gas ◽  
Affinity Constant ◽  
Human Hemoglobin ◽  
Relative Affinity ◽  
Adult Hemoglobin

Abstract Adult human hemoglobin has been shown to have an affinity for carbon monoxide 218 times that for oxygen at 37°. There is no change in the relative affinity between pH 6.8 and 8.8. The same value was obtained with whole blood and with concentrated undialyzed hemoglobin solutions. Measurements made at atmospheric pressure were identical with those at increased total pressure up to 21.4 atmospheres absolute. Substitution of helium for nitrogen as inert gas did not alter the value. The relative affinity constant K is increased by 2 per cent by a decrease in temperature of 1° C.

A Novel WSGG Model Based on Weighted Absorption-Emission Coefficients

2015 ◽  
Author(s):  
Rogério Brittes ◽  
Fabiano Cassol ◽  
Felipe Roman Centeno ◽  
Francis H. R. França
Keyword(s):  
Spectral Line ◽  
Radiative Transfer Equation ◽  
Computational Effort ◽  
Spectral Lines ◽  
Weighted Sum ◽  
Global Models ◽  
Spectral Integration ◽  
Constant Coefficients ◽  
Computationally Expensive ◽  
Wsgg Model

The absorption coefficient of participating species, such as CO2 and H2O, shows very irregular dependence with the wavenumber, which makes it difficult the spectral integration of the radiative transfer equation (RTE). This task can be performed with the line-by-line (LBL) integration, which is very computationally expensive due to the vast amount of spectral lines that span the spectrum. As alternatives to the LBL integration, there are global models, such as the weighted-sum-of-gray-gases (WSGG) and the spectral line weighted-sum-of-gray gases (SLW). These models replace the integration with respect to the wavenumber by the summation over a certain number of gray gases, thus reducing the computational effort. This paper shows a modification of the WSGG model, in which the absorption and emission coefficients of each gray gas are considered to be function of the temperature. The model, named WSGG with non-constant coefficients (NCC-WSGG), is applied to solve a few non-isothermal and non-homogeneous problems. The results show very satisfactory agreement with the LBL integration.

scholarly journals A study of sensitized explosions. IV. The carbon monoxide-oxygen reaction catalysed by nitrogen peroxide

1939 ◽  
Vol 172 (948) ◽  
pp. 1-28 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Total Pressure ◽  
Critical Pressure ◽  
Catalytic Effect ◽  
Oxygen Carrier ◽  
Rate Of Reaction ◽  
Pure Carbon ◽  
Catalytic Functions ◽  
Oxygen Reaction

The work of Hadman, Thompson and Hinshelwood (1932 a, b ) has shown that the reaction between pure carbon monoxide and oxygen is characterized by a region of ignition above 650° C, bounded by upper and lower critical pressure limits outside which the rate of oxidation falls to negligibly small values in the dry gases. Sagulin, Kowalsky, Kopp and Semenoff (1930) have reported that the region of ignition of moist carbon monoxide is extended more than 200° C towards lower temperatures in the presence of 0.1% nitrogen peroxide, although larger concentrations than this exert an anti-catalytic effect. Another aspect of the catalytic influence of nitrogen peroxide on the carbon monoxide-oxygen reaction is revealed by the work of Crist and Roehling (1935) and Crist and Calhoun (1936), who have found that steady reaction occurs in nitrogen peroxide sensitized mixtures at 527° C and 750 mm. total pressure. The rate of reaction varies with concentration of nitrogen peroxide in a manner shown by curve B in fig. 1, which has been taken from the paper by Crist and Roehling (1935). This graph, as shown by Crist and Roehling (1935), can be represented as the sum of two simpler curves A and C , depicting respectively distinct catalytic functions of nitrogen peroxide. Curve C was shown to be explained by a mechanism in which nitrogen peroxide, by alternate oxidation and reduction, plays the part of an oxygen carrier in accordance with the following formal equations: CO + NO 2 = CO 2 + NO, 2NO + O 2 = 2NO 2 .

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