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Radiative Transfer in Combustion Systems: Fundamentals and Applications
Radiative Transfer in Combustion Systems: Fundamentals and Applications
Raymond Viskanta
Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, USA

Aims and Scope

Destined to clarify the research, development, and design requirements in modern and computational terms needed for sustainable technological advances. Written for the combustion scientist/engineer to understand radiative effects on the pollution of the environment. Interrelates the process of thermodynamics, chemical kinetics, fluid mechanics, heat and mass transfer and turbulence. Includes computational design tools. Lays the foundation for modeling and prediction of chemically reacting combustion systems; collects data for operation of combustion devices. Analyzes the construction, use, and numerical results of combustion systems simulation.



460 pages, ©2005

TABLE OF CONTENTS:

Preface


Symbols


Acronyms


Chapter 1: Introduction


1.1 Combustion in Nature and Technology


1.2 Physical Nature of Radiation


1.2.1 Duality of radiation phenomena


1.2.2 Identity of radiant energy and light


1.2.3 Electromagnetic spectrum


1.2.4 Thermal radiation


1.3 Electromagnetic Wave Theory


1.3.1 Propagation and attenuation of radiation


1.3.2 Reflection and refraction of radiation


1.4 Definitions


1.4.1 Intensity of radiation (radiance)


1.4.2 Radiant energy density


1.4.3 Irradiance


1.4.4 Radiant energy flux vector


1.4.5 Moments of intensity


1.4.6 Total radiant energy quantities


1.5 Interaction of Radiation with Matter


1.5.1 Absorption, scattering, and extinction (attenuation) coefficients


1.5.2 Scattering phase function


1.6 Interaction of Radiation with an Interface


1.7 Radiation Scaling Parameters


References


Chapter 2: Thermodynamics and Physics of Blackbody Radiation


2.1 Thermodynamics of Radiation


2.1.1 Isothermal cavity


2.1.2 Concept of a blackbody


2.1.3 Kirchhoff's laws


2.2 Concept of Emissivity


2.2.1 Definition of emissivity


2.2.2 Relation between absorptivity and emissivity


2.3 Radiation Pressure


2.4 Entropy of Radiation


2.5 Laws of Blackbody Radiation


2.5.1 Planck's law


2.5.2 Asymptotic forms of Planck's law


2.5.3 Stefan-Boltzmann law


2.6 Fractional Blackbody Functions


2.7 Spectral Distribution of Blackbody Radiation


References


Chapter 3: Basic Equations of Radiative Transfer


3.1 Radiative Transfer Theory and Its Postulates


3.2 Radiative Transfer Equation


3.3 Special Forms of the Radiative Transfer Equation


3.4 Integral Form of the Radiative Transfer Equation


3.4.1 Radiation along a homogeneous path


3.4.2 Radiating gas adjacent to a wall


3.4.3 Radiation from an isothermal gas volume


3.5 Conservation Equations


3.5.1 Radiant energy transport equation


3.5.2 Transport of radiant momentum


3.6 Radiative Transfer Regimes


3.6.1 Optically thin approximation


3.6.2 Optically thick approximation


3.7 Conservation Equations for Reacting Gas Mixtures


3.7.1 Conservation equations of mass, species, and momentum


3.7.2 Conservation equation of energy


3.7.3 Conservation equations for turbulent flows


References


Chapter 4: Radiation Characteristics of Gaseous Combustion Products


4.1 Introduction


4.2 Fundamental Concepts of Modern Radiation Physics


4.2.1 Fundamentals of gas molecular spectra


4.2.2 Microscopic radiative interactions


4.2.3 Relations between Einstein's probability coefficients and macroscopic coefficients


4.3 Line Models


4.3.1 Characterization of an isolated line


4.3.2 Total absorption by an isolated line


4.3.3 Line-by-line calculations of the absorption coefficient


4.4 Narrow-Band Models


4.4.1 Elsasser model


4.4.2 Statistical models


4.4.3 Decomposition-based narrow-band models


4.4.4 Nonhomogeneous gas models


4.5 Wide-Band Models


4.5.1 Box (top hat) model


4.5.2 Exponential wide-band model


4.5.3 Isothermal total band absorptance correlations


4.5.4 Exponential wide-band model for nonhomogeneous gases


4.6 Total Absorptance-Emittance Correlations


4.6.1 Database for CO2 and H2O


4.6.2 Empirical emittance-absorption correlations


4.6.3 Emipirical correlations for the total emittance of gaseous combustion products


4.7 Spectrum Integrated Hybrid Models for Total Emittance


4.7.1 SG and CK methods


4.7.2 Spectral line-based model


4.7.3 ADF and ADFFG approaches


4.8 Global Radiative Transfer Methods


4.8.1 Effective absorption coefficients


4.8.2 Mean absorption/emission coefficients


4.9 Concluding Summary Remarks


References


Chapter 5: Radiation Characteristics of Particles and Particle/Gas Mixtures


5.1 Introduction


5.2 Absorption and Scattering from a Single Sphere: Mie Theory


5.2.1 Mie efficiency factors


5.2.2 Limiting solutions for efficiency factors


5.2.3 Scattering distribution (phase) function


5.3 Absorption and Scattering by Nonspherical Particles


5.4 Radiation Characteristics of Polydispersions


5.4.1 Extincion coefficients and scattering albedo


5.4.2 Calculation of mean characteristics


5.5 Internal Distribution of Absorbed Radiation within an Irradiated Sphere


5.5.1 EM theory


5.5.2 Geometric optics approach


5.6 Radiation Characteristics of Soot Particles in Flames


5.6.1 Spectral absorption coefficient


5.6.2 Total directional emittance


5.6.3 Mean absorption coefficients of soot


5.7 Total Emittance of Gas/Soot Mixtures


5.8 Spectral Radiation Characteristics of Gas/Particle Mixtures


5.8.1 Spectral hemispherical characteristics


5.8.2 Total hemispherical characteristics of mixtures


5.9 Concluding Summary Remarks


References


Chapter 6: Radiation Exchange in Combustion Systems


6.1 Discussion of Radiation Exchange in Enclosures


6.2 Radiant Energy Balance at an Enclosure Wall


6.2.1 Radiation intensity leaving an enclosure wall


6.2.2 Integral equations for leaving intensity


6.3 Radiative Transfer in One-Dimensional Media


6.3.1 Radiative transfer in a plane layer


6.3.2 Radiative transfer in a cylindrical scattering medium


6.3.3 Radiative transfer in a spherical medium


6.4 Two-Dimensional Radiative Transfer


6.4.1 Two-dimensional rectangular enclosure


6.4.2 Radiative transfer in a finite-length cylindrical enclosure


6.5 Radiative Transfer in Multidimensional Enclosures Containing a Participating Medium


6.5.1 Results for diffuse enclosure walls


6.5.2 Special cases for multidimensional enclosures


6.6 Concluding Summary Remarks


References


Chapter 7: Computational Methods for Radiative Transfer


7.1 Selection of Method


7.2 Overview of Computational Methods


7.2.1 Directional treatment


7.2.2 Spectral treatment


7.3 Computation of Multidimensional Radiative Transfer


7.3.1 Multiflux methods (MFMs)


7.3.2 Differential (PN) approximation


7.3.3 Discrete ordinates method (DOM)


7.3.4 Finite volume method (FVM)


7.3.5 Discrete transfer method (DTM)


7.4 Critical Assessment of RTE Solution Methods


7.4.1 Comparison of radiative transfer models


7.4.2 Radiative transfer model validation


7.5 Modeling of the Spectral Nature of Radiative Transfer


7.5.1 Benchmark: Integration over the spectrum


7.5.2 WSGG model and enhancements


7.5.3 CK model extensions for gas mixtures


7.5.4 Gas/particle mixtures


7.6 Comparison of Global Results


7.6.1 Comparison of global computational results


7.6.2 Comparison of global and experimental results


7.7 Concluding Summary Remarks


References


Chapter 8: Combustion Phenomena Affected by Radiation


8.1 Introduction


8.2 Ignition of Solids


8.2.1 Ignition of an opaque exothermic solid by radiation


8.2.2 Ignition of a semitransparent solid by radiation


8.3 Ignition of a Vertical Slab by Radiation


8.4 Ignition of Solid Fuel in an Enclosure by Radiation


8.5 Radiation and Flame Spread


8.5.1 Upward and downward flame spread along a vertical solid


8.5.2 Opposed-flow flame spread


8.6 Effects of Radiation on Extinction of Laminar Diffusion Flames


8.7 Radiation-Affected Ignition of Solid-Gas Mixtures


8.7.1 Ignition of inert particles-oxidizer gas


8.7.2 Ignition of fuel spray-oxidizer mixture


8.8 Concluding Summary Remarks


References


Chapter 9: Radiation Effects in Laminar Flames


9.1 Introduction


9.2 Radiation Effects in Opposed-Flow Flames


9.2.1 Opposed-flow combustion model


9.2.2 Radiative transfer models


9.2.3 Diffusion flames


9.2.4 Premixed flames


9.2.5 Partially premixed flames


9.3 Radiation Effects in Axisymmetric Jet Diffusion Flames


9.4 Radiation Effects in Axisymmetric Luminous Diffusion Flames


9.4.1 Combustion and radiation models


9.4.2 Results of simulations


9.5 Diffusion Flame at an Axisymmetric Stagnation Point


9.6 Gas-Phase Radiation Effects on the Burning of Fuel


9.6.1 Laminar diffusion flame adjacent to a vertical flat plate burner


9.6.2 Combustion of a pyrolyzing fuel slab


9.7 Droplet Combustion


9.7.1 Model description


9.7.2 Modeling results


9.8 Concluding Summary Remarks


References


Chapter 10: Radiation in Turbulent Flames


10.1 Introduction


10.2 Radiation from Flames


10.2.1 Global radiation fraction measurements


10.2.2 Total incident radiant heat flux measurements


10.2.3 Spectral measurements


10.3 RTE for Turbulent Chemically Reacting Flows


10.3.1 RTE for turbulent flow


10.3.2 Optically thin and thick approximations for turbulent flow


10.4 Radiative Transfer in Turbulent Flames


10.4.1 Flame radiation: Mean-property model


10.4.2 Flame radiation: Stochastic model


10.4.3 Application of models and comparisons with data


10.5 Radiative Transfer in Turbulent Flames: Turbulence/Radiation Interaction Methods


10.5.1 Differential model


10.5.2 P1-approximation model


10.5.3 TRI model assessment


10.6 Modeling of Turbulent Nonpremixed Flames: Flamlet Model


10.6.1 Laminar flamlet model with radiation


10.6.2 Application of the flamlet model to radiating flames


10.7 Radiation in Luminous Turbulent Diffusion Flames


10.7.1 Soot formation model


10.7.2 Radiative transfer model for sooty flames


10.7.3 Application of models to luminous flames


10.8 Effect of Radiation on NOx Emissions in Nonpremixed Flames


10.9 Concluding Summary Remarks


References


Chapter 11: Radiative Transfer in Combustion Chambers


11.1 Introduction


11.2 Radiation Scaling Parameters for Turbulent Chemically Reacting Flows


11.3 Gas-Fired Combustion Chambers


11.3.1 Axisymmetric combustion chamber


11.3.2 Turbulence/combustion models


11.3.3 Turbulence/radiation models


11.3.4 Radiative transfer model


11.3.5 Model assessments


11.4 Accounting for Soot in Combustion Chambers


11.5 Three-Dimensional Rectangular Chambers


11.5.1 Mathematical model description


11.5.2 Model assessments


11.5.3 Swirling combustors


11.6 Radiative Transfer in Gas Turbine Combustors


11.6.1 Computation of radiative transfer


11.6.2 Comparison of calculated and measured spectral intensities


11.6.3 Modeling assessment


11.7 TRI in Combustion Chambers


11.7.1 Modeling of TRI


11.7.2 Results for confined turbulent diffusion flames


11.8 Concluding Summary Remarks


References


Chapter 12: Combustion and Heat Transfer in Furnaces


12.1 Introduction


12.2 Heat Transfer in a Well-Stirred Furnace


12.2.1 Steady-state heat transfer model for a well-stirred furnace


12.2.2 Dynamic well-stirred furnace


12.2.3 Model applications


12.3 One-Dimensional (Plug-Flow) Furnace Model


12.3.1 Batch plug-flow furnace model


12.3.2 Furnaces with continuously moving load


12.4 Cylindrical Turbulent Combustion Furnace Models


12.4.1 Model description


12.4.2 Turbulence/combustion and turbulence/radiation modeling


12.4.3 Applications to furnaces


12.5 Multidimensional Furnace Models


12.5.1 Model description


12.5.2 Turbulence/combustion and turbulence/radiation modeling


12.5.3 Industrial applications


12.6 Intensification of Heat Transfer in Furnaces


12.6.1 Enhancement of flame radiation


12.6.2 Heat recirculation


12.6.3 Heat transfer from impinging flame jets


12.7 Concluding Summary Remarks


References


Chapter 13: Two-Phase Turbulent Combustion


13.1 Introduction


13.2 Description of Radiative Transfer in Spray Combustion


13.2.1 Radiative transfer in spray combustion


13.2.2 Absorption and scattering coefficients of fuel droplets


13.2.3 Soot absorption coefficient


13.3 Spray Combustion in One-Dimensional Systems


13.4 Spray Combustion in a Cylindrical Furnace


13.4.1 Mathematical description of combusting sprays


13.4.2 Radiative transfer in spray combustion systems


13.4.3 Applications of spray combustion with radiation


13.5 Description of Radiative Transfer in Pulverized Coal Combustion


13.5.1 Radiation characteristics of pulverized coals


13.5.2 Radiation characteristics of flyash


13.6 Pulverized Coal Combustion in One-Dimensional Systems


13.7 Pulverized Coal Combustion in Furnaces


13.7.1 Radiative transfer in pulverized coal-fired furnaces


13.7.2 Applications to furnaces and boilers


13.8 Concluding Summary Remarks


References


Chapter 14: Unwanted Fires


14.1 Introduction


14.2 Scaling of Simple Fires


14.2.1 Scaling of pool fire


14.2.2 Scaling of vertical wall fire


14.3 Laminar Pool Fires


14.4 Radiation from Turbulent Pool Fires


14.4.1 Flame structure of pool fires


14.4.2 Radiation feedback in pool fires


14.4.3 Global modeling of irradiation from pool flames


14.5 Numerical Simulation of Pool Fires


14.6 Compartment (Enclosure) Fires


14.6.1 Phenomenological description


14.6.2 Radiative transfer modeling


14.6.3 Selected applications


14.7 Fire Suppression by Water Sprays


14.7.1 Radiation characteristics of water sprays


14.7.2 Evaporation of a water droplet


14.7.3 Applications to compartment fire suppression


14.8 Fire Spread through Fuel Beds


14.8.1 Phenomenological description


14.8.2 Radiative transfer in wildland fires


14.8.3 Fire-spread modeling


14.9 Concluding Summary Remarks


References


Chapter 15: Premixed Combustion in Inert Porous Media


15.1 Introduction


15.2 Physical and Mathematical Description of Combustion in a PIM


15.2.1 Physical description


15.2.2 Mathematical description


15.3 Radiative Transfer in porous media


15.3.1 Packed beds


15.3.2 Open-cell materials


15.4 Combustion in a Refractory Tube


15.4.1 One-dimensional model results


15.4.2 Two-dimensional model results


15.5 Overview of Premixed Porous-Media Combustors


15.6 Premixed Porous-Medium Burner


15.6.1 Mathematical burner description


15.6.2 Applications to burners


15.6.3 Applications to burners/heaters


15.6.4 Applications to PIM embedded heaters


15.7 Premixed Combustion in Porous Burners/Radiant Heaters


15.7.1 Model description


15.7.2 Results of applications


15.8 Concluding Summary Remarks


References


INDEX


ISBN: 1-56700-211-0

Price: $254.00

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