Numerical Simulation of Radiative Heat Transfer in Multiphase Flows Via Photon Monte Carlo Methods PDF Download
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Author: David J. Tobin
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 115
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Book Description
Accurate modeling of radiative heat transfer in multiphase flows is critical for the design of many industrial processes. For this reason, robust radiation models are currently being implemented into MFiX - a CFD software package that specializes in simulating multiphase flows. It is still necessary however to quantify the error of these models by means of comparison with exact solutions, yet traditional solution methods for the complex radiative transfer equation (RTE) are computationally infeasible. Therefore, the objective of this study is to derive and implement an appropriate statistical method, known as the photon Monte Carlo (PMC) method, for the validation of radiative heat transfer calculations. Through a series of increasingly complex test cases, the PMC algorithm was verified and ultimately integrated into the MFiX framework. This work will allow for the implemented PMC algorithm to be used as a high-fidelity radiation solver in MFiX or to validate other MFiX radiation models.
Author: David J. Tobin
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 115
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Book Description
Accurate modeling of radiative heat transfer in multiphase flows is critical for the design of many industrial processes. For this reason, robust radiation models are currently being implemented into MFiX - a CFD software package that specializes in simulating multiphase flows. It is still necessary however to quantify the error of these models by means of comparison with exact solutions, yet traditional solution methods for the complex radiative transfer equation (RTE) are computationally infeasible. Therefore, the objective of this study is to derive and implement an appropriate statistical method, known as the photon Monte Carlo (PMC) method, for the validation of radiative heat transfer calculations. Through a series of increasingly complex test cases, the PMC algorithm was verified and ultimately integrated into the MFiX framework. This work will allow for the implemented PMC algorithm to be used as a high-fidelity radiation solver in MFiX or to validate other MFiX radiation models.
Author: Michael F. Modest
Publisher: Academic Press
ISBN: 032398407X
Category : Science
Languages : en
Pages : 1018
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Book Description
Radiative Heat Transfer, Fourth Edition is a fully updated, revised and practical reference on the basic physics and computational tools scientists and researchers use to solve problems in the broad field of radiative heat transfer. This book is acknowledged as the core reference in the field, providing models, methodologies and calculations essential to solving research problems. It is applicable to a variety of industries, including nuclear, solar and combustion energy, aerospace, chemical and materials processing, as well as environmental, biomedical and nanotechnology fields. Contemporary examples and problems surrounding sustainable energy, materials and process engineering are an essential addition to this edition. - Includes end-of-chapter problems and a solutions manual, providing a structured and coherent reference - Presents many worked examples which have been brought fully up-to-date to reflect the latest research - Details many computer codes, ranging from basic problem solving aids to sophisticated research tools
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
Radiation heat transfer in an array of fixed discrete surfaces is an important problem that is particularly difficult to analyze because of the nonhomogeneous and anisotropic optical properties involved. This article presents an efficient Monte Carlo method for evaluating radiation heat transfer in arrays of fixed discrete surfaces. This Monte Carlo model has been optimized to take advantage of the regular arrangement of surfaces often encountered in these arrays. Monte Carlo model predictions have been compared with analytical and experimental results.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 122
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Book Description
Methods of spectral diagnostics of nonhomogeneous volumes of heated gases are the most challenging for investigation of exhaust plumes of the hydrogen and carbon-hydrogen fuels. Computing methods of calculation of spectral heat radiation emissivity are the components of the general problem. The numerical simulation of plumes radiation is a challenging problem because there is a large number of different factors which characterize the phenomena of the spectral radiation transfer in the multiphase flows. There have been many previous computational simulations of liquid and solid rocket motor plumes radiation signatures using a wide range of computational methods and models. There is a large practical need for new methods of calculation of selective radiation heat transfer, allowing to take into account rotary structure of a molecular spectrum. There is also a need to provide a capability of comparative analysis of different methods. This paper seeks to meet these needs through comparison of numerical simulations. This project has a basic research character, because computing models and codes may be used not only for aerospace applications but also for astrophysics, optics of atmosphere, physics and chemistry of the low-temperature plasma, etc.
Author: Robert Kasper
Publisher: Cuvillier Verlag
ISBN: 3736964196
Category : Technology & Engineering
Languages : en
Pages : 178
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Book Description
Durch die gezielte Strukturierung von wärmeübertragenden Oberflächen, wie beispielsweise durch Dellen oder Rippen, kann die örtliche Turbulenz und damit die thermische Durchmischung gesteigert werden. Dies kann die Effizienz von Wärmeübertragern oder Bauteilkühlsystemen erheblich erhöhen. Derartige Oberflächenstrukturrierungen begünstigen jedoch das Partikelfouling, daher die Ablagerung suspendierter Partikel, wie z.B. Sand, Schlamm oder Korrosionsprodukte. Gegenstand dieser Arbeit ist die Entwicklung eines universellen, numerischen CFD-Verfahrens zur Vorhersage des partikulären Foulings auf strukturierten Oberflächen, speziell Dellenoberflächen. Das entwickelte Verfahren basiert auf einer Kombination des Lagrangian-Particle-Trackings zur Beschreibung der dispersen Phase (Foulingpartikel), sowie räumlich und zeitlich aufgelöster Large-Eddy Simulation für die Berechnung der kontinuierlichen Phasen (Trägerfluid). Dieses Vorgehen ermöglicht nicht nur die Auswertung der infolge der Partikelablagerungen verminderten thermo-hydraulischen Effizienz, sondern auch die Untersuchung der Wechselwirkungen zwischen turbulenten Strömungsstrukturen und dem partikulärem Fouling. Dadurch kann gezeigt werden, dass die Verwendung von sphärischen Dellen als Oberflächenstrukturen nicht nur aus thermo-hydraulischer Sicht die optimale Wahl darstellt, sondern auch eine substantielle Verminderung des Partikelfoulings begünstigt. The application of structured heat transfer surfaces, such as dimples or ribs, increase the local turbulence and thus thermal mixing. This can improve the efficiency of heat exchangers or cooling systems significantly. However, structured surfaces are known to promote particulate fouling, hence the unwanted accumulation and deposition of suspended particles (e.g., silt, sludge or iron oxide). The scope of this work is the development of a universal numerical CFD method for the prediction of particulate fouling, especially on dimpled surfaces. The proposed approach is based on a combination of the Lagrangian point-particle tracking for the description of the disperse phase (fouling particles), and spatially and temporally resolved large-eddy simulations for the calculation of the continuous phase (carrier fluid). This approach allows not only the evaluation of the reduced thermo-hydraulic efficiency due to particle deposition, but also the investigation of the interaction between turbulent flow structures and the particulate fouling. It can be shown that the usage of spherical dimples as surface structures is not only the optimal choice from a thermo-hydraulic point of view, but also favors a substantial reduction of particulate fouling.
Author: Jiwen Liu
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 320
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Book Description
Author: Ralph Erwin Stockhausen
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 314
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Book Description
Author: Nikolay Ivanov Kolev
Publisher: Springer Science & Business Media
ISBN: 3642213723
Category : Technology & Engineering
Languages : en
Pages : 683
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Book Description
Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry. The industrial use of multi-phase systems requires analytical and numerical strategies for predicting their behavior. .In its fourth extended edition the successful monograph package “Multiphase Flow Daynmics” contains theory, methods and practical experience for describing complex transient multi-phase processes in arbitrary geometrical configurations, providing a systematic presentation of the theory and practice of numerical multi-phase fluid dynamics. In the present third volume methods for describing of the thermal interactions in multiphase dynamics are provided. In addition a large number of valuable experiments is collected and predicted using the methods introduced in this monograph. In this way the accuracy of the methods is revealed to the reader. This fourth edition includes various updates, extensions, improvements and corrections. "The literature in the field of multiphase flows is numerous. Therefore, it is very important to have a comprehensive and systematic overview including useful numerical methods. The volumes have the character of a handbook and accomplish this function excellently. The models are described in detail and a great number of comprehensive examples and some cases useful for testing numerical solutions are included. These two volumes are very useful for scientists and practicing engineers in the fields of technical thermodynamics, chemical engineering, fluid mechanics, and for mathematicians with interest in technical problems. Besides, they can give a good overview of the dynamically developing, complex field of knowledge to students. This monograph is highly recommended,” BERND PLATZER, ZAAM In the present third volume methods for describing of the thermal interactions in multiphase dynamics are provided. In addition a large number of valuable experiments is collected and predicted using the methods introduced in this monograph. In this way the accuracy of the methods is revealed to the reader. This fourth edition includes various updates, extensions, improvements and corrections. "The literature in the field of multiphase flows is numerous. Therefore, it is very important to have a comprehensive and systematic overview including useful numerical methods. The volumes have the character of a handbook and accomplish this function excellently. The models are described in detail and a great number of comprehensive examples and some cases useful for testing numerical solutions are included. These two volumes are very useful for scientists and practicing engineers in the fields of technical thermodynamics, chemical engineering, fluid mechanics, and for mathematicians with interest in technical problems. Besides, they can give a good overview of the dynamically developing, complex field of knowledge to students. This monograph is highly recommended,” BERND PLATZER, ZAAM
Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781728997261
Category :
Languages : en
Pages : 36
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Book Description
The Monte Carlo method (MCM) is employed to study the radiative interactions in fully developed laminar flow between two parallel plates. Taking advantage of the characteristics of easy mathematical treatment of the MCM, a general numerical procedure is developed for nongray radiative interaction. The nongray model is based on the statistical narrow band model with an exponential-tailed inverse intensity distribution. To validate the Monte Carlo simulation for nongray radiation problems, the results of radiative dissipation from the MCM are compared with two available solutions for a given temperature profile between two plates. After this validation, the MCM is employed to solve the present physical problem and results for the bulk temperature are compared with available solutions. In general, good agreement is noted and reasons for some discrepancies in certain ranges of parameters are explained. Liu, Jiwen and Tiwari, S. N. Unspecified Center NAG1-363...
Author: Lixin Cheng
Publisher: Bentham Science Publishers
ISBN: 160805229X
Category : Science
Languages : en
Pages : 215
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Book Description
"Multiphase flow and heat transfer have found a wide range of applications in several engineering and science fields such as mechanical engineering, chemical and petrochemical engineering, nuclear engineering, energy engineering, material engineering, ocea"
