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Author : A. Mehranpour
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (11 download)
Download or read book Numerical Simulation (CFD) of Radiative Heat Transfer in a Tubular Combustor written by A. Mehranpour and published by . This book was released on 2006 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : B. Sundén
Publisher : WIT Press
ISBN 13 : 1845647947
Total Pages : 549 pages
Book Rating : 4.8/5 (456 download)
Download or read book Heat Transfer XIII written by B. Sundén and published by WIT Press. This book was released on 2014-07-02 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat Transfer XIII: Simulation and Experiments in Heat and Mass Transfer contains the proceedings of the thirteenth conference in the well established series on Simulation and Experiments in Heat Transfer and its applications. Advances in computational methods for solving and understanding heat transfer problems continue to be important because heat transfer topics and related phenomena are commonly of a complex nature and different mechanisms like heat conduction, convection, turbulence, thermal radiation and phase change as well as chemical reactions may occur simultaneously. Typically, applications are found in heat exchangers, gas turbine cooling, turbulent combustion and fires, fuel cells, batteries, micro- and mini- channels, electronics cooling, melting and solidification, chemical processing etc. Heat Transfer might be regarded as an established and mature scientific discipline, but it has played a major role in new emerging areas such as sustainable development and reduction of greenhouse gases as well as for micro- and nano- scale structures and bioengineering. Non-linear phenomena other than momentum transfer may occur due to temperature-dependent thermophysical properties. In engineering design and development, reliable and accurate computational methods are requested to replace or complement expensive and time consuming experimental trial an error work. Tremendous advancements have been achieved during recent years due to improved numerical solution methods for non-linear partial differential equations, turbulence modelling advancements and developments of computers and computing algorithms to achieve efficient and rapid simulations. Nevertheless, to further progress in computational methods requires developments in theoretical and predictive procedures – both basic and innovative – and in applied research. Accurate experimental investigations are needed to validate the numerical calculations. Topics covered include: Heat transfer in energy producing devices; Heat transfer enhancements; Heat exchangers; Natural and forced convection and radiation; Multiphase flow heat transfer; Modelling and experiments; Heat recovery; Heat and mass transfer problems; Environmental heat transfer; Experimental and measuring technologies; Thermal convert studies.
Download or read book CFD Fire Simulation Using Mixture Fraction Combustion and Finite Volume Radiative Heat Transfer written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kshitij V. Deshmukh
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (5 download)
Download or read book Direct Numerical Simulation and Radiation Monte Carlo for Turbulence?radiation Interactions in Combustion Systems written by Kshitij V. Deshmukh and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent combustion is encountered in many industrial applications such as combustors, nozzles, turbines, engines and furnaces. The increasing concern for pollutant emissions to the environment has led to a wide interest in studying the process in detail using numerical simulation with an aim to develop predictive models that would minimize expensive experiments. Three main approaches in this direction are direct numerical simulation (DNS), large eddy simulation (LES) and Reynolds average simulation (RAS). Moreover, the presence of high temperatures in turbulent combustion results in substantial heat transfer by radiation. Most work until today has either simplified or neglected radiation. This leads to neglect of turbulence?radiation interactions (TRI). In this work, DNS is coupled with a photon Monte Carlo method to solve the radiative transfer equation (RTE) to isolate and quantify TRI. A canonical statistically one-dimensional turbulent premixed combustion system is studied. The inflow boundary condition is improved to introduce turbulence and to help simulate a quasi-stationary flow. Both emission TRI and absorption TRI were found to be significant. A statistical analysis showed that using a moving average over time of the radiative source term reduces statistical noise and saves valuable computational resources without affecting the overall solution. For the first time, a third-order spherical harmonics method, P3 approximation is coupled with DNS to replace the photon Monte Carlo method. A canonical turbulent premixed combustion system is simulated and TRI are studied at large-to-small optical thicknesses. Emission TRI was found to be significant at all optical thickness, while absorption TRI was important at large and intermediate optical thickness and negligible at the optically thin limit. The implementation of the P3 approximation is seen as a viable alternative to the costly photon Monte Carlo method. Elliptic equations are typically solved in RAS-based and LES-based modeling and the P3 approximation consists of six elliptical partial differential equations (PDEs). It is hoped that the demonstration of use of the P3 approximation will generate interest for it to be included in future LES and RAS approaches and developments. A low-order model for LES using a?-PDF approach is also developed for a canonical statistically one-dimensional turbulent nonpremixed system. The mixture fraction and its variance are inputs to the model to obtain a PDF of mixture fraction. With the knowledge of the PDF of mixture fraction, the quantities that are functions of mixture fraction are convoluted with the mixture fraction PDF to obtain the chemical source term and the radiative emission terms. The mean profiles are predicted correctly but the nonlinear terms of radiative emission are not captured accurately, as the?-PDF cannot provide information for the higher-order terms. Still, as a one-equation model to be used as a first pass for LES simulation, this model has its advantages in that it is easy to implement and uses negligible additional computational resources over what is required for LES without any models.
Author : Charles E. Baukal, Jr.
Publisher : CRC Press
ISBN 13 : 9780849320002
Total Pages : 650 pages
Book Rating : 4.3/5 (2 download)
Download or read book Computational Fluid Dynamics in Industrial Combustion written by Charles E. Baukal, Jr. and published by CRC Press. This book was released on 2000-10-26 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although many books have been written on computational fluid dynamics (CFD) and many written on combustion, most contain very limited coverage of the combination of CFD and industrial combustion. Furthermore, most of these books are written at an advanced academic level, emphasize theory over practice, and provide little help to engineers who need to use CFD for combustion modeling. Computational Fluid Dynamics in Industrial Combustion fills this gap in the literature. Focusing on topics of interest to the practicing engineer, it codifies the many relevant books, papers, and reports written on this combined subject into a single, coherent reference. It looks at each topic from a somewhat narrow perspective to see how that topic affects modeling in industrial combustion. The editor and his team of expert authors address these topics within three main sections: Modeling Techniques-The basics of CFD modeling in combustion Industrial Applications-Specific applications of CFD in the steel, aluminum, glass, gas turbine, and petrochemical industries Advanced Techniques-Subjects rarely addressed in other texts, including design optimization, simulation, and visualization Rapid increases in computing power and significant advances in commercial CFD codes have led to a tremendous increase in the application of CFD to industrial combustion. Thorough and clearly representing the techniques and issues confronted in industry, Computational Fluid Dynamics in Industrial Combustion will help bring you quickly up to date on current methods and gain the ability to set up and solve the various types of problems you will encounter.
Author : Michael F. Modest
Publisher : Springer
ISBN 13 : 3319272918
Total Pages : 167 pages
Book Rating : 4.3/5 (192 download)
Download or read book Radiative Heat Transfer in Turbulent Combustion Systems written by Michael F. Modest and published by Springer. This book was released on 2016-01-06 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introduction reviews why combustion and radiation are important, as well as the technical challenges posed by radiation. Emphasis is on interactions among turbulence, chemistry and radiation (turbulence-chemistry-radiation interactions – TCRI) in Reynolds-averaged and large-eddy simulations. Subsequent chapters cover: chemically reacting turbulent flows; radiation properties, Reynolds transport equation (RTE) solution methods, and TCRI; radiation effects in laminar flames; TCRI in turbulent flames; and high-pressure combustion systems. This Brief presents integrated approach that includes radiation at the outset, rather than as an afterthought. It stands as the most recent developments in physical modeling, numerical algorithms, and applications collected in one monograph.
Author : A. M. Bagabir
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (643 download)
Download or read book Numerical Simulation of Two-dimensional Flow and Heat Transfer Around a Hexagonal-shaped Combustion Chamber written by A. M. Bagabir and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ricardo Lopez-Ruiz
Publisher : BoD – Books on Demand
ISBN 13 : 9535125648
Total Pages : 442 pages
Book Rating : 4.5/5 (351 download)
Download or read book Numerical Simulation written by Ricardo Lopez-Ruiz and published by BoD – Books on Demand. This book was released on 2016-08-24 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays mathematical modeling and numerical simulations play an important role in life and natural science. Numerous researchers are working in developing different methods and techniques to help understand the behavior of very complex systems, from the brain activity with real importance in medicine to the turbulent flows with important applications in physics and engineering. This book presents an overview of some models, methods, and numerical computations that are useful for the applied research scientists and mathematicians, fluid tech engineers, and postgraduate students.
Author : Philippe Wautelet
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (11 download)
Download or read book CFD Simulation of Combustion and Heat Transfer in a Gas Turbine Combustor written by Philippe Wautelet and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wenxi Tian
Publisher : Frontiers Media SA
ISBN 13 : 2832533264
Total Pages : 219 pages
Book Rating : 4.8/5 (325 download)
Download or read book CFD Applications in Nuclear Engineering written by Wenxi Tian and published by Frontiers Media SA. This book was released on 2023-08-21 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: High fidelity nuclear reactor thermal hydraulic simulations are a hot research topic in the development of nuclear engineering technology. The three-dimensional Computational Fluid Dynamics (CFD) and Computational Multi-phase Fluid Dynamics (CMFD) methods have attracted significant attention in predicting single-phase and multi-phase flows under steady-state or transient scenarios in the field of nuclear reactor engineering. Compared with three-dimensional thermal hydraulic methods, the traditional one-dimensional system analysis method contains inherent defects in the required accuracy and spatial resolution for a number of important nuclear reactor thermal-hydraulic phenomena. At present the CFD method has been widely adopted in the nuclear industry, across both light water reactors and liquid metal cooled fast reactors, providing an effective solution for complex issues of thermal hydraulic analysis. However, the CFD method employs empirical models for turbulence simulation, heat transfer, multi-phase interaction and chemical reactions. Such models must be validated before they can be used with confidence in nuclear reactor applications. In addition, user practice guidelines play a critical role in achieving reliable results from CFD simulations.
Author : Jianping Zhu
Publisher : IntechOpen
ISBN 13 : 9789533074306
Total Pages : 574 pages
Book Rating : 4.0/5 (743 download)
Download or read book Computational Simulations and Applications written by Jianping Zhu and published by IntechOpen. This book was released on 2011-10-26 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to introduce researchers and graduate students to a broad range of applications of computational simulations, with a particular emphasis on those involving computational fluid dynamics (CFD) simulations. The book is divided into three parts: Part I covers some basic research topics and development in numerical algorithms for CFD simulations, including Reynolds stress transport modeling, central difference schemes for convection-diffusion equations, and flow simulations involving simple geometries such as a flat plate or a vertical channel. Part II covers a variety of important applications in which CFD simulations play a crucial role, including combustion process and automobile engine design, fluid heat exchange, airborne contaminant dispersion over buildings and atmospheric flow around a re-entry capsule, gas-solid two phase flow in long pipes, free surface flow around a ship hull, and hydrodynamic analysis of electrochemical cells. Part III covers applications of non-CFD based computational simulations, including atmospheric optical communications, climate system simulations, porous media flow, combustion, solidification, and sound field simulations for optimal acoustic effects.
Author : Elmabrouk Mohamed Elmabrouk
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (812 download)
Download or read book Enhance the Heat Transfer in a Heat Treatment Furnace Through Improving the Combustion Process in the Radiation Tubes written by Elmabrouk Mohamed Elmabrouk and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiation tube burner systems are widely used as in-direct heating systems in heat treatment furnaces. Saving energy through improving the combustion and heat transfer process in the radiation tubes has become a pressing issue in the heat treatment industry over the last few years. The material structure during the process of heat treatment is predominantly determined by the temperature. The heat treatment processes usually require an even temperature distribution inside the furnace over a long duration to achieve the desired material properties. Due to the rising energy costs and the environmental concerns regarding the combustion emissions, reducing energy consumption has become a significant area of concern for the industry. This research is aimed at improving the combustion process in the radiation tubes to enhance the heat transfer to the heat treatment chamber, therefore achieving the objective of making energy savings. As a measure of improving the energy efficiency in the heat treatment furnace, Single End Radiant Tube burners (SET) were used to replace Vtube combustion systems. The energy efficiencies of the SET and V-tube combustion systems were experimentally verified in two full-scale working furnaces. This project carried out a quantitative analysis of the combustion and heat transfer processes in the radiation tubes and the heating chamber using Computational Fluid Dynamics (CFD) simulations. One of the main objectives of the project was to optimize the design of the furnace heating system with the aid of validated CFD simulations. Experimental data obtained in the full-scale working furnaces were used for the validation of the CFD simulations and to provide the boundary conditions for the CFD cases. Experimental instruments were installed in two heat treatment furnaces to measure the fuel flow rates in the radiation tubes, their surface temperatures and the temperature distribution inside the heat treatment furnaces. The fuel flow rates were used to determine the energy efficiencies of the heat systems and the fuel inlet conditions for the CFD cases. The measurements of the outer surface temperatures of the radiation tubes were used to determine an average temperature as the boundary conditions for CFD simulations of the combustion process inside the SET burner. The temperature distributions inside the furnace heating chamber were examined by measuring the temperature at specific points using a thermocouple matrix. This temperature measurement provided data to validate the CFD simulations of heat transfer inside the furnace heating chamber. Three series of CFD simulations were carried out in this project. The cases in the first series of CFD simulations were based on the SET burner. The flow mixing, combustion and heat transfer process in the SET burner were analyzed in the baseline CFD case, and the influence of radiation models on the CFD simulations were investigated. The design parameters, such as the effect of the burner diameter, were also verified in the baseline CFD studies. Using the baseline case as a reference, a numerical study was carried out to explore the applications of advanced combustion technologies, such as high temperature air combustion (HiT AC) and two-stage combustion with preheated air in the SET. The results of the CFD simulations were used to determine the heat flux rates through the SET burner wall into the heating chamber, which were used as the boundary conditions for the CFD simulations of the heating chamber in the second series of CFD cases. A good agreement was found between the numerically predicted temperatures at specified points inside the furnace heating chamber and the experimentally measured temperatures at the same points. This demonstrated that the heat flux rates from the SET burners can be applied in CFD-aided design to optimize the operational conditions of similar or super-size furnaces with confidence. Finally, a case study of CFD-aided design was carried out in the third series of CFD simulations of the heat transfer process inside the super-size furnace chamber. CFD simulations were used to verify if six SET burners are sufficient to provide the required temperature distribution inside the chamber and provide optimum locations for the SET burners.
Download or read book CFD Prediction of Coupled Radiation Heat Transfer and Soot Production in Turbulent Flames written by and published by . This book was released on 1906 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanisms governing the formation and destruction of soot in turbulent combustion are intimately coupled to thermal radiation due to the strong dependence of sooting processes and radiative loss on temperature. Detailed computational fluid dynamics (CFD) predictions of the radiative and soot output from turbulent non-premixed flames are normally performed by parabolic algorithms. However, the modelling of combustion systems, such as furnaces and unwanted enclosure fires, often require a fully elliptic description of the flow field and its related physical phenomena. Thus, this thesis investigates the intimate coupling between radiative energy exchange and the mechanisms governing soot formation and destruction within a three-dimensional, general curvilinear CFD code. Thermal radiation is modelled by the discrete transfer radiation model (DTRM). Special emphasis is given to approximate solutions to the radiative transfer equation encompassing various models for the radiative properties of gases and soot. A new algorithm is presented, entitled the differential total absorptivity (DTA) solution, which, unlike alternative solutions, incorporates the source temperature dependence of absorption. Additionally, a weighted sum of gray gases (WSGG) solution is described which includes the treatment of gray boundaries. Whilst the DTA solution is particularly recommended for systems comprising large temperature differences, the WSGG solution is deemed most appropriate for numerical simulation of lower temperature diffusion flames, due to its significant time advantage. The coupling between radiative loss and soot concentration is investigated via a multiple laminar flamelet concept applied within the CFD simulation of confined turbulent diffusion flames burning methane in air at 1 and 3 atm. Flamelet families are employed relating individual sooting mechanisms to the level of radiative loss, which is evaluated by the DTRM formulated for emitting-absorbing mixtures of soot,
Author : Michael F. Modest
Publisher : McGraw-Hill Science, Engineering & Mathematics
ISBN 13 : 9780070426757
Total Pages : 0 pages
Book Rating : 4.4/5 (267 download)
Download or read book Radiative Heat Transfer written by Michael F. Modest and published by McGraw-Hill Science, Engineering & Mathematics. This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers a comprehensive treatment of heat transfer. In addition to the standard topics usually covered, it also includes a number of modern state-of-the-art topics including: radiative properties of particles, generation of P-N approximation and collimated irradiation.
Author : Zied Driss
Publisher : Springer
ISBN 13 : 3319709453
Total Pages : 208 pages
Book Rating : 4.3/5 (197 download)
Download or read book CFD Techniques and Thermo-Mechanics Applications written by Zied Driss and published by Springer. This book was released on 2018-02-05 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on CFD (Computational Fluid Dynamics) techniques and the recent developments and research works in thermo-mechanics applications. It is devoted to the publication of basic and applied studies broadly related to this area. The chapters present the development of numerical methods, computational techniques, and case studies in the thermo-mechanics applications. They offer the fundamental knowledge for using CFD in real thermo-mechanics applications and complex flow problems through new technical approaches. Also, they discuss the steps in the CFD process and provide benefits and issues when using the CFD analysis in understanding of complicated flow phenomena and its use in the design process. The best practices for reducing errors and uncertainties in CFD analysis are also discussed. The presented case studies and development approaches aim to provide the readers, such as engineers and PhD students, the fundamentals of CFD prior to embarking on any real simulation project. Additionally, engineers supporting or being supported by CFD analysts can benefit from this book.
Author : Jr., Charles E. Baukal
Publisher : CRC Press
ISBN 13 : 9780203912782
Total Pages : 920 pages
Book Rating : 4.9/5 (127 download)
Download or read book Industrial Combustion Pollution and Control written by Jr., Charles E. Baukal and published by CRC Press. This book was released on 2003-10-15 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference overflows with an abundance of experimental techniques, simulation strategies, and practical applications useful in the control of pollutants generated by combustion processes in the metals, minerals, chemical, petrochemical, waste, incineration, paper, glass, and foods industries. The book assists engineers as they attempt to meet e
Author :
Publisher :
ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
