Download or read book Computational and Experimental Investigation of Flow and Combustion Physics in Porous Media written by Sadaf Sobhani and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As emission regulations become increasingly more stringent and policies evolve to combat global climate change impacts, reducing pollutant and greenhouse gas emissions emerge as one of the most important goals of combustion research. Techniques such as staged combustion, lean premixed combustion, catalytic combustion, and advanced mixing and fuel atomization are some of the methods examined to reduce emissions of pollutants such as nitrogen oxides (NOx), carbon monoxide (CO), and unburned hydrocarbons (UHCs). Porous media combustion represents an advanced combustion concept that is capable of achieving low emissions, enhanced flame stabilization, and improved fuel efficiency. Conventionally, Porous Media Burners (PMBs) utilize a two-zone ``step" burner design, which operates on the principal that the upstream high pore-density region serves as a flame arrestor and flame stability is observed at the interface between the two regions of high and low pore density. This dissertation contributes to the analysis of combustion in porous media, characterization of its performance in conventional PMBs, and the development and testing of a novel porous matrix design for enhanced combustion performance. First, a characterization of the combustion stability, pressure drop and pollutant emissions of conventional two-zone ``step" PMB is presented for a range of operating conditions and burner designs. Long-term material durability tests at steady-state and cycled on-off conditions were performed under operation with methane-fuel at atmospheric pressure. Thermocouple temperature measurements and pressure drop data are presented and compared to results obtained from 1D volume-averaged simulations. Additionally, the burner design with the maximum combustion stability regime was identified and tested in subsequent high-pressure experiments at 2, 8, and 20 bar with fully vaporized and preheated n-heptane and methane fuels, at fuel-lean equivalence ratios. Second, in an effort to expand the combustion stability regime beyond the capability of two-zone ``step" PMBs, a novel burner design having a spatially graded porous matrix is proposed, resulting from the theoretical analysis of the governing equations and constitutive relations. This analysis reveals the significance of the pore topology on interphase heat exchange and radiative heat transfer properties, quantified by the local Stanton number and optical depth, respectively. Gradation in topology (i.e. porosity, pore diameter, cell diameter, etc.) enables the flame to stabilize dynamically within the porous matrix and for a wider range of operating conditions. Computational stability maps, temperature profiles, and emissions data are presented for comparable two-zone ``step'' and ``graded" burner concepts, which predict significant performance enhancements in the latter. The theoretical and computational investigation of matrix gradation in PMBs as well as experiments reveal the potential for tailoring the internal heat transfer properties to optimize performance, and thus motivates the subsequent work in leveraging recent advancements in additive manufacturing to enable smoothly graded porous structures. The next part of this dissertation achieves the use of Lithography-based Ceramic Manufacturing for the fabrication of functionally graded matrix structures, designed using periodic surface equations. The manufactured samples were operated in a PMB over a range of operating conditions to test the feasibility and performance of additive manufactured materials in PMBs. Thermal and durability testing of the manufactured parts are characterized, along with combustion stability maps from the ``step" and ``graded" PMB experiment, which, consistent with the previous theoretical, computational, and experimental results, show significant performance improvements of the ``graded" burner.
Download or read book Experimental Investigation of Two Phase Flow in Porous Media effects of Surfactants on Immiscible Displacement Processes at the Pore Network Scale written by Yanping Ren and published by . This book was released on 2004 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lattice Boltzmann Modeling of Complex Flows for Engineering Applications written by Andrea Montessori and published by Morgan & Claypool Publishers. This book was released on 2018-02-20 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nature continuously presents a huge number of complex and multi-scale phenomena, which in many cases, involve the presence of one or more fluids flowing, merging and evolving around us. Since its appearance on the surface of Earth, Mankind has tried to exploit and tame fluids for their purposes, probably starting with Hero's machinery to open the doors of the Temple of Serapis in Alexandria to arrive to modern propulsion systems and actuators. Today we know that fluid mechanics lies at the basis of countless scientific and technical applications from the smallest physical scales (nanofluidics, bacterial motility, and diffusive flows in porous media), to the largest (from energy production in power plants to oceanography and meteorology). It is essential to deepen the understanding of fluid behaviour across scales for the progress of Mankind and for a more sustainable and efficient future. Since the very first years of the Third Millennium, the Lattice Boltzmann Method (LBM) has seen an exponential growth of applications, especially in the fields connected with the simulation of complex and soft matter flows. LBM, in fact, has shown a remarkable versatility in different fields of applications from nanoactive materials, free surface flows, and multiphase and reactive flows to the simulation of the processes inside engines and fluid machinery. LBM is based on an optimized formulation of Boltzmann's Kinetic Equation, which allows for the simulation of fluid particles, or rather quasi-particles, from a mesoscopic point of view thus allowing the inclusion of more fundamental physical interactions in respect to the standard schemes adopted with Navier-Stokes solvers, based on the continuum assumption. In this book, the authors present the most recent advances of the application of the LBM to complex flow phenomena of scientific and technical interest with particular focus on the multi-scale modeling of heterogeneous catalysis within nano-porous media and multiphase, multicomponent flows.
Download or read book An Experimental Numerical and CFD Investigation Into the Heat Transfer and Flow Characteristics in Porous Media Using a Thermal Non Equilibrium Model written by and published by . This book was released on 2005 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat transfer and fluid flow through porous media was investigated using numerical simulations and experiment. For the numerical simulations, two models were created. The first consisted of a two-dimensional numerical model created in MathCAD and was solved using the finite difference approach. The MathCAD model's flow in the porous media was described by the Brinkman-Forchheimer-extended Darcy equation. The second model consisted of a computational fluid dynamics (CFD) porous media model using Fluent and was solved using the finite volume approach. Both models assumed constant fluid phase and properties. Pore diameters were held constant for each simulation; two different porosities were investigated. Boundary conditions were applied at the wall in which the temperatures of the fluid and the porous media were determined by coupled energy equations. The effects of the boundary condition, the Reynolds number, porosity, and heat input were examined.
Download or read book Computational and Experimental Investigation of Lid Driven Cavity Flows written by Anne M. Grillet and published by . This book was released on 1998 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimentation Modeling and Computation in Flow Turbulence and Combustion written by Jean-Antoine Désidéri and published by . This book was released on 1996 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 2 of this significant work presents previously unpublished cutting-edge lectures from the Third French-Russian Workshop on Fluid Dynamics held in Tashkent in April 1995. Reflecting the Workshop?s main themes, this book particularly focuses on: expermental investigation of unsteady separated flow, 3D configurations, laminar and transitional flows, turbulent shock, shock interaction in hypersonic flow, pressure pulsation in separated flows and jets and high enthalpy flows using wind tunnels. modeling of free surface flows, natural gas combustion, vortical gas flows and acoustic processes in complex channels, non-equilibrium hypersonic viscous flows, wall law for fluids and compressible fluid jets with vortex zones. theoretical predictions of aerodynamic performances with analyses of supersonic combustion, detonation, and sumulation of reactive mixing layer. solution methods for quasilinear parabolic equations and other calculations including incompressible Navier Stokes equations and parabolic equations by Monte-Carlo methods. numerical algorithms for the simulation of atmospheric gas dynamics, kinetic schemes for viscous gas dynamic flows and evolutionary algorithms for complex optimization problems. This book will be of particular interest to all engineers and research scientists in Fluid Dynamics, Aeronautics, Aerospace and Mechanical or Applied Mathematics.
Download or read book Transport Phenomena in Porous Media III written by Derek B Ingham and published by Elsevier. This book was released on 2005-07-29 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid and flow problems in porous media have attracted the attention of industrialists, engineers and scientists from varying disciplines, such as chemical, environmental, and mechanical engineering, geothermal physics and food science. There has been a increasing interest in heat and fluid flows through porous media, making this book a timely and appropriate resource.Each chapter is systematically detailed to be easily grasped by a research worker with basic knowledge of fluid mechanics, heat transfer and computational and experimental methods. At the same time, the readers will be informed of the most recent research literature in the field, giving it dual usage as both a post-grad text book and professional reference.Written by the recent directors of the NATO Advanced Study Institute session on 'Emerging Technologies and Techniques in Porous Media' (June 2003), this book is a timely and essential reference for scientists and engineers within a variety of fields.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Air Injection in Saturated Unconsolidated Porous Media written by Xiang-Zhao Kong and published by . This book was released on 2010 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Computational Evaluation of Flow Through Porous Media written by Dimpho Millicent Mothibi and published by LAP Lambert Academic Publishing. This book was released on 2011-08 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The understanding and quantitative description of fluid flow through porous media, is a science which has been going on for many years and investigated in a variety of disciplines. Studies in this field have primarily been based on models, which can either be described as empirical or theoretical. Part of the current study is to understand fluid flow in porous media through studying three recent theoretical pore-scale models based on the concept of a Representative Unit Cell (RUC), to represent a porous medium. Amongst other assumptions, these models assumed plane Poiseuille flow throughout each pore section of a rectangular RUC. The main objective of this study is to numerically verify this assumption using Computational Fluid Dynamics (CFD) software, FLUENT version 6.2.16. Attention is also paid to comparison between these models with the experimental data, obtained during the model tests of airflow through a timber stack end, undertaken in a wind tunnel. The laminar and intermediate airflow through a timber stack end is simulated using the commercial software FLUENT, and the results are validated against the theoretical pore-scale models and experimental data.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Porous Media written by Kambiz Vafai and published by CRC Press. This book was released on 2005-03-30 with total page 771 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last three decades, advances in modeling flow, heat, and mass transfer through a porous medium have dramatically transformed engineering applications. Comprehensive and cohesive, Handbook of Porous Media, Second Edition presents a compilation of research related to heat and mass transfer including the development of practical applications
Download or read book Essentials of Heat and Fluid Flow in Porous Media written by Arunn Narasimhan and published by Springer. This book was released on 2022-07-09 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides a general overview of porous media flow, and introduces various theoretical tools to characterize and predict the flow. It has been written for graduate and advanced graduate students in various engineering disciplines. It includes the topics such as fluid flow, conduction, convection, and radiation in porous media as well as porous medium aspects of biological systems. The concepts are supported by numerous solved examples to aid self-learning in students. The textbook also contains illustrated diagrams for better understanding of the concepts. This textbook will be useful for the core course of "Flow through Porous media" for graduate and advanced graduate students in various engineering disciplines. This textbook will also serve as a refresher course for researchers who are engaged in research related to porous media flow.
Download or read book Convective Heat Transfer in Porous Media written by Yasser Mahmoudi and published by CRC Press. This book was released on 2019-11-06 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on heat transfer in porous media, this book covers recent advances in nano and macro’ scales. Apart from introducing heat flux bifurcation and splitting within porous media, it highlights two-phase flow, nanofluids, wicking, and convection in bi-disperse porous media. New methods in modeling heat and transport in porous media, such as pore-scale analysis and Lattice–Boltzmann methods, are introduced. The book covers related engineering applications, such as enhanced geothermal systems, porous burners, solar systems, transpiration cooling in aerospace, heat transfer enhancement and electronic cooling, drying and soil evaporation, foam heat exchangers, and polymer-electrolyte fuel cells.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Computational and Experimental Simulations in Engineering written by Hiroshi Okada and published by Springer Nature. This book was released on 2019-11-16 with total page 1278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the latest advances, innovations, and applications in the field of computational engineering, as presented by leading international researchers and engineers at the 24th International Conference on Computational & Experimental Engineering and Sciences (ICCES), held in Tokyo, Japan on March 25-28, 2019. ICCES covers all aspects of applied sciences and engineering: theoretical, analytical, computational, and experimental studies and solutions of problems in the physical, chemical, biological, mechanical, electrical, and mathematical sciences. As such, the book discusses highly diverse topics, including composites; bioengineering & biomechanics; geotechnical engineering; offshore & arctic engineering; multi-scale & multi-physics fluid engineering; structural integrity & longevity; materials design & simulation; and computer modeling methods in engineering. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaborations.
Download or read book A Theoretical and Experimental Investigation of Pulsed Pressure gain Combustion written by Mohamed El-Sayed Marzouk and published by . This book was released on 1974 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
