Download or read book Multiscale Simulation of Transport Phenomena in Semi solid Flow Batteries written by Stephen Anthony Burrows and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamental Studies on Transport Phenomena in Redox Flow Batteries with Flow Field Structures and Slurry Or Semi Solid Electrodes written by Xinyou Ke and published by . This book was released on 2019 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Redox flow batteries with flow field designs have been demonstrated to boost their capacities to deliver high current density in medium and large-scale energy storage applications. Nevertheless, the fundamental mechanisms involved with improved current density in flow batteries with serpentine flow field designs have been not fully understood. In this dissertation work, one-dimensional (1D) analytical model, two-dimensional (2D) numerical model with scaling analysis, and three-dimensional (3D) model of a serpentine flow field over the porous carbon paper electrodes have been developed to examine the distributions and amounts of pressure driven electrolyte flow penetrations into the porous carbon paper electrodes. It was found that the electrolyte flow penetrations are strongly under-estimated by 1D analytical model and 2D numerical model. The scaling analysis also demonstrates that the flow penetrations enhanced by the adjacent flow channels are significant, and were not able to be incorporated in the 1D and 2D models. The 3D model accounts the effects of landings/ribs bridged between the adjacent flow channels on flow penetrations and better calculates the amount of flow penetrations into the porous carbon paper electrodes. It was also found that the flow penetrations are sensitive to the properties of the porous electrode, i.e. permeability and porosity, a smaller permeability or porosity results in a much smaller flow penetration. The model is used to estimate the maximum current densities associated with the stoichiometric availability of electrolyte reactant flow penetrations through the porous carbon paper electrodes. The modeling results match reasonably well observed experimental data without using any adjustable parameters. This fundamental work on electrolyte flow distributions of limiting reactant availability will contribute to a better understanding of limits on electrochemical performance in flow batteries with serpentine flow field designs and should be helpful to optimize flow batteries. Slurry or semi-solid electrodes are being developed for electrochemical flow capacitors and flow batteries to decouple power and energy. The utilization of slurry electrodes is a critical issue. The electronic conductivity of slurry electrodes is considered the most significant factor to determine the utilization of slurry electrodes and consequently affect the electrochemical performance. However, understanding fundamentals related to the electronic conductivity of slurry electrodes is quite limited and especially from the aspect of theory. The existing theories, i.e. effective medium theory and percolation theory, are inadequate for predicting electronic conductivity. These two theories do not consider the particle aggregations from the aspect of particle-to-particle interactions. Thus, an understanding of particle aggregations based on particle dynamics for understanding electronic conductivity is desired. By making force scaling analysis, it was found that the Brownian, Van der Waals attractive, electrostatic repulsive and electric forces are dominant in the particle dynamics of nano-scale particles. While, for the micro-scale particles, viscous, inertia, gravitational, buoyant and electric forces are dominant. It was also preliminarily found that the particle aggregations may be related to the conduction paths and consequently affect the electronic conductivity. Also, a novel design was developed to examine the electronic conductivity. Future work should focus on correlating the particle interactions for inducing conduction paths with the electronic conductivities of slurry or semi-solid electrodes.
Download or read book Pore scale Modeling of Transport Phenomena in Vanadium Redox Flow Batteries written by Gang Qiu and published by . This book was released on 2012 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adviser: Ying Sun.
Download or read book Multiscale Capabilities for Exploring Transport Phenomena in Batteries written by and published by . This book was released on 2013 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have began the project "Multiscale Capability for Exploring Transport Phenomena in Battery", which is sponsored by Laboratory Directed Research and Development Program at Lawrence Livermore National Laboratory in February 2012 as the subcontract was approved. We have been performing first-principles quantum-mechanical calculations to first establish the general modeling framework. It was found that it is essential to employ advanced Density Functional Theory (DFT) calculations with Hubbard U correction, in order to describe the battery material, in particular, LiFePO4 (Figure 1). The presence of localized d-electrons at Fe ion sites requires the better treatment of non-local correlation beyond that of standard DFT. As our aim was to first identify and investigate key transport/reaction mechanisms affecting the performance of Lithium-ion based batteries, we have began out work by characterizing the standard structures and how the defects influence the important electronic structure.
Download or read book Multiscale Modelling and Simulation of Flow Batteries written by T.S. Zhao and published by Academic Press. This book was released on 2022-11-15 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiscale Modelling and Simulation of Flow Batteries provides an in-depth understanding of the flow battery renewable energy storage devices most suitable for large-scale stationary energy storage and the optimization of its performance at microscopic, mesoscopic, and macroscopic levels. A comprehensive description of multiscale modeling and simulation strategies in flow batteries with a critical review of the advances in this rapidly developing field in self-contained chapters for those interested in different modeling approaches. Designed in sections according to the required accuracy, available computational capacity, and interested battery metrics, this reference features a tutorial on modeling macroscopic battery performance with the step-by-step settings and sample programming flowchart. With all aspects of flow battery modeling and multiscale modeling strategies and simulations, from the kinetics of active species to whole battery performance, this book is beneficial to researchers majoring in engineering and a modeling paradigm for those working on other electrochemical systems. Uniquely offers tutorial on modeling macroscopic battery performance using commercial software Includes source code for mesoscopic simulation of electrolyte flows in the porous electrode Examples input script to calculate microscopic kinetics of active species using open-source software
Download or read book Transport Phenomena in Miniaturized Redox Flow Batteries with Novel Flow Mixing and Guidance Concepts for Integrated Electronic Chip Cooling and Powering written by Julian A. Marschewski and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogen Batteries and Fuel Cells written by Bengt Sundén and published by Academic Press. This book was released on 2019-07-02 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrogen, Batteries and Fuel Cells provides the science necessary to understand these important areas, considering theory and practice, practical problem-solving, descriptions of bottlenecks, and future energy system applications. The title covers hydrogen as an energy carrier, including its production and storage; the application and analysis of electrochemical devices, such as batteries, fuel cells and electrolyzers; and the modeling and thermal management of momentum, heat, mass and charge transport phenomena. This book offers fundamental and integrated coverage on these topics that is critical to the development of future energy systems. Combines coverage of hydrogen, batteries and fuel cells in the context of future energy systems Provides the fundamental science needed to understand future energy systems in theory and practice Gives examples of problems and solutions in the use of hydrogen, batteries and fuel cells Considers basic issues in understanding hydrogen and electrochemical devices Describes methods for modeling and thermal management in future energy systems
Download or read book Mechanical Behavior of Materials written by William F. Hosford and published by Cambridge University Press. This book was released on 2010 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a textbook on the mechanical behavior of materials for mechanical and materials engineering. It emphasizes quantitative problem solving. This new edition includes treatment of the effects of texture on properties and microstructure in Chapter 7, a new chapter (12) on discontinuous and inhomogeneous deformation, and treatment of foams in Chapter 21.
Download or read book Multiscale Modelling and Simulation written by Sabine Attinger and published by Springer Science & Business Media. This book was released on 2004-07-12 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: In August 2003, ETHZ Computational Laboratory (CoLab), together with the Swiss Center for Scientific Computing in Manno and the Università della Svizzera Italiana (USI), organized the Summer School in "Multiscale Modelling and Simulation" in Lugano, Switzerland. This summer school brought together experts in different disciplines to exchange ideas on how to link methodologies on different scales. Relevant examples of practical interest include: structural analysis of materials, flow through porous media, turbulent transport in high Reynolds number flows, large-scale molecular dynamic simulations, ab-initio physics and chemistry, and a multitude of others. Though multiple scale models are not new, the topic has recently taken on a new sense of urgency. A number of hybrid approaches are now created in which ideas coming from distinct disciplines or modelling approaches are unified to produce new and computationally efficient techniques.
Download or read book Advanced Transport Phenomena written by P. A. Ramachandran and published by Cambridge University Press. This book was released on 2014-09-25 with total page 805 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated, modern approach to transport phenomena for graduate students, featuring examples and computational solutions to develop practical problem-solving skills.
Download or read book Porous Media written by F. A.L. Dullien and published by Academic Press. This book was released on 2012-12-02 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the relationship between transport properties and pore structure of porous material. Models of pore structure are presented with a discussion of how such models can be used to predict the transport properties of porous media. Portions of the book are devoted to interpretations of experimental results in this area and directions for future research. Practical applications are given where applicable, and are expected to be useful for a large number of different fields, including reservoir engineering, geology, hydrogeology, soil science, chemical process engineering, biomedical engineering, fuel technology, hydrometallurgy, nuclear reactor technology, and materials science. Presents mechanisms of immiscible and miscible displacement (hydrodynamic dispersion) process in porous media Examines relationships between pore structure and fluid transport Considers approaches to enhanced oil recovery Explores network modeling and perolation theory
Download or read book Transport Phenomena in Multiphase Systems written by Amir Faghri and published by Academic Press. This book was released on 2006 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering students in a wide variety of engineering disciplines from mechanical and chemical to biomedical and materials engineering must master the principles of transport phenomena as an essential tool in analyzing and designing any system or systems wherein momentum, heat and mass are transferred. This textbook was developed to address that need, with a clear presentation of the fundamentals, ample problem sets to reinforce that knowledge, and tangible examples of how this knowledge is put to use in engineering design. Professional engineers, too, will find this book invaluable as reference for everything from heat exchanger design to chemical processing system design and more. * Develops an understanding of the thermal and physical behavior of multiphase systems with phase change, including microscale and porosity, for practical applications in heat transfer, bioengineering, materials science, nuclear engineering, environmental engineering, process engineering, biotechnology and nanotechnology * Brings all three forms of phase change, i.e., liquid vapor, solid liquid and solid vapor, into one volume and describes them from one perspective in the context of fundamental treatment * Presents the generalized integral and differential transport phenomena equations for multi-component multiphase systems in local instance as well as averaging formulations. The molecular approach is also discussed with the connection between microscopic and molecular approaches * Presents basic principles of analyzing transport phenomena in multiphase systems with emphasis on melting, solidification, sublimation, vapor deposition, condensation, evaporation, boiling and two-phase flow heat transfer at the micro and macro levels * Solid/liquid/vapor interfacial phenomena, including the concepts of surface tension, wetting phenomena, disjoining pressure, contact angle, thin films and capillary phenomena, including interfacial balances for mass, species, momentum, and energy for multi-component and multiphase interfaces are discussed * Ample examples and end-of-chapter problems, with Solutions Manual and PowerPoint presentation available to the instructors
Download or read book Theory and Modeling of Polymer Nanocomposites written by Valeriy V. Ginzburg and published by Springer Nature. This book was released on 2020-12-16 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume brings together the state of the art in polymer nanocomposite theory and modeling, creating a roadmap for scientists and engineers seeking to design new advanced materials. The book opens with a review of molecular and mesoscale models predicting equilibrium and non-equilibrium nanoscale structure of hybrid materials as a function of composition and, especially, filler types. Subsequent chapters cover the methods and analyses used for describing the dynamics of nanocomposites and their mechanical and physical properties. Dedicated chapters present best practices for predicting materials properties of practical interest, including thermal and electrical conductivity, optical properties, barrier properties, and flammability. Each chapter is written by leading academic and industrial scientists working in each respective sub-field. The overview of modeling methodology combined with detailed examples of property predictions for specific systems will make this book useful for academic and industrial practitioners alike.
Download or read book SOFC Modelling and Parameter Identification by Means of Impedance Spectroscopy written by André Leonide and published by KIT Scientific Publishing. This book was released on 2010 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high resolution electrochemical impedance spectroscopy study on anode supported single cells (ASC) is presented. The cells were characterised over a broad range of operating conditions, including different temperatures, current densities and various cathode and anode gas compositions.The analysis of the distribution of relaxation times combined with the numeric accuracy of a CNLS fit enabled the identification of five different processes contributing to the total polarisation loss of an ASC.
Download or read book Classical And Quantum Dynamics In Condensed Phase Simulations Proceedings Of The International School Of Physics written by Bruce J Berne and published by World Scientific. This book was released on 1998-06-17 with total page 881 pages. Available in PDF, EPUB and Kindle. Book excerpt: The school held at Villa Marigola, Lerici, Italy, in July 1997 was very much an educational experiment aimed not just at teaching a new generation of students the latest developments in computer simulation methods and theory, but also at bringing together researchers from the condensed matter computer simulation community, the biophysical chemistry community and the quantum dynamics community to confront the shared problem: the development of methods to treat the dynamics of quantum condensed phase systems.This volume collects the lectures delivered there. Due to the focus of the school, the contributions divide along natural lines into two broad groups: (1) the most sophisticated forms of the art of computer simulation, including biased phase space sampling schemes, methods which address the multiplicity of time scales in condensed phase problems, and static equilibrium methods for treating quantum systems; (2) the contributions on quantum dynamics, including methods for mixing quantum and classical dynamics in condensed phase simulations and methods capable of treating all degrees of freedom quantum-mechanically.
Download or read book Mathematical Modeling of Lithium Batteries written by Krishnan S. Hariharan and published by Springer. This book was released on 2017-12-28 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is unique to be the only one completely dedicated for battery modeling for all components of battery management system (BMS) applications. The contents of this book compliment the multitude of research publications in this domain by providing coherent fundamentals. An explosive market of Li ion batteries has led to aggressive demand for mathematical models for battery management systems (BMS). Researchers from multi-various backgrounds contribute from their respective background, leading to a lateral growth. Risk of this runaway situation is that researchers tend to use an existing method or algorithm without in depth knowledge of the cohesive fundamentals—often misinterpreting the outcome. It is worthy to note that the guiding principles are similar and the lack of clarity impedes a significant advancement. A repeat or even a synopsis of all the applications of battery modeling albeit redundant, would hence be a mammoth task, and cannot be done in a single offering. The authors believe that a pivotal contribution can be made by explaining the fundamentals in a coherent manner. Such an offering would enable researchers from multiple domains appreciate the bedrock principles and forward the frontier. Battery is an electrochemical system, and any level of understanding cannot ellipse this premise. The common thread that needs to run across—from detailed electrochemical models to algorithms used for real time estimation on a microchip—is that it be physics based. Build on this theme, this book has three parts. Each part starts with developing a framework—often invoking basic principles of thermodynamics or transport phenomena—and ends with certain verified real time applications. The first part deals with electrochemical modeling and the second with model order reduction. Objective of a BMS is estimation of state and health, and the third part is dedicated for that. Rules for state observers are derived from a generic Bayesian framework, and health estimation is pursued using machine learning (ML) tools. A distinct component of this book is thorough derivations of the learning rules for the novel ML algorithms. Given the large-scale application of ML in various domains, this segment can be relevant to researchers outside BMS domain as well. The authors hope this offering would satisfy a practicing engineer with a basic perspective, and a budding researcher with essential tools on a comprehensive understanding of BMS models.
Download or read book Gas Transport in Porous Media written by Clifford K. Ho and published by Springer Science & Business Media. This book was released on 2006-10-07 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: CLIFFORD K. HOAND STEPHEN W. WEBB Sandia National Laboratories, P. O. Box 5800, Albuquerque, NM 87185, USA Gas and vapor transport in porous media occur in a number of important applications includingdryingofindustrialandfoodproducts,oilandgasexploration,environm- tal remediation of contaminated sites, and carbon sequestration. Understanding the fundamental mechanisms and processes of gas and vapor transport in porous media allows models to be used to evaluate and optimize the performance and design of these systems. In this book, gas and vapor are distinguished by their available states at stan- ? dard temperature and pressure (20 C, 101 kPa). If the gas-phase constituent can also exist as a liquid phase at standard temperature and pressure (e. g. , water, ethanol, toluene, trichlorothylene), it is considered a vapor. If the gas-phase constituent is non-condensable at standard temperature and pressure (e. g. , oxygen, carbon di- ide, helium, hydrogen, propane), it is considered a gas. The distinction is important because different processes affect the transport and behavior of gases and vapors in porous media. For example, mechanisms specific to vapors include vapor-pressure lowering and enhanced vapor diffusion, which are caused by the presence of a g- phase constituent interacting with its liquid phase in an unsaturated porous media. In addition, the “heat-pipe” exploits isothermal latent heat exchange during evaporation and condensation to effectively transfer heat in designed and natural systems.
