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Towards A Predictive Model To Reproduce Flow Regime Transitions In Gas Liquid Flows With Neptune Cfd
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Book Synopsis Towards a Predictive Model to Reproduce Flow Regime Transitions in Gas-liquid Flows with Neptune CFD by : Emmanuel Vianney Kuidjo Kuidjo
Download or read book Towards a Predictive Model to Reproduce Flow Regime Transitions in Gas-liquid Flows with Neptune CFD written by Emmanuel Vianney Kuidjo Kuidjo and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In nuclear reactors, several regimes of gas-liquid flows may occur with some transitions between them. The main challenges associated with simulating these transitions in 3D CFD codes are associated with deformable interfaces of different sizes, accounting for coalescence and breakup interactions between gas structures and developing flow regime independent closure relations. This work aims at modelling and simulating the hydrodynamics of adiabatic gas-liquid flows thanks to a three-field two-fluid model in Neptune CFD. In a first step, a model with one continuous liquid field and two dispersed gas fields for small and large bubbles is used to simulate cap and churn flows with a void fraction up to 0.5 and a focus is put on the interfacial area prediction. In a second step, the second dispersed field is replaced by a hybrid continuous/dispersed field representing both large bubbles and continuous gas regions. The model is validated on several flow regimes in large diameter pipes and in confined rectangular channels.
Book Synopsis Flow Regime Transitions in Horizontal Gas-liquid Flow by : Pui-Yan Lin
Download or read book Flow Regime Transitions in Horizontal Gas-liquid Flow written by Pui-Yan Lin and published by . This book was released on 1985 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Modeling For Computational Fluid Dynamics: Construction And Application Of Unified Gas-kinetic Schemes by : Kun Xu
Download or read book Direct Modeling For Computational Fluid Dynamics: Construction And Application Of Unified Gas-kinetic Schemes written by Kun Xu and published by World Scientific. This book was released on 2014-12-23 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational fluid dynamics (CFD) studies the flow motion in a discretized space. Its basic scale resolved is the mesh size and time step. The CFD algorithm can be constructed through a direct modeling of flow motion in such a space. This book presents the principle of direct modeling for the CFD algorithm development, and the construction unified gas-kinetic scheme (UGKS). The UGKS accurately captures the gas evolution from rarefied to continuum flows. Numerically it provides a continuous spectrum of governing equation in the whole flow regimes.
Book Synopsis Coupled CFD-DEM Modeling by : Hamid Reza Norouzi
Download or read book Coupled CFD-DEM Modeling written by Hamid Reza Norouzi and published by John Wiley & Sons. This book was released on 2016-10-21 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the CFD-DEM method of modeling which combines both the Discrete Element Method and Computational Fluid Dynamics to simulate fluid-particle interactions. Deals with both theoretical and practical concepts of CFD-DEM, its numerical implementation accompanied by a hands-on numerical code in FORTRAN Gives examples of industrial applications
Book Synopsis Prediction of Turbulent Flows by : Geoff Hewitt
Download or read book Prediction of Turbulent Flows written by Geoff Hewitt and published by Cambridge University Press. This book was released on 2005-06-08 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prediction of turbulent flows is of paramount importance in the development of complex engineering systems involving flow, heat and mass transfer, and chemical reactions. Arising from a programme held at the Isaac Newton Institute in Cambridge, this volume reviews the current situation regarding the prediction of such flows through the use of modern computational fluid dynamics techniques, and attempts to address the inherent problem of modelling turbulence. In particular, the current physical understanding of such flows is summarised and the resulting implications for simulation discussed. The volume continues by surveying current approximation methods whilst discussing their applicability to industrial problems. This major work concludes by providing a specific set of guidelines for selecting the most appropriate model for a given problem. Unique in its breadth and critical approach, this book will be of immense value to experienced practitioners and researchers, continuing the UK's strong tradition in fluid dynamics.
Book Synopsis Computational Techniques for Multiphase Flows by : Guan Heng Yeoh
Download or read book Computational Techniques for Multiphase Flows written by Guan Heng Yeoh and published by Elsevier. This book was released on 2009-10-07 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixed or multiphase flows of solid/liquid or solid/gas are commonly found in many industrial fields, and their behavior is complex and difficult to predict in many cases. The use of computational fluid dynamics (CFD) has emerged as a powerful tool for the understanding of fluid mechanics in multiphase reactors, which are widely used in the chemical, petroleum, mining, food, beverage and pharmaceutical industries. Computational Techniques for Multiphase Flows enables scientists and engineers to the undertand the basis and application of CFD in muliphase flow, explains how to use the technique, when to use it and how to interpret the results and apply them to improving aplications in process enginering and other multiphase application areas including the pumping, automotive and energy sectors. - Understandable guide to a complex subject - Important in many industries - Ideal for potential users of CFD
Book Synopsis Study of Flow Regime Transitions Using Experimental Data and CFD Codes by :
Download or read book Study of Flow Regime Transitions Using Experimental Data and CFD Codes written by and published by . This book was released on 2009 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Flow Regime Transitions for Oil-water-gas Mixtures in Large Diameter Horizontal Pipelines by : Ai Hsin Lee
Download or read book A Study of Flow Regime Transitions for Oil-water-gas Mixtures in Large Diameter Horizontal Pipelines written by Ai Hsin Lee and published by . This book was released on 1993 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis CFD Simulation of Two-phase Gas/non-newtonian Fluid Flows in Pipes by : Miguel Andrés Mauricio Daza Gómez
Download or read book CFD Simulation of Two-phase Gas/non-newtonian Fluid Flows in Pipes written by Miguel Andrés Mauricio Daza Gómez and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The multiphase flow has always been a major concern since it is encountered in many industrial processes that are crucial. Gas/non-Newtonian two-phase flow is found in the upstream of the petroleum industry, where slug flow is the most common flow pattern. This flow pattern has complex hydrodynamics which are crucial to study and evaluate. This study assessed the two-phase gas/non-Newtonian fluid flow in different configurations of pipes. The model was developed using Computational Fluid Dynamics (CFD) with an orthogonal mesh to evaluate the behavior of the slug dynamics in the different configurations. The model Volume of Fluid (VOF) was used to estimate and predict the most important parameters: pressure drop, slug frequency and length. First the model was validated with experimental data found in literature in a horizontal 9 m long glass pipe, with an inner diameter of 22.8 mm. The validation was made with CarboxyMethyl Cellulose CMC-water solutions as test fluids...
Book Synopsis The Study of Two-phase Flow for Crude Oil Production Using Computational Fluid Dynamics (CFD) by : Ahmad Amirhilmi A. Razak
Download or read book The Study of Two-phase Flow for Crude Oil Production Using Computational Fluid Dynamics (CFD) written by Ahmad Amirhilmi A. Razak and published by . This book was released on 2013 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling the liquid-gas phase flow inside the horizontal and inclined pipe using CFD analysis is difficult due to continuously changing flow patterns. The main objectives of this research are to investigate the flow pattern of liquid-gas phase inside the horizontal and inclined pipe. Two-phase flows specifically on the liquidgas flow have a complex flow pattern that can be observed by develop the 3- Dimensional model using the Computational Fluid Dynamic (CFD) software that consist of Gambit for develop the model of horizontal and inclined pipe and then transfer the data to Fluent for further analysis. The simulation was conducted by modelling the horizontal and inclined plane with the length of 7 m and 0.08 m of inner diameter. This simulation was carried out under adiabatic condition and operating at normal temperature which was 298 K. The gravity was enabled in order to differentiate the phase flow inside the horizontal and incline pipe due to the density of liquid-gas phases. The simulation was run using the Volume of Fluid (VOF) for the solver. The manipulated variables which were velocity of the liquid and gas are been changed in order to predict the various flow pattern for both horizontal and inclined pipe. The results of flow pattern are been analyzed and compared with the previous researchers' results. This can be concluded that all flow patterns appearing in the Baker chart can be simulated using existing CFD. In order to improve the effectiveness of the model developed, the simulation needed to be run until the iteration is converging.
Book Synopsis Mechanistic Modeling of Gas-liquid Two-phase Flow in Pipes by : Ovadia Shoham
Download or read book Mechanistic Modeling of Gas-liquid Two-phase Flow in Pipes written by Ovadia Shoham and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this book are twofold: to provide insight and understanding of two-phase flow phenomena and to develop analytical tools for either designing two-phase flow systems or conducting research in this area. The traditional approach for two-phase flow prediction was based on the development of an empirical correlation from experimental data. This book presents the recent approach, in which mathematical mechanistic models are developed, based on the physical phenomena, to predict two-phase flow behavior. The models can be verified and refined with limited experimental data. However, as these models incorporate the physical phenomena and the important flow variables, they can be extended to different operational conditions and can enable scaleup with significant confidence.
Book Synopsis Flow Regime Prediction in Two-phase (solid-liquid) Single-component Flow by : Phillip D. Fairchild
Download or read book Flow Regime Prediction in Two-phase (solid-liquid) Single-component Flow written by Phillip D. Fairchild and published by . This book was released on 1967 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mathematical Modeling of Disperse Two-Phase Flows by : Christophe Morel
Download or read book Mathematical Modeling of Disperse Two-Phase Flows written by Christophe Morel and published by Springer. This book was released on 2016-10-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book develops the theoretical foundations of disperse two-phase flows, which are characterized by the existence of bubbles, droplets or solid particles finely dispersed in a carrier fluid, which can be a liquid or a gas. Chapters clarify many difficult subjects, including modeling of the interfacial area concentration. Basic knowledge of the subjects treated in this book is essential to practitioners of Computational Fluid Dynamics for two-phase flows in a variety of industrial and environmental settings. The author provides a complete derivation of the basic equations, followed by more advanced subjects like turbulence equations for the two phases (continuous and disperse) and multi-size particulate flow modeling. As well as theoretical material, readers will discover chapters concerned with closure relations and numerical issues. Many physical models are presented, covering key subjects including heat and mass transfers between phases, interfacial forces and fluid particles coalescence and breakup, amongst others. This book is highly suitable for students in the subject area, but may also be a useful reference text for more advanced scientists and engineers.
Book Synopsis Computational Fluid Dynamics (CFD) Simulation of a Gas-Solid Fluidized Bed. Residence Time Validation Study by : Baru Debtera
Download or read book Computational Fluid Dynamics (CFD) Simulation of a Gas-Solid Fluidized Bed. Residence Time Validation Study written by Baru Debtera and published by . This book was released on 2021-11-05 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Academic Paper from the year 2021 in the subject Physics - Mechanics, language: English, abstract: In this study, numerical simulations of a gas-solid fluidized bed reactor involving a two-fluid Eulerian multiphase model and incorporating the Kinetic Theory of Granular Flow (KTGF) for the solids phase have been performed using a commercial Computational Fluid Dynamics (CFD) software. The fluidized bed setup consists of 1,5 m height and 0,2 m diameter in which a series of experiments were performed using Helium tracer to determine the Residence Time Distribution (RTD) at various normalized velocities i.e., with different degrees of gas-solids mixing. Both 2D and 3D simulations of the fluidized bed reactor are performed. The main purpose of this study is to understand the hydrodynamic behavior of a gas-solid fluidized bed reactor through a framework of Eulerian multiphase model and to analyze hydrodynamic behavior of the gas-solids mixing.
Book Synopsis Experimental and CFD Modelling of the Drift Flux in Two-phase Air-(non)Newtonian Slug-flow Pattern Flow Along Horizontal and Inclined Pipelines by : Paula Daniela Pico Viviescas
Download or read book Experimental and CFD Modelling of the Drift Flux in Two-phase Air-(non)Newtonian Slug-flow Pattern Flow Along Horizontal and Inclined Pipelines written by Paula Daniela Pico Viviescas and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study analyzes the influence of the physical properties of Newtonian and non-Newtonian fluids, such as density, effective viscosity and surface tension, as well as operational parameters of the piping, such as diameter, length and inclination angle on the drift velocity for two-phase gas-liquid flow. This study comprises experimental and Computational Fluid Dynamic (CFD) approaches. The simulation model was calibrated through a mesh independence test, which considered experimental and literature data as benchmark, and was divided in three sections based on the viscosity of the fluid and the positioning of the pipeline. The results obtained through the CFD model showed good agreement with the experimental data gathered for the present study, keeping the experimental deviations under 30% for all cases. The relationship between the Froude number (Fr) and Viscosity number (Nvis) was studied and an inverse exponential pattern was found for all the parameters and fluids tested. Additionally, the relation observed between Fr and Nvis for a horizontal setting on Newtonian fluids had good resemblance with the models proposed in literature, predicting accurately a decreasing behavior of the drift velocity for increasing viscosity. The data gathered for all fluids on the drift velocity's behavior against operational parameters showed the influence of the governing forces for each case based on a dimensionless analysis using Etvos (Eo) and Reynolds (Re) numbers. For dominant capillary or viscous forces, the drift velocity changed with the variation of these parameters. However, it was found that for dominant inertial and gravitational forces, the drift velocity maintained a constant value regardless of the operational settings. Finally, it was observed that the rheological nature of the non-Newtonian fluids has a significant influence on the drift velocity's behavior, deviating its patterns from the Newtonian fluids as the effective viscosity changes.
Book Synopsis Closure Strategies for Turbulent and Transitional Flows by : Brian Edward Launder
Download or read book Closure Strategies for Turbulent and Transitional Flows written by Brian Edward Launder and published by . This book was released on 2002 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence modelling is a critically important area in any industry dealing with fluid flow, having many implications for computational fluid dynamics (CFD) codes. It also retains a huge interest for applied mathematicians since there are many unsolved problems. This book provides a comprehensive account of the state-of-the-art in predicting turbulent and transitional flows by some of the world's leaders in these fields. It can serve as a graduate-level textbook and, equally, as a reference book for research workers in industry or academia. It is structured in three parts: Physical and Numerical Techniques; Flow Types and Processes; and Future Directions. As the only broad account of the subject, it will prove indispensable for all working in CFD, whether academics interested in turbulent flows, industrial researchers in CFD interested in understanding the models embedded in their software (or seeking more powerful models) or graduate students needing an introduction to this vital area.
Book Synopsis CFD Simulation of Gas-liquid Hydrodynamics in Aerated Stirred Tank by : Azri Abdullah
Download or read book CFD Simulation of Gas-liquid Hydrodynamics in Aerated Stirred Tank written by Azri Abdullah and published by . This book was released on 2010 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this work is to comparing the simulation result from Computational Fluid Dynamic (CFD) with the experimental measurement from Montante et al. (2007). Liquid axial velocity and liquid radial velocity were measured in order to get the similar result with experimental measurement from Montante et al. (2007). For this work, Gambit 2.4.6 and Fluent 6.3.26 software were use in modelling and running the simulation. The experimental results obtained at different gas flow rates are presented, compared with multi-phase data and discussed for gaining insight into the gas-liquid flows. The agreement between the experimental and the calculated mean velocity fields indicates that the selected CFD modelling is appropriate for the prediction of the mean hydrodynamic features of gas-liquid dispersions in stirred vessels.
