Direct Numerical Simulation Of Bubbly Flows

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Bubbly Flows

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Author : Martin Sommerfeld
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Bubbly Flows written by Martin Sommerfeld and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

The book summarises the outcom of a priority research programme: 'Analysis, Modelling and Computation of Multiphase Flows'. The results of 24 individual research projects are presented. The main objective of the research programme was to provide a better understanding of the physical basis for multiphase gas-liquid flows as they are found in numerous chemical and biochemical reactors. The research comprises steady and unsteady multiphase flows in three frequently found reactor configurations, namely bubble columns without interiors, airlift loop reactors, and aerated stirred vessels. For this purpose new and improved measurement techniques were developed. From the resulting knowledge and data, new and refined models for describing the underlying physical processes were developed, which were used for the establishment and improvement of analytic as well as numerical methods for predicting multiphase reactors. Thereby, the development, lay-out and scale-up of such processes should be possible on a more reliable basis.

Direct Numerical Simulation Of Bubbly Flows

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Author : Aurore Loisy
language : en
Publisher:
Release Date : 2016

Direct Numerical Simulation Of Bubbly Flows written by Aurore Loisy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

This thesis is devoted to the study of homogeneous bubbly flows and their coupling with scalar transport and turbulence. It focuses on the effects of finite size, hydrodynamic interactions, and suspension microstructure, which are investigated using direct numerical simulations at the bubble scale. The dynamics of laminar buoyancy-driven bubbly suspensions is first revisited. More specifically, the effect of volume fraction on the bubble drift velocity is clarified by connecting numerical results to theory for dilute ordered systems, and similarities between perfectly ordered and free disordered suspensions are evidenced. These results are then used for the modeling of passive scalar transport in laminar suspensions as described by an effective diffusivity tensor, and crucial differences between ordered and disordered systems with respect to scalar transport are highlighted. Lastly, turbulence is included in the simulations, and its interaction with a finite-size bubble is characterized. The behavior of a bubble as large as Taylor microscale is shown to share a number of common features with that of a microbubble, most notably, the flow sampled by the bubble is biased. A definition of the liquid flow seen by the bubble, as it enters in usual models for the added mass and the lift forces, is finally proposed.

Direct Numerical Simulations Of Bubbly Flows

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Author : Jian Zhai
language : en
Publisher:
Release Date : 2020

Direct Numerical Simulations Of Bubbly Flows written by Jian Zhai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

Direct Numerical Simulations Of Gas Liquid Multiphase Flows

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Author : Grétar Tryggvason
language : en
Publisher: Cambridge University Press
Release Date : 2011-03-10

Direct Numerical Simulations Of Gas Liquid Multiphase Flows written by Grétar Tryggvason and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-03-10 with Computers categories.

Accurately predicting the behaviour of multiphase flows is a problem of immense industrial and scientific interest. Modern computers can now study the dynamics in great detail and these simulations yield unprecedented insight. This book provides a comprehensive introduction to direct numerical simulations of multiphase flows for researchers and graduate students. After a brief overview of the context and history the authors review the governing equations. A particular emphasis is placed on the 'one-fluid' formulation where a single set of equations is used to describe the entire flow field and interface terms are included as singularity distributions. Several applications are discussed, showing how direct numerical simulations have helped researchers advance both our understanding and our ability to make predictions. The final chapter gives an overview of recent studies of flows with relatively complex physics, such as mass transfer and chemical reactions, solidification and boiling, and includes extensive references to current work.

Direct Numerical Simulation And Two Fluid Modeling Of Multi Phase Bubbly Flows

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Author :
language : en
Publisher:
Release Date : 2007

Direct Numerical Simulation And Two Fluid Modeling Of Multi Phase Bubbly Flows written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Bubbles categories.

Abstract: Results from direct numerical simulations (DNS) of multiphase bubbly flows in vertical and horizontal channels were compared to averaged models of multiphase flows (two-fluid model etc.). The data from the direct numerical simulation were also used to calibrate and improve the averaged models. Steady state laminar flow in a vertical channel was analyzed first. Results from direct numerical simulations are compared with prediction of the steady-state two-fluid model of Antal, Lahey, and Flaherty (1991). The simulations are done assuming a two-dimensional system and the model coefficients are adjusted slightly to match the data for upflow. The model is then tested by comparisons with different values of flow rate and gravity, as well as down flow. Results agree reasonably in the middle of the channel. However, for upflow, model performs poorly near the no-slip wall. To better understand the flow with rising bubbles hugging the no-slip wall, detailed direct numerical simulations of the problem were performed in three dimensions. Deformability of the bubbles was found to play a significant role in the flow structure and averaged flow rate. Finally, the transient buoyancy driven motion of two-dimensional bubbles across a domain bounded by two horizontal walls is studied by. The bubbles are initially released next to the lower wall and as they rise, they disperse. Eventually all the bubbles collect at the top wall. The goal of the study is to examine how a simple one-dimensional model for the averaged void fraction captures the unsteady bubble motion. By using void fraction dependent velocities, where the exact dependency is obtained from simulations of homogeneous bubbly flows, the overall dispersion of the bubbles is predicted. Significant differences remain, however. Results suggest that bubble dispersion by the bubble induced liquid velocity must be included, and by using a simple model for the bubble dispersion improved agreement is found.

Numerical Simulations Of Incompressible Flows

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Author : M. M. Hafez
language : en
Publisher: World Scientific
Release Date : 2003

Numerical Simulations Of Incompressible Flows written by M. M. Hafez and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Mathematics categories.

This book consists of 37 articles dealing with simulation of incompressible flows and applications in many areas. It covers numerical methods and algorithm developments as well as applications in aeronautics and other areas. It represents the state of the art in the field. Contents: NavierOCoStokes Solvers; Projection Methods; Finite Element Methods; Higher-Order Methods; Innovative Methods; Applications in Aeronautics; Applications Beyond Aeronautics; Multiphase and Cavitating Flows; Special Topics. Readership: Researchers and graduate students in computational science and engineering."

Computational Techniques For Multiphase Flows

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Author : Guan Heng Yeoh
language : en
Publisher: Elsevier
Release Date : 2009-10-07

Computational Techniques For Multiphase Flows written by Guan Heng Yeoh and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-10-07 with Computers categories.

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

Numerical Simulations Of Bubbly Flows

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Author : Asghar Esmaeeli-Koosej
language : en
Publisher:
Release Date : 1995

Numerical Simulations Of Bubbly Flows written by Asghar Esmaeeli-Koosej and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

Direct And Large Eddy Simulation Iv

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Author : Bernard Geurts
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29

Direct And Large Eddy Simulation Iv written by Bernard Geurts and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Technology & Engineering categories.

The workshop 'Direct and Large-Eddy Simulation-4' was held at the Uni versity ofTwente, July 18-20, 2001. DLES4is part of a series ofERCOFfAC workshops that originated at the University of Surrey in 1994. Over the years the DLES-series has grown into a major international venue focused on the development and application of direct and large-eddy simulation. Fundamental turbulence - and modeling issues but also elements from modem numerical analysis are at the heart of this field of interest, a fact which is clearly reflected by the contents of these proceedings. Modeling and simulation of complex flow phenomena forms a central ele ment in a large volume of scientific - and applied research. The problem of simulating turbulent flows and capturing their main dynamical features remains a highly motivating challenge. This three-day workshop focused on recent de velopments in numerical and physical modeling of complex flow phenomena concentrating on modem strategies in the field of direct and large-eddy simula tion. A major aim was to promote the exchange of ideas and problems from both industrial and academic background paying attention to physical, mathematical and engineering aspects.

Vortex Methods

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Author : Georges-Henri Cottet
language : en
Publisher: Cambridge University Press
Release Date : 2000-03-13

Vortex Methods written by Georges-Henri Cottet and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-03-13 with Mathematics categories.

This book presents and analyses vortex methods as a tool for the direct numerical simulation of incompressible viscous flows.