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Predicting Multidimensional Annular Flow With A Locally Based Two Fluid Model
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Book Synopsis Predicting Multidimensional Annular Flow with a Locally Based Two-fluid Model by :
Download or read book Predicting Multidimensional Annular Flow with a Locally Based Two-fluid Model written by and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work was to: develop a methodology to predict annular flows using a multidimensional four-field, two-fluid Computational Fluid Dynamics (CFD) computer code; develop closure models which use the CFD predicted local velocities, phasic volume fractions, etc ... ; implement a numerical method which allows the discretized equations to have the same characteristics as the differential form; and compare predicted results to local flow field data taken in a R-134a working fluid test section.
Book Synopsis The Development of Multidimensional Two-fluid Modeling Capabilities by :
Download or read book The Development of Multidimensional Two-fluid Modeling Capabilities written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundamental problem in gas/liquid two-phase flow is the prediction of flow regime. Important macroscopic parameters such as pressure drop, wall heat transfer rate and critical heat flux (CHF) depend on the topology of the interface and the distribution of gas and liquid across the channel. The normal means of treating flow regimes is through a flow regime map, where a point in parameter space is assigned a flow regime, and the analysis proceeds based on models for the type of flow regime that is then appropriate. However, flow regime maps, and the models based on them do not work over a broad range of flows; indeed, the very concept of flow regime is limited in application to the particular geometry and range of conditions for which the flow regime map was developed. In addition, flow regime maps are not valid for transient conditions. The authors are developing a model for two-phase flow that is capable of describing the range of flow regimes observed in vertical pipe flow without reliance on a flow regime map. The model is capable of describing both steady and transient flows over a wide range of conditions, and consists of multidimensional equations of balance of mass, energy, and momentum for four fields; namely, continuous gas (cg), continuous liquid (cl), dispersed gas, or bubbles (dg), and dispersed liquid, or droplets (dl). To see that the four-field model is capable of predicting how given fluxes of gas and liquid distribute themselves in pipe or channel flow, consider the schematic of different flow regimes in figure 1. By describing the transverse distribution of bubbles and droplets being carried in continuous liquid and gas, respectively, most fundamental features of flow regimes can be captured. In addition, the local nature of the model requires distributed sources of mass and momentum for each field.
Book Synopsis Heat and Fluid Flow in Microscale and Nanoscale Structures by : Mohammad Faghri
Download or read book Heat and Fluid Flow in Microscale and Nanoscale Structures written by Mohammad Faghri and published by Witpress. This book was released on 2004 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research book gives a general introduction to gas turbine heat transfer topics and also specialises in topics such as external and internal blade cooling, combuster wall cooling, leading and trailing edge cooling and recuperators.
Book Synopsis Instrumentation Development for Multi-dimensional Two-phase Flow Modeling by :
Download or read book Instrumentation Development for Multi-dimensional Two-phase Flow Modeling written by and published by . This book was released on 1999 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multi-faceted instrumentation approach is described which has played a significant role in obtaining fundamental data for two-phase flow model development. This experimental work supports the development of a three-dimensional, two-fluid, four field computational analysis capability. The goal of this development is to utilize mechanistic models and fundamental understanding rather than rely on empirical correlations to describe the interactions in two-phase flows. The four fields (two dispersed and two continuous) provide a means for predicting the flow topology and the local variables over the full range of flow regimes. The fidelity of the model development can be verified by comparisons of the three-dimensional predictions with local measurements of the flow variables. Both invasive and non-invasive instrumentation techniques and their strengths and limitations are discussed. A critical aspect of this instrumentation development has been the use of a low pressure/temperature modeling fluid (R-134a) in a vertical duct which permits full optical access to visualize the flow fields in all two-phase flow regimes. The modeling fluid accurately simulates boiling steam-water systems. Particular attention is focused on the use of a gamma densitometer to obtain line-averaged and cross-sectional averaged void fractions. Hot-film anemometer probes provide data on local void fraction, interfacial frequency, bubble and droplet size, as well as information on the behavior of the liquid-vapor interface in annular flows. A laser Doppler velocimeter is used to measure the velocity of liquid-vapor interfaces in bubbly, slug and annular flows. Flow visualization techniques are also used to obtain a qualitative understanding of the two-phase flow structure, and to obtain supporting quantitative data on bubble size. Examples of data obtained with these various measurement methods are shown.
Book Synopsis Scientific and Technical Aerospace Reports by :
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:
Book Synopsis High Pressure Annular Two-phase Flow in a Narrow Duct. Part 1 by :
Download or read book High Pressure Annular Two-phase Flow in a Narrow Duct. Part 1 written by and published by . This book was released on 1999 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Part 1, detailed measurements were made in a high pressure, adiabatic (boiled at the inlet) annular flow in a narrow, high aspect ratio duct using a gamma densitometer, hot-film anemometer and high-speed video photography. Measurements of void fraction, droplet frequency, velocity, drop size, and interfacial area concentration have been made to support the three field computational capability. An important aspect of this testing is the use of a modeling fluid (R-134a) in a vertical duct which permits visual access in annular flow. This modeling fluid accurately simulates the low liquid-to-vapor density ratio of steam-water flows at high pressures. These measurements have been taken in a narrow duct of hydraulic diameter 4.85 mm, and a cross-section aspect ratio of 22.5. However, the flow displays profiles of various shapes not only in the narrow dimension, but also in the width dimension. In particular, the shape of the droplet profiles depends on the entrained droplet flux from the edges in the vapor core. The average diameter from these profiles compare well with the models developed in the literature. Interfacial area concentration for these low density ratio flows is higher than the highest concentration reported for air-water flows. Video records show that along with the bow-shaped waves, three-dimensional [lambda]-shaped waves appear in annular flows for high flow rates. Part 2 outlines the development of a three-field modeling approach in annular flow and the predictive capability of an analysis code. Models have been developed here or adapted from the literature for the thin film near the wall as well as the droplets in the vapor core, and have been locally applied in a fully developed, two-phase adiabatic boiling annular flow in a duct heated at the inlet at high pressure. Numerical results have been obtained using these models that are required for the closure of the continuity and momentum equations. The two-dimensional predictions are compared with local void fraction and droplet velocity (using a hot film anemometer), and average void fraction (using gamma densitometry) for a refrigerant fluid flowing in a narrow vertical duct with a cross-section aspect ratio of 22.5. Predicted results match the experimental data well for high void fraction annular flows, validating the overall modeling approach.
Book Synopsis Advances in Multi-fluid Flows by : Yuriko Y. Renardy
Download or read book Advances in Multi-fluid Flows written by Yuriko Y. Renardy and published by SIAM. This book was released on 1996-01-01 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers from this conference deal with multi-fluid flows and interfacial instabilities. Papers on multiple-layer convection, wave dynamics in viscous flows, stability of viscoelastic flows, numberical computation of bubbles, and solidification are included.
Book Synopsis Annular Two-Phase Flow by : Geoffrey Hewitt
Download or read book Annular Two-Phase Flow written by Geoffrey Hewitt and published by Elsevier. This book was released on 2013-10-22 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annular Two-Phase Flow presents the wide range of industrial applications of annular two-phase flow regimes. This book discusses the fluid dynamics and heat transfer aspects of the flow pattern. Organized into 12 chapters, this book begins with an overview of the classification of the various types of interface distribution observed in practice. This text then examines the various regimes of two-phase flow with emphasis on the regions of occurrence of the annular flow regime. Other chapters consider the single momentum and energy balances, which illustrate the differences and analogies between single- and two-phase flows. This book discusses as well the simple modes for annular flow with consideration to the calculation of the profile of shear stress in the liquid film. The final chapter deals with the techniques that are developed for the measurement of flow pattern, entrainment, and film thickness. This book is a valuable resource for chemical engineers.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-04 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Volfango Bertola Publisher :CISM International Centre for Mechanical Sciences ISBN 13 : Total Pages :450 pages Book Rating :4.3/5 (91 download)
Book Synopsis Modelling and Experimentation in Two-Phase Flow by : Volfango Bertola
Download or read book Modelling and Experimentation in Two-Phase Flow written by Volfango Bertola and published by CISM International Centre for Mechanical Sciences. This book was released on 2003 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an up-to-date review of recent advances in the study of two-phase flows, with focus on gas-liquid flows, liquid-liquid flows, and particle transport in turbulent flows. The book is divided into several chapters, which after introducing basic concepts lead the reader through a more complex treatment of the subjects. The reader will find an extensive review of both the older and the more recent literature, with abundance of formulas, correlations, graphs and tables. A comprehensive (though non exhaustive) list of bibliographic references is provided at the end of each chapter. The volume is especially indicated for researchers who would like to carry out experimental, theoretical or computational work on two-phase flows, as well as for professionals who wish to learn more about this topic.
Download or read book NBS Special Publication written by and published by . This book was released on 1971 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AIChE Symposium Series by : American Institute of Chemical Engineers
Download or read book AIChE Symposium Series written by American Institute of Chemical Engineers and published by . This book was released on 1972 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1961 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer--Orlando 1980 by : Ralph P. Stein
Download or read book Heat Transfer--Orlando 1980 written by Ralph P. Stein and published by . This book was released on 1980 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Frontiers and Progress in Multiphase Flow I by : Lixin Cheng
Download or read book Frontiers and Progress in Multiphase Flow I written by Lixin Cheng and published by Springer Science & Business Media. This book was released on 2014-04-09 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents state-of-the-art of reviews in the field of multiphase flow. In focusses on nonlinear aspects of multiphase flow networks as well as visualization experiments. The first chapter presents nonlinear aspects or deterministic chaos issues in the systems of multi-phase reactors. The second chapter reviews two-phase flow dynamics in combination with complex network theory. The third chapter discusses evaporation mechanism in the wick of copper heat pipes. The last chapter investigates numerically the flow dynamics and heat and mass transfer in the laminar and turbulent boundary layer on the flat vertical plate.
Book Synopsis Report by : United States. National Bureau of Standards
Download or read book Report written by United States. National Bureau of Standards and published by . This book was released on 1968 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research & Development Reports by :
Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1966 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
