Numerical simulation of fluid flow and heat transfer in a tube near the critical point PDF Download

Author: Sang Ho Lee
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 428

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
In the past, most numerical treatments of naturally-convective flows through a porous material have made use of the Boussinesq approximation. The latter assumes that density changes are important only as a driving force in Darcy's law, and results in considerable simplification. Near the critical point, however, large density changes in the convecting fluid can accompany small temperature changes, thus demanding a compressible treatment. The present study allows for the time-dependent solution of the fully-compressible equations, including Darcy's law, the time-dependent continuity equation, and the time-dependent energy equation. Solution of the above equations is accomplished with the use of two scalar potentials, a generalized streamfunction and a generalized velocity potential, both of which obey elliptic equations.

Author: João M.P.Q. Delgado
Publisher: Springer Science & Business Media
ISBN: 3642350038
Category : Technology & Engineering
Languages : en
Pages : 73

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Book Description
This book presents a critical review on the development and application of hygrothermal analysis methods to simulate the coupled transport processes of Heat, Air, and Moisture (HAM) transfer for one or multidimensional cases. During the past few decades there has been relevant development in this field of study and an increase in the professional use of tools that simulate some of the physical phenomena that are involved in Heat, Air and Moisture conditions in building components or elements. Although there is a significant amount of hygrothermal models referred in the literature, the vast majority of them are not easily available to the public outside the institutions where they were developed, which restricts the analysis of this book to only 14 hygrothermal modelling tools. The special features of this book are (a) a state-of-the-art of numerical simulation tools applied to building physics, (b) the boundary conditions importance, (c) the material properties, namely, experimental methods for the measurement of relevant transport properties, and (d) the numerical investigation and application The main benefit of the book is that it discusses all the topics related to numerical simulation tools in building components (including state-of-the-art and applications) and presents some of the most important theoretical and numerical developments in building physics, providing a self-contained major reference that is appealing to both the scientists and the engineers. At the same time, this book will be going to the encounter of a variety of scientific and engineering disciplines, such as civil and mechanical engineering, architecture, etc... The book is divided in several chapters that intend to be a resume of the current state of knowledge for benefit of professional colleagues.

Author: Tien Mo Shih
Publisher: CRC Press
ISBN: 9780891169192
Category : Science
Languages : en
Pages : 588

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Author: B. L. Cox
Publisher:
ISBN:
Category : Geothermal engineering
Languages : en
Pages : 45

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Book Description
Fluid and heat flow at temperatures approaching or exceeding that at the critical point (374°C for pure water, higher for saline fluids) may be encountered in deep zones of geothermal systems and above cooling intrusives. In the vicinity of the critical point the density and internal energy of fluids show very strong variations for small temperature and pressure changes. This suggests that convective heat transfer from thermal buoyancy flow would be strongly enhanced at near-critical conditions. This has been confirmed in laboratory experiments. We have developed special numerical techniques for modeling porous flow at near critical conditions, which can handle the extreme non-linearities in water properties near the critical point. Our numerical simulations show strong enhancements of convective heat transfer at near-critical conditions; however, the heat transfer rates obtained in the simulations are considerably smaller than data reported from laboratory experiments by Dunn and Hardee. We discuss possible reasons for this discrepancy and develop suggestions for additional laboratory experiments.

Author: W. Minkowycz
Publisher: CRC Press
ISBN: 9781560324416
Category : Science
Languages : en
Pages : 456

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Book Description
This is the first volume in the series. It analyzes several fundamental methodology issues in numerical heat transfer and fluid flow and identifies certain areas of active application. The finite-volume approach is presented with the finite-element methods as well as with energy balance analysis. Applications include the latest development in turbulence modeling and current approaches to inverse problems.

Author: Lin Chen
Publisher: Springer
ISBN: 9811027846
Category : Science
Languages : en
Pages : 175

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Book Description
This book discusses basic thermodynamic behaviors and 'abnormal' properties from a thermo-physical perspective, and explores basic heat transfer and flow properties, the latest findings on their physical aspects and indications, chemical engineering properties, microscale phenomena, as well as transient behaviors in fast and critical environments. It also presents the most and challenging problems and the outlook for applications and innovations of supercritical fluids.

Author: W. Minkowycz
Publisher: CRC Press
ISBN: 135146826X
Category : Science
Languages : en
Pages : 421

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Book Description
This volume discusses the advances in numerical heat transfer modeling by applying high-performance computing resources, striking a balance between generic fundamentals, specific fundamentals, generic applications, and specific applications.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Fluid and heat flow at temperatures approaching or exceeding that at the critical point (374oC for pure water, higher for saline fluids) may be encountered in deep zones of geothermal systems and above cooling intrusives. Laboratory experiments have demonstrated strong enhancements in heat transfer at near-critical conditions (Dunn and Hardee, 1981). We have developed special numerical techniques for modeling porous flow at near-critical conditions, which can handle the extreme non-linearities in water properties near the critical point. Our numerical experiments show strong enhancements of convective heat transfer at near-critical conditions; however, the heat transfer rates obtained in the numerical simulations are considerably smaller than those seen in the laboratory experiments by Dunn and Hardee. We discuss possible reasons for this discrepancy and develop suggestions for additional laboratory experiments.

Author: Heimo Walter
Publisher: Springer
ISBN: 3709148553
Category : Technology & Engineering
Languages : en
Pages : 851

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Book Description
The book comprises the fundamentals of the numerical simulation of fluid flows as well as the modelling of a power plant and plant components. The fundamental equations for heat and mass transfer will be prepared for the application in the numerical simulation. Selected numerical methods will be discussed in detail. The book will deal with the gas as well as with the water/steam flow. Regulation and controller, simplified models and hybrid models as well as the validation of measurement data are also included in the book.