Thermal Vibrational Convection in Near-critical Fluids PDF Download
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Author: Anatoliy Vorobiev
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
Author: Anatoliy Vorobiev
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
Author: G. Z. Gershuni
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 382
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Book Description
Recent increasing awareness of the ways in which vibrational effects can affect low-gravity experiments have renewed interest in the study of thermal vibrational convection across a wide range of fields. For example, in applications where vibrational effects are used to provide active control of heat and mass transfer, such as in heat exchangers, stirrers, mineral separators and crystal growth, a sound understanding of the fundamental theory is required. In Thermal Vibrational Convection, the authors present the theory of vibrational effects caused by a static gravity field, and of fluid flows which appear under vibration in fluid-filled cavities. The first part of the book discusses fluid-filled cavities where the fluid motion only appears in the presence of temperature non-uniformities, while the second considers those situations where the vibrational effects are caused by a non-uniform field. Throughout, the authors concentrate on consideration of high frequency vibrations, where averaging methods can be successfully applied in the study of the phenomena. Written by two of the pioneers in this field, Thermal Vibrational Convection will be of great interest to scientists and engineers working in the many areas that are concerned with vibration, and its effect on heat and mass transfer. These include hydrodynamics, hydro-mechanics, low gravity physics and mechanics, and geophysics. The rigorous approach adopted in presenting the theory of this fascinating and highly topical area will facilitate a greater understanding of the phenomena involved, and will lead to the development of more and better-designed experiments.
Author: Bernard Zappoli
Publisher: Springer
ISBN: 9401791872
Category : Technology & Engineering
Languages : en
Pages : 457
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Book Description
This book investigates the unique hydrodynamics and heat transfer problems that are encountered in the vicinity of the critical point of fluids. Emphasis is given on weightlessness conditions, gravity effects and thermovibrational phenomena. Near their critical point, fluids indeed obey universal behavior and become very compressible and expandable. Their comportment, when gravity effects are suppressed, becomes quite unusual. The problems that are treated in this book are of interest to students and researchers interested in the original behavior of near-critical fluids as well as to engineers that have to manage supercritical fluids. A special chapter is dedicated to the present knowledge of critical point phenomena. Specific data for many fluids are provided, ranging from cryogenics (hydrogen) to high temperature (water). Basic information in statistical mechanics, mathematics and measurement techniques is also included. The basic concepts of fluid mechanics are given for the non-specialists to be able to read the parts he is interested in. Asymptotic theory of heat transfer by thermoacoustic processes is provided with enough details for PhD students or researchers and engineers to begin in the field. Key spaces are described in details, with many comparisons between theory and experiments to illustrate the topics.
Author: Institution of Mechanical Engineers (Great Britain). Thermodynamics and Fluid Mechanics Group
Publisher:
ISBN:
Category : Critical point
Languages : en
Pages : 88
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Book Description
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: Radyadour Kh. Zeytounian
Publisher: Springer Science & Business Media
ISBN: 9048124336
Category : Science
Languages : en
Pages : 396
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Book Description
This monograph, entirely devoted to “Convection in Fluids”, presents a unified rational approach of various convective phenomena in fluids (mainly considered as a thermally perfect gas or an expansible liquid), where the main driving mechanism is the buoyancy force (Archimedean thrust) or temperature-dependent surface tension in homogeneities (Marangoni effect). Also, the general mathematical formulation (for instance, in the Bénard problem - heated from below) and the effect of free surface deformation are taken into account. In the case of atmospheric thermal convection, the Coriolis force and stratification effects are also considered. This volume gives a rational and analytical analysis of the above mentioned physical effects on the basis of the full unsteady Navier-Stokes and Fourier (NS-F) equations - for a Newtonian compressible viscous and heat-conducting fluid - coupled with the associated initials (at initial time), boundary (lower-at the solid plane) and free surface (upper-in contact with ambiant air) conditions. This, obviously, is not an easy but a necessary task if we have in mind a rational modelling process, and work within a numerically coherent simulation on a high speed computer.
Author: Nusair Mohammed Ibn Hasan
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 474
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Book Description
Supercritical fluids are fluids at temperature and pressure above their respective critical values. Such fluids are increasingly being used in power generation, refrigeration and chemical process industry. The objectives of the current research were to develop a fundamental understanding of the transport phenomena in near-critical supercritical fluids via high-resolution numerical simulations and careful experiments for improved design of industrial processes and applications that employ supercritical fluids. A set of synergistic experimental and numerical studies were proposed in this research. Four main focus areas under the broad spectrum of supercritical fluid transport were chosen - (a) characterization of thermoacoustic transport, (b) interaction of thermoacoustic transport with natural convection, (c) characterization of acoustically augmented transport and (d) enhancement of mass transport using acoustic waves. A numerical model to simulate thermoacoustic convection in near-critical fluids was developed. In the computational model, the conservation equations were solved along with a real-fluid equation of state for supercritical fluid and variable thermo-physical properties. Thermoacoustic waves in near-critical carbon dioxide were also investigated experimentally on acoustic time scales using a fast response measurement system. The predicted results from the calculation and the measurements provide interesting details regarding the thermal transport mechanisms at near-critical states. The numerical model was applied to investigate the interaction of buoyancy driven flows with thermoacoustic convection in near-critical supercritical fluids. This model can be extensively used for studying the steady-state thermal transport and stability behavior of near-critical fluids. Mechanically driven acoustic waves in supercritical fluid generated by a vibrating wall in a cylindrical resonator were studied both numerically and experimentally. The simulations revealed interesting steady-periodic flow patterns in the resonator filled with near-critical fluid due to the fluctuations caused by the vibrating wall. High-fidelity computational fluid dynamics models of mass transport processes in supercritical fluid extraction systems were also developed. A novel application of acoustically driven transport in supercritical fluid was demonstrated numerically for the supercritical fluid extraction process. The numerical predictions indicated major improvements in the extraction yield due to the application of acoustic waves and can be utilized in the design and optimization of supercritical fluid extraction systems.
Author: Chen, Lin
Publisher: IGI Global
ISBN: 1522520481
Category : Science
Languages : en
Pages : 712
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Book Description
Supercritical fluids have been utilized for numerous scientific advancements and industrial innovations. As the concern for environmental sustainability grows, these fluids have been increasingly used for energy efficiency purposes. Advanced Applications of Supercritical Fluids in Energy Systems is a pivotal reference source for the latest academic material on the integration of supercritical fluids into contemporary energy-related applications. Highlighting innovative discussions on topics such as renewable energy, fluid dynamics, and heat and mass transfer, this book is ideally designed for researchers, academics, professionals, graduate students, and practitioners interested in the latest trends in energy conversion.
Author: Yazdan Pedram Razi
Publisher:
ISBN: 9781315156064
Category : Electronic books
Languages : en
Pages :
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Book Description
"Thermal vibrational convection refers to flows that appear when a nonuniformly heated fluid is subject to external vibration. The book describes the physical mechanism of thermal vibrational convection in porous media under gravitational field and the possibility of convection under acceleration. It discusses applications of modeling microgravity environments such as high frequency acceleration in a space station and material processing in space. It covers various models such as Darcy, Brinkman and Forchheimer and reviews experiments to obtain permeability, porosity and high velocity coefficients. It also discusses porous media in gas production and chemical engineering."--Provided by publisher.
Author: Dan J. Myers
Publisher:
ISBN:
Category :
Languages : en
Pages : 558
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Book Description
