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Author: Chuong Vinh Nguyen
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
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Book Description
This thesis is a compiled collection of works on the development of Particle Image Velocimetry (PIV) and micro PIV for near-wall flow measurements. PIV has been used to study many large scale industrial and biological flows, and micro PIV is increasingly utilised in micro-biological and micro-fluidic flow measurements. Both of the methods however suffer significant errors in the measurements of near wall flows due to the effects of the wall boundary and high velocity gradients. In addition, micro PIV suffers significant errors due to volume illumination and the resultant imaging of out-of-focus particles. Many important phenomena such as near-wall turbulence, near-wall transportation of particles or blood cells occur in near-wall regions, and significant improvement of PIV and micro PIV is required. This thesis is devoted to providing solutions to this demand by proposing three new PIV and micro PIV measurement techniques: image overlapping, volumetric-correlation PIV and interfacial PIV. Although these techniques can be applied to general applications, they have been optimised for biological applications. Image overlapping, when applied to micro PIV data, improves the measurement accuracy by effectively reducing the effect of out-of-focus particles. In micro PIV the imaging of out-of-focus particles by volume illumination causes significant measurement bias over the measurement depth. Image overlapping improves measurement accuracy significantly more than currently available techniques, while requiring fewer computational resources. In contrast to improving micro PIV accuracy by reducing the out-of-focus effect, volumetric-correlation PIV (VPIV) utilises this effect to provide 3-dimensional, 2-component (3D2C) velocity fields. VPIV is further extended to uniquely measure particle concentration. The concentration measurements improve the velocity measurement accuracy and provide additional information to study near-wall particle transport phenomena. VPIV simplifies 3D velocity measurements while requiring cheaper hardware. Challenging PIV and micro PIV measurements of flows near curved walls are further resolved by interfacial PIV. In this technique the fluid regions near curved walls are straightened by conformal transformation and a wall-normal velocity profile, with one-pixel resolution, is obtained utilising a novel line-correlation function and curve fitting.Interfacial PIV substantially simplifies the manual image rotation normally required in traditional PIV techniques, while increasing both the resolution of the near-wall velocity profiles and the accuracy of the wall-shear velocity gradient.
Author: Chuong Vinh Nguyen
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
Get Book Here
Book Description
This thesis is a compiled collection of works on the development of Particle Image Velocimetry (PIV) and micro PIV for near-wall flow measurements. PIV has been used to study many large scale industrial and biological flows, and micro PIV is increasingly utilised in micro-biological and micro-fluidic flow measurements. Both of the methods however suffer significant errors in the measurements of near wall flows due to the effects of the wall boundary and high velocity gradients. In addition, micro PIV suffers significant errors due to volume illumination and the resultant imaging of out-of-focus particles. Many important phenomena such as near-wall turbulence, near-wall transportation of particles or blood cells occur in near-wall regions, and significant improvement of PIV and micro PIV is required. This thesis is devoted to providing solutions to this demand by proposing three new PIV and micro PIV measurement techniques: image overlapping, volumetric-correlation PIV and interfacial PIV. Although these techniques can be applied to general applications, they have been optimised for biological applications. Image overlapping, when applied to micro PIV data, improves the measurement accuracy by effectively reducing the effect of out-of-focus particles. In micro PIV the imaging of out-of-focus particles by volume illumination causes significant measurement bias over the measurement depth. Image overlapping improves measurement accuracy significantly more than currently available techniques, while requiring fewer computational resources. In contrast to improving micro PIV accuracy by reducing the out-of-focus effect, volumetric-correlation PIV (VPIV) utilises this effect to provide 3-dimensional, 2-component (3D2C) velocity fields. VPIV is further extended to uniquely measure particle concentration. The concentration measurements improve the velocity measurement accuracy and provide additional information to study near-wall particle transport phenomena. VPIV simplifies 3D velocity measurements while requiring cheaper hardware. Challenging PIV and micro PIV measurements of flows near curved walls are further resolved by interfacial PIV. In this technique the fluid regions near curved walls are straightened by conformal transformation and a wall-normal velocity profile, with one-pixel resolution, is obtained utilising a novel line-correlation function and curve fitting.Interfacial PIV substantially simplifies the manual image rotation normally required in traditional PIV techniques, while increasing both the resolution of the near-wall velocity profiles and the accuracy of the wall-shear velocity gradient.
Author: Michel Stanislas
Publisher: Springer Science & Business Media
ISBN: 9401725438
Category : Technology & Engineering
Languages : en
Pages : 544
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Book Description
The aeronautics industry is presently aiming for faster design cycles and shorter time to market of new aircraft. It is looking at the same time for improved aerodynamic performance, for evident competitive reasons. Advanced, computer based design systems, including fast and reliable numerical flow solvers, have been developed in the last decade including new turbulence models. On the experimental side, measurement techniques in general have also been improved significantly, however the data evaluation process remains still very time consuming, and unsteady effects and turbulence are often not being captured with sufficient accuracy and detail. The development of Particle Image Velocimetry (PIV) has helped to improve the analysis of the flow fields. After investigations in laboratory scale wind tunnels, a joint initiative on PIV research, by the European Aerospace Research Establishments, within GARTEUR have enabled a wide breakthrough of this new technology in Europe. Within the Research Framework Program of the European Union, the joint research project EUROPIV aimed to apply PIV technology to problems of industrial interest.
Author: Michel Stanislas
Publisher: Springer Science & Business Media
ISBN: 3642187951
Category : Technology & Engineering
Languages : en
Pages : 412
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Book Description
The Particle Image Velocimetry (PIV) measurement technique has undergone a strong development in the last 10 years. This book presents the proceedings of an international workshop held in Zaragoza, Spain on March 31st and April 1st, 2003 containing contributions from worldwide leading teams in the development of the PIV method. Most of these papers have been funded by the EC via the European EUROPIV 2 consortium to improve the performances of this measurement technique toward applications in the European Aeronautical industry, including results which are of strong interest for the worldwide community in Fluid Dynamics.
Author: Markus Raffel
Publisher: Springer
ISBN: 3662036371
Category : Science
Languages : en
Pages : 267
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Book Description
Results from several applications of particle image velocimetry (PIV) to unsteady flows at a laboratory scale have been published, and commercial products are now available for more general laboratory use, but for certain industrially important applications, reliable equipment is often available only from in-house research and development teams. This PIV handbookis intended to transfer know-how from PIV development laboratories to end-users in industry and universities. The book discusses the scientific and technical aspects required to set up a PIV system, allows users to assess the problems involved in the application of PIV, and enables them to design, optimize, and use PIV systems to meet their special needs.
Author: Andreas Schröder
Publisher: Springer Science & Business Media
ISBN: 3540735283
Category : Science
Languages : en
Pages : 516
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Book Description
This book summarizes the main results reached using the EC-funded network PivNet 2. It also presents a survey of the state of the art of scientific research using PIV techniques. You get a clear introduction to the basics of these techniques. The authors then guide you through current and possible future applications for flow analysis, including combustion and supersonic flow. Hundreds of illustrations, many in full color, are provided.
Author: Norman Chigier
Publisher: CRC Press
ISBN: 9781560320289
Category : Technology & Engineering
Languages : en
Pages : 556
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Book Description
The book begins with an introduction to the general problems of making measurements in high temperature and a presentation of chemically reacting flow systems. It describes each instrument with the various diagnostic techniques and discusses measurements that have been made in furnaces, flames, and rocket engines. The detailed measurement techniques described in this book cover a wide spectrum of applications in combustion systems, including gas turbine, rocket measurement techniques that were developed in laboratories. Information obtained on detailed temperature, velocity, particle size, and gas concentration distribution is leading to improve understanding of the chemical combustion process and to design imporvements in combustors.
Author: Giovanna Cavazzini
Publisher: BoD – Books on Demand
ISBN: 9535106252
Category : Science
Languages : en
Pages : 402
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Book Description
The Particle Image Velocimetry is undoubtedly one of the most important technique in Fluid-dynamics since it allows to obtain a direct and instantaneous visualization of the flow field in a non-intrusive way. This innovative technique spreads in a wide number of research fields, from aerodynamics to medicine, from biology to turbulence researches, from aerodynamics to combustion processes. The book is aimed at presenting the PIV technique and its wide range of possible applications so as to provide a reference for researchers who intended to exploit this innovative technique in their research fields. Several aspects and possible problems in the analysis of large- and micro-scale turbulent phenomena, two-phase flows and polymer melts, combustion processes and turbo-machinery flow fields, internal waves and river/ocean flows were considered.
Author: Christian E. Willert
Publisher: Springer
ISBN: 9783662501375
Category :
Languages : en
Pages : 532
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Book Description
Particle Image Velocimetry (PIV) is a non-intrusive optical measurement technique which allows capturing several thousand velocity vectors within large flow fields instantaneously. Today, the PIV technique has spread widely and differentiated into many distinct applications, from micro flows over combustion to supersonic flows for both industrial needs and research. Over the past decade the measurement technique and the hard- and software have been improved continuously so that PIV has become a reliable and accurate method for "real life" investigations. Nevertheless there is still an ongoing process of improvements and extensions of the PIV technique towards 3D, time resolution, higher accuracy, measurements under harsh conditions and micro- and macroscales. This book gives a synopsis of the main results achieved during the EC-funded network PivNet 2 as well as a survey of the state of the art of scientific research using PIV techniques in different fields of application.
Author: Ronald J. Adrian
Publisher: Cambridge University Press
ISBN: 0521440084
Category : Science
Languages : en
Pages : 585
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Book Description
Particle image velocimetry, or PIV, refers to a class of methods used in experimental fluid mechanics to determine instantaneous fields of the vector velocity by measuring the displacements of numerous fine particles that accurately follow the motion of the fluid. Although the concept of measuring particle displacements is simple in essence, the factors that need to be addressed to design and implement PIV systems that achieve reliable, accurate, and fast measurements and to interpret the results are surprisingly numerous. The aim of this book is to analyze and explain them comprehensively.
Author: ANDREAS SCHR÷DER
Publisher: Springer Verlag
ISBN: 9783540735274
Category : Science
Languages : en
Pages : 512
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Book Description
Particle Image Velocimetry (PIV) is a non-intrusive optical measurement technique which allows capturing several thousand velocity vectors within large flow fields instantaneously. Today, the PIV technique has spread widely and differentiated into many distinct applications, from micro flows over combustion to supersonic flows for both industrial needs and research. Over the past decade the measurement technique and the hard- and software have been improved continuously so that PIV has become a reliable and accurate method for "real life" investigations. Nevertheless there is still an ongoing process of improvements and extensions of the PIV technique towards 3D, time resolution, higher accuracy, measurements under harsh conditions and micro- and macroscales. This book gives a synopsis of the main results achieved during the EC-funded network PivNet 2 as well as a survey of the state-of-the-art of scientific research using PIV techniques in different fields of application.
