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Development Of A Volumetric 3d Particle Tracking Velocimetry System And Its Application To Mixing In A Stirred Tank
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Book Synopsis Development of a Volumetric 3D Particle Tracking Velocimetry System and Its Application to Mixing in a Stirred Tank by : Ye Cheng
Download or read book Development of a Volumetric 3D Particle Tracking Velocimetry System and Its Application to Mixing in a Stirred Tank written by Ye Cheng and published by . This book was released on 2009 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantitative fluid flow visualization and measurements are highly demanded in mechanical, chemical, medical and many other science and engineering fields to investigate fluid phenomena, understand theoretical principles and support computational prediction. Three-dimensional Particle Tracking Velocimetry (3D-PTV) is a powerful and comprehensive measurement technique that provides instantaneous 3D volumetric velocity information and Lagrangian description of particle trajectories. This work is based on the 3D-PTV technique that was developed at the Institute of Geodesy and Photogrammetric at the Swiss Federal Institute of Technology, Zurich. Theoretical principles of the technique were studied based on geometric imaging and computer vision. A complete 3D-PTV system was designed, assembled, synchronized, and tested. A study of the accuracy of the 3D-PTV system in terms of the influence of each component was performed. 2D-PIV (Particle Image Velocimetry) measurements were done on the same experimental setup used in the 3D-PTV system. Results showed good quantitative agreement between the velocity information obtained with the two systems, which validates the results of the 3D-PTV measurement system. The developed 3D PTV system was applied to the study of mixing in a stirred tank showing that this technique has great potential for the study of low Reynolds number flows where the time-resolved trajectory of particles is important. Further improvement on the configurations and data analysis of the system can provide higher accuracy, higher spatial and temporal resolution, and less complexity, which will lead to an extension on its application.
Book Synopsis Improvement to the Particle Tracking Velocimetry Method and is Application to the Study of the Development Region of a Shallow Turbulent Mixing Layer by : Javier Restrepo Grisales
Download or read book Improvement to the Particle Tracking Velocimetry Method and is Application to the Study of the Development Region of a Shallow Turbulent Mixing Layer written by Javier Restrepo Grisales and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A methodology is proposed to reduce the error in the velocity estimation in Particle Tracking Velocimetry (PTV) for the study of the developing region of a turbulent shallow mixing layer. First, errors in velocity estimation can be reduced by improving the accuracy of the particle centre estimation by maximizing the spatial resolution of the image, with the constraint that it must contain the mixing layer. As the extent of the mixing layer is a function of its free stream velocity, channel width, and depth, the horizontal projection of mixing layers with 31 different combinations of flow parameters (width, depth, and free stream velocities) are studied to develop a model to predict the mixing layer extent as a function of the flow parameters. Secondly, an enhanced particle linking algorithm is proposed to avoid establishing incorrect particle trajectories representing atypical particle displacements. The algorithm uses an ellipsoid search region that varies in space and whose size is a function of the velocity at the position of the particle. The ellipsoid dimension is defined based on the ellipsoid confidence interval containing 99.75% of the velocity at the position of the particle. The velocity field at the surface of the mixing layer is measured using the PTV technique, and the mean, the root mean square, and the gradients of the velocity are analysed to understand the horizontal flow dynamics of the developing region of the shallow mixing layer. In addition, the vertical variation of the velocity is studied, using 3-D PTV, to characterize the vertical nonuniformity of the velocity of the developing mixing layer, and its consequence for particle dispersion"--
Book Synopsis 3D Particle Tracking Velocimetry on Transverse Injection in Supersonic Flow by :
Download or read book 3D Particle Tracking Velocimetry on Transverse Injection in Supersonic Flow written by and published by . This book was released on 2003 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: The supersonic Ludwieg Tube at the Graduate Aeronautical Laboratories of the California Institute of Technology was completed and taken into operation. A smaller Ludwieg Tube with the purpose of providing a transverse jet in the main flow was constructed and taken into operation, thus completing a compact, inexpensive supersonic flow/injection facility. The implementation of three-component, three-dimensional particle image velocimetry in supersonic air flows from the instrument existing for low speed water flows at the time of inception of the program required a much greater development effort than had been anticipated at the outset. Major redesign of the hardware and new software development as well as experimentation with particle generating systems produced an instrument that is now able to fulfill the tasks demanded of it for the project with good accuracy and spatial resolution. Velocities parallel to the camera face can be measured to an accuracy of 0.25% and the component normal to the camera face to 2.5%.
Book Synopsis Particle Image Velocimetry by : Michel Stanislas
Download or read book Particle Image Velocimetry written by Michel Stanislas and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Development of Advanced Techniques for Particle Tracking Velocimetry by : Joseph Alan Duncan
Download or read book The Development of Advanced Techniques for Particle Tracking Velocimetry written by Joseph Alan Duncan and published by . This book was released on 2009 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design of an Endoscopic 3-D Particle-tracking Velocimetry System and Its Application in Flow Measurements Within a Gravel Layer by : Michael Klar
Download or read book Design of an Endoscopic 3-D Particle-tracking Velocimetry System and Its Application in Flow Measurements Within a Gravel Layer written by Michael Klar and published by . This book was released on 2005 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Spatio-temporal Matching Algorithm for 3D Particle Tracking Velocimetry by : Jochen Willneff
Download or read book A Spatio-temporal Matching Algorithm for 3D Particle Tracking Velocimetry written by Jochen Willneff and published by . This book was released on 2003 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CJChE written by and published by . This book was released on 2005-02 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particle Tracking Velocimetry Applied to an Opposed-jet Mixer Configuration by : Dong Zhang
Download or read book Particle Tracking Velocimetry Applied to an Opposed-jet Mixer Configuration written by Dong Zhang and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: After obtaining the stereoscopically flow field images, the minimum number (11) of average frames was determined and the two-dimensional, dynamic movies of three views (front, top, and side) could then be used to describe the dynamic characteristics. In addition to the dynamic movies, the long time (36,000 averaged images) and the instantaneous characteristics will be addressed. The final part of the analysis of the experimental data is to determine an initial condition for the subsequent computational efforts. This initial condition needs to satisfy continuity by determination of the ∂Ux/∂x term from the continuity equation. The term can also be established by using Taylor's hypothesis. Thus the continuity equation evaluation and using Taylor's hypothesis will be compared.
Book Synopsis Large Scale Particle Tracking Velocimetry for 3-dimensional Indoor Airflow Study by : Pascal Henry Biwole
Download or read book Large Scale Particle Tracking Velocimetry for 3-dimensional Indoor Airflow Study written by Pascal Henry Biwole and published by . This book was released on 2009 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: While most research on particle tracking velocimetry (PTV) is devoted either to 2D flows or to small scale 3D flows, this paper describes a complete 3D PTV algorithm and some applications to indoor airflow velocity measurement. A particle detection procedure specially adapted to the physical characteristics of neutrally buoyant helium filled soap bubbles is described. In particular, overlarge particle images are removed. Particle center are calculated by a weigh averaging method. Two temporal tracking schemes are presented and compared. The first one is based on fast normalized cross-correlation with Lagrangian extrapolation in image space to solve ambiguities. The second uses polynomial regression to find an estimated position and applies a quality criterion based on a minimization of changes in particle acceleration; to increase the measurement area and the number of trajectories, the correspondence problem is addressed by a new procedure involving fundamental matrices using both three and two 3D calibrated cameras. 3D triangulation is done by a least squares method. Some guidelines are given in terms of camera and light positioning for 3D PTV in large volumes with various wall colors. Applications of the algorithm include Lagrangian tracking: (i) in a light-gray walled 3.1mx3.1mx2.5m high test-room; (ii) inside a black walled 5.5mx3.7mx2.4m high test-room; (iii) over a heat source and inside; (iv) in experimental aircraft cabin; (v) in a 100cmx 100cmx100cm tank filled with an aqueous solution using continuous light and 10μm-large hollow particles. Results show that the algorithm is capable of tracking more than 1400 tracers in volumes up to 3mx3mx1.2m high.
Book Synopsis Software Development for Particle Tracking Velocimetry by : Ayman Bargas Hatem
Download or read book Software Development for Particle Tracking Velocimetry written by Ayman Bargas Hatem and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Volume Measurement Using Multicolour Three-dimensional Particle Tracking Velocimetry by : Rong Wang
Download or read book Volume Measurement Using Multicolour Three-dimensional Particle Tracking Velocimetry written by Rong Wang and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development and Assessment of Volumetric Particle Tracking Approaches for the Analysis of Flows in Confined Geometries by : Thomas Fuchs
Download or read book Development and Assessment of Volumetric Particle Tracking Approaches for the Analysis of Flows in Confined Geometries written by Thomas Fuchs and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 3D Particle Tracking Velocimetry Using a Stereo Camera Setup by : Till Bosselmann
Download or read book 3D Particle Tracking Velocimetry Using a Stereo Camera Setup written by Till Bosselmann and published by . This book was released on 2009 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exploration of the Flow Field Around an Oscillation Sphere Using 3D Particle Tracking Velocimetry by : Florian Otto
Download or read book Exploration of the Flow Field Around an Oscillation Sphere Using 3D Particle Tracking Velocimetry written by Florian Otto and published by . This book was released on 2004 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Emission Particle Tracking Applied to Solid-liquid Mixing in Mechanically Agitated Vessels by :
Download or read book Positron Emission Particle Tracking Applied to Solid-liquid Mixing in Mechanically Agitated Vessels written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanically agitated vessels are widely used for various mixing operations within a wide range of industries including the chemical, pharmaceutical, food and petroleum industries. They are used for liquid blending, solid-liquid mixing, gas dispersion in liquids, heat/mass transfer enhancement and chemical reaction. Mixing is intrinsically a Lagrangian process and, whilst Eulerian data are essential, Lagrangian information is necessary for its complete description. Possible approaches of generating Lagrangian data can, in principle, employ numerical simulations or experimental techniques based on Lagrangian tracking to provide the trajectories of fluid elements or solid particles. In this work a set of tools are developed for the analysis and theoretical validation of Lagrangian single and multi-phase flow data obtained from tracer trajectories in mechanically agitated vessels. Whilst theoretical procedures developed here exploit a large range of mathematical and statistical concepts with Shannon entropy being an example, the computational data analysis often involved handling and sequential processing of multidimensional matrices containing several millions of data points. Computational codes were developed for performing Lagrangian statistical data analysis, Lagrangian-Eulerian data conversion, Shannon entropy analysis, multi-phase mixing studies and detailed Eulerian multi-plane investigations. The implementation and power of these tools are demonstrated by analysing a wide range of measurements acquired using the technique of positron emission particle tracking (PEPT) during the mixing of Newtonian and non-Newtonian fluids, as well as the mixing of highly concentrated solid-liquid systems. These multi-phase suspensions included monodisperse, binary and polydisperse solid-liquid suspensions. Experimental measurements obtained in these systems are unique and valuable in their own right as, for the first time, it has been possible to determine the full 3D velocity.
Book Synopsis Particle Tracking Velocimetry and Sizing Technique for Studying Mixing of Sprays by : L. Zimmer
Download or read book Particle Tracking Velocimetry and Sizing Technique for Studying Mixing of Sprays written by L. Zimmer and published by . This book was released on 1999 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
