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Design Of An Endoscopic 3 D Particle Tracking Velocimetry System And Its Application In Flow Measurements Within A Gravel Layer
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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 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 3-D Particle Tracking Velocimetry Applied to Turbulent Open-channel Flow Over a Gravel Layer by : Michael Klar
Download or read book 3-D Particle Tracking Velocimetry Applied to Turbulent Open-channel Flow Over a Gravel Layer written by Michael Klar and published by . This book was released on 2001 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Scour and Erosion written by Liang Cheng and published by CRC Press. This book was released on 2014-11-06 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 7th International Conference on Scour and Erosion (ICSE 2014) was organised by the School of Civil, Environmental and Mining Engineering and the Centre for Offshore Foundation Systems at the University of Western Australia under the guidance of the Technical Committee 213 for Scour and Erosion of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE). This biennial conference draws together leading academics, scientists and engineers engaged in scour and erosion research to present and exchange their latest scientific findings. These proceedings, together with the six previous proceedings dating from 2002, present a rare collection of technical and scientific developments in scour and erosion research which have been established over the last 12 years. This book includes state-of-the-art papers in scour and erosion from ICSE 2014, covering the 6 themes of: internal erosion, sediment transport, advanced numerical modelling of scour and erosion, terrestrial scour and erosion, river/bridge scour and erosion, and marine scour and erosion. The proceedings include 5 keynote lectures from world leading researches cutting across the themes of scour and erosion, together with 87 peer-reviewed papers from 19 countries. This book is ideal for researchers and industry working at the forefront of scour and erosion, both with application to rivers and marine operations.
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 Volumetric Particle Velocimetry for Microscale Flows by : Steven Adam Klein
Download or read book Volumetric Particle Velocimetry for Microscale Flows written by Steven Adam Klein and published by . This book was released on 2011 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microfluidics is the study of fluid flow at very small scales (micro -- one millionth of a meter) and is prevalent in many areas of science and engineering. Typical applications include lab-on-a-chip devices, microfluidic fuel cells, and DNA separation technologies. Many of these microfluidic devices rely on micron-resolution velocimetry measurements to improve microchannel design and characterize existing devices. Methods such as micro particle imaging velocimetry (microPIV) and micro particle tracking velocimetry (microPTV) are mature and established methods for characterization of steady 2D flow fields. Increasingly complex microdevices require techniques that measure unsteady and/or three dimensional velocity fields. This dissertation presents a method for three-dimensional velocimetry of unsteady microflows based on spinning disk confocal microscopy and depth scanning of a microvolume. High-speed 2D unsteady velocity fields are resolved by acquiring images of particle motion using a high-speed CMOS camera and confocal microscope. The confocal microscope spatially filters out of focus light using a rotating disk of pinholes placed in the imaging path, improving the ability of the system to resolve unsteady microPIV measurements by improving the image and correlation signal to noise ratio. For 3D3C measurements, a piezo-actuated objective positioner quickly scans the depth of the microvolume and collects 2D image slices, which are stacked into 3D images. Super resolution microPIV interrogates these 3D images using microPIV as a predictor field for tracking individual particles with microPTV. The 3D3C diagnostic is demonstrated by measuring a pressure driven flow in a three-dimensional expanding microchannel. The experimental velocimetry data acquired at 30 Hz with instantaneous spatial resolution of 4.5 by 4.5 by 4.5 microns agrees well with a computational model of the flow field. The technique allows for isosurface visualization of time resolved 3D3C particle motion and high spatial resolution velocity measurements without requiring a calibration step or reconstruction algorithms. Several applications are investigated, including 3D quantitative fluorescence imaging of isotachophoresis plugs advecting through a microchannel and the dynamics of reaction induced colloidal crystal deposition.
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 Three Dimensional Particle Tracking Velocimetry Using Synthetic Aperture Imaging by : Abhishek Bajpayee
Download or read book Three Dimensional Particle Tracking Velocimetry Using Synthetic Aperture Imaging written by Abhishek Bajpayee and published by . This book was released on 2014 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: 3D visualization of fluid flow is of critical significance to a number of applications ranging from micro-scale medical devices to design of ships and airplanes. Of the various techniques currently used to visualize flow fields, particle image velocimetry (PIV) offers great advantages because of the high resolution quantitative results it provides. The feasibility of using synthetic aperture (SA) imaging to conduct 3D Particle Image Velocimetry (PIV) has been previously demonstrated. This thesis presents the development of a technique that extends SA imaging to 3D Particle Tracking Velocimetry (PTV), adding the ability to conduct Lagrangian studies on flow fields over time. A new method has been developed to accurately locate seeding particles in volumes reconstructed using SA imaging, based on a proposed thresholding and average intensity based scheme, which is able to locate particles in densely seeded flows. In addition, a new and much faster method for reconstructing volumes, based on a homography fit (HF) refocusing method, is proposed which facilitates rapid processing of large amounts of data recorded using high speed cameras for example. The capability of using SA imaging to conduct PTV is demonstrated by tracking located particles using the relaxation based algorithm. The developed technique provides accurate and high resolution PTV results at a much higher computation speed compared to other state of the art techniques. If engineered further,the presented technique has the potential to become the method of choice to conduct velocimetry.
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 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 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:
Book Synopsis Estimating Particle Velocity From Dual-Camera Mixed Reality Video Images Using 3D Particle Tracking Velocimetry by : Thomas Chivers
Download or read book Estimating Particle Velocity From Dual-Camera Mixed Reality Video Images Using 3D Particle Tracking Velocimetry written by Thomas Chivers and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixed reality (MR) systems integrate diverse sensors, allowing users to better visualize and quantify surrounding environmental processes. Some existing mixed reality headsets include synchronized front-facing cameras that, among other things, can be used to track naturally occurring tracer particles (such as dust or snowflakes) to estimate particle velocity field in real time. The current work presents a 3D particle tracking velocimetry (PTV) method for use with MR systems, which combines various monocular cues to match particles between corresponding stereo images. Binocular disparity is used to estimate particle distance from an observer. Individual particles are tracked through time and used to construct the vector field of a scene. A digital display of velocity vectors can be broadcasted into a user's surrounding environment with the MR headset to be used as a flow visualization tool. The mixed reality particle tracking velocimetry (MR-PTV) approach was optimized to perform in natural conditions where particle size, particle color, and lighting are non-uniform. The approach was first tested using synthetic particle image data obtained by discrete element method simulations then experimentally validated for particles transported by a flume flow using the Microsoft HoloLens 2 MR headset. Uniform flow and flow around a body were considered experimentally. Experimental velocity measurements are compared to computational fluid dynamics results. The resulting MR-PTV system can be used for a variety of industry, scientific and recreational purposes for field-based measurement of particle velocities in real time.
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 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 Micro-particle Streak Velocimetry by : Prasun Mahanti
Download or read book Micro-particle Streak Velocimetry written by Prasun Mahanti and published by . This book was released on 2011 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes a novel, low cost strategy of using particle streak (track) images for accurate micro-channel velocity field mapping. It is shown that 2-dimensional, 2-component fields can be efficiently obtained using the spatial variation of particle track lengths in micro-channels. The velocity field is a critical performance feature of many microfluidic devices. Since it is often the case that un-modeled micro-scale physics frustrates principled design methodologies, particle based velocity field estimation is an essential design and validation tool. Current technologies that achieve this goal use particle constellation correlation strategies and rely heavily on costly, high-speed imaging hardware. The proposed image/ video processing based method achieves comparable accuracy for fraction of the cost. In the context of micro-channel velocimetry, the usability of particle streaks has been poorly studied so far. Their use has remained restricted mostly to bulk flow measurements and occasional ad-hoc uses in microfluidics. A second look at the usability of particle streak lengths in this work reveals that they can be efficiently used, after approximately 15 years from their first use for micro-channel velocimetry. Particle tracks in steady, smooth microfluidic flows is mathematically modeled and a framework for using experimentally observed particle track lengths for local velocity field estimation is introduced here, followed by algorithm implementation and quantitative verification. Further, experimental considerations and image processing techniques that can facilitate the proposed methods are also discussed in this dissertation. Unavailability of benchmarked particle track image data motivated the implementation of a simulation framework with the capability to generate exposure time controlled particle track image sequence for velocity vector fields. This dissertation also describes this work and shows that arbitrary velocity fields designed in computational fluid dynamics software tools can be used to obtain such images. Apart from aiding gold-standard data generation, such images would find use for quick microfluidic flow field visualization and help improve device designs.
Book Synopsis Three-dimensional Particle Tracking Velocimetry for Turbulence Applications by :
Download or read book Three-dimensional Particle Tracking Velocimetry for Turbulence Applications written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Instrumentation for Fluid Particle Flow by : S.L. Soo
Download or read book Instrumentation for Fluid Particle Flow written by S.L. Soo and published by Elsevier. This book was released on 1999-10-01 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some of the most original and productive research specialists in the field of particle-fluid flow systems are assembled in this book, which is an important and current reference volume. The book focuses on methods of measurement and options for engineers
