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Kriegseis, J. (author), Rival, D.E. (author)An investigation into the influence of seemingly analogous plate kinematics (plunge vs. tow) for rapidly accelerating, low aspect-ratio plates has been performed. The data was obtained simultaneously by means of a three-dimensional particle tracking velocimetry (3D-PTV) system together with a six-component force/moment sensor. Despite identical...conference paper 2013
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Foss, J.F. (author), Bade, K.M. (author), Neal, D.R. (author), Prevost, R.J. (author)Stereo and planar PIV methods provide a continuous vector field overlaid on a planar surface. A subset of the more general topological considerations are ideally suited for the evaluation of such vector fields. Namely, these methods can: i) identify the singular points and assign their correct index values, and ii) determine if the identified...conference paper 2013
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Timmerman, B. (author), Gibbons, G. (author), Bryanston-Cross, P. (author)The paper presents the development of techniques to study flows in human conducting airways aimed at improving understanding of underlying mechanisms in asthma and Chronic Obstructive Pulmonary Disease (COPD). The models developed are made through additive layer manufacturing (ALM) of segmented lung Computed Tomography (CT) scans. The flow...conference paper 2013
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Morton, C. (author), Yarusevych, S. (author)The present study investigates two techniques for phase averaging time resolved two-dimensional PIV measurements for the purpose of extracting dominant three-dimensional wake characteristics. The first one is the classical phase averaging which uses a reference wake velocity signal measured via Laser Doppler Velocimetry (LDV). The second...conference paper 2013
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- Gharali, K. (author), Johnson, D. (author) conference paper 2013
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(author), Abdurakipov, S.S. (author), Chikishev, L.M. (author)The present work is devoted to a comparative study of low- and high-swirl flows in a model lean combustor. Lean methane-air mixture with equivalence ratio of 0.6 burned at atmospheric pressure. A high-repetition stereoscopic PIV system was used for the velocity measurements both in the reacting and non-reacting flows. During analysis of the...conference paper 2013
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Troolin, D.R. (author), Lee, S.J. (author), Chamorro, L.P. (author)Instantaneous and time-averaged volumetric velocity fields were obtained in the wake of a single, three-bladed hydrokinetic turbine model placed in a water flume at St. Anthony Falls Laboratory at the University of Minnesota, under subcritical conditions. A cylinder was placed upstream of the turbine in order to introduce large coherent motions...conference paper 2013
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Widmann, A. (author), Kurz, A. (author), Simon, B. (author), Grundmann, S. (author), Tropea, C. (author)The research reported in this study addresses the direct measurement of Tollmien-Schlichting (TS) waves on a flat plate, when the laminar boundary layer is excited by velocity perturbations. Tollmien-Schlichting waves are a precursor to natural laminar-to-turbulent transition and, if these waves can be reduced in amplitude, a transition delay...conference paper 2013
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Ichiyanagi, M. (author), Sato, Y. (author), Hishida, K. (author)A molecular tagging technique using the spark tracing method has been applied to measure velocity distributions in submillimeter- scale gas flows that were formed as air jet flows through a sub-millimeter channel. Spark lines were generated by applying a high voltage, based on the air ionization via the electrical discharge phenomena. The...conference paper 2013
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Paisant, J.F. (author), Abdenour, A. (author), Lamadie, F. (author), Charton, S. (author), Randriamanantena, T. (author), Duhamet, J. (author)The study presented here deals with the pulsed flow in a discs and doughnuts column. We aim for the understanding of the hydrodynamic properties of the one-phase flow. We experimentaly investigate the pulsation intensity effects on flow structure. Velocity fields from the PIV process reveal that the use of pulsation intensity (Amplitude x...conference paper 2013
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Shekhar, C. (author), Nishino, K. (author), Iso, Y. (author)The turbulence dissipation rate and turbulence shear stress are estimated inside a cylindrical, stirred flow mixer by carrying out Stereo PIV measurements in twelve vertical and three horizontal planes. The flow domain is vertically oriented, filled with the water. A commercially-available, three-blade impeller, HR-100, is used as the agitator....conference paper 2013
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Karhoff, D.C. (author), Bücker, I. (author), Klaas, M. (author), Schröder, W. (author)The flow field during the intake and the compression stroke of an optical four-stroke, four-valve, single-cylinder gasoline type demonstrator engine is measured using time-resolved stereoscopic particle-image velocimetry (PIV) to analyze these flow structures. The flow is measured in the tumble plane at an engine speed of 1500 rpm in 50...conference paper 2013
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Lynch, K. (author), Scarano, F. (author)A tomographic PIV system is introduced for the instantaneous measurement of the material derivative of velocity (VMD). The system is able to operate with very short temporal separation and is therefore suitable for applications in high-speed flows. The method of operation consists of the imaging of a measurement volume using an array of 12 CCD...conference paper 2013
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Bajpayee, A. (author), Techet, A.H. (author)3D fluid flow visualization is of critical significance to a number of applications ranging from micro scale medical devices to design of ships and airplanes. Out of the various techniques currently used to visualize flow fields, particle image velocimetry (PIV) offers great advantages because it is negligibly intrusive and provides high...conference paper 2013
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Sharma, D.M. (author), Poddar, K. (author)Wind tunnel experiments were carried out at low speed aerodynamics lab at IIT Kanpur to investigate dynamic stall characteristics for a flow past an oscillating NACA 0015 airfoil at various reduced frequencies (k). The NACA airfoil model was design and developed to incorporate simultaneous surface pressure measurement at the mid-span of the...conference paper 2013
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Kim, S. (author), Kim, D.E. (author), Euh, D.J. (author)Thermal stratification is encountered in large pool of water increasingly being used as heat sink in new generation of advanced reactors. These large pools at near atmospheric pressure provide a heat sink for heat removal from the reactor or steam generator, and the containment by natural circulation as well as a source of water for core cooling...conference paper 2013
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Thurow, B.S. (author), Fahringer, T. (author)The recent development of a volumetric PIV system utilizing the unique light-field capturing capabilities of a plenoptic camera is described. The fundamental concept of a plenoptic camera, including a distinction between plenoptic 1.0 and plenoptic 2.0 is given, along with an illustration of the ability to computationally refocus an image after...conference paper 2013
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Kähler, C.J. (author), Cierpka, C. (author), Scharnowski, S. (author), Manhart, M. (author), Sciacchitano, A. (author), Lynch, K. (author), Scarano, F. (author), Wieneke, B. (author), Willert, C. (author), Jeon, Y. J. (author), Chatellier, L. (author), Augereau, L. (author), Tremblais, B. (author), David, L. (author)Classical Particle Image Velocimetry (PIV) uses two representations of the particle image distribution to determine the displacement of the particle image pattern by spatial cross-correlation. The accuracy and the robustness are however limited by the fact that only two representations at t and t +?t are present. Thus, only a first order...conference paper 2013
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De Kat, R. (author), Ganapathisubramani, B. (author)Taylors hypothesis is often applied in turbulent flow analysis to map temporal information into spatial information. Recent efforts in deriving pressure from particle image velocimetry (PIV) have proposed multiple approaches, each with its own weakness and strength. Application of Taylors hypothesis allows us to counter the weakness of an...conference paper 2013
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Buchmann, N.A. (author), Atkinson, C. (author), Honnery, D. (author), Soria, J. (author)This paper demonstrates ultra-high-speed tomographic digital in-line holographic velocimetry measurements of the three-component, three-dimensional velocities and trajectories of micron-sized particles in a supersonic underexpanded jet flow. In high-speed digital in-line holography the depth resolution of the measurement is severely restricted...conference paper 2013