Searched for: subject:"particle%5C+image%5C+velocimetry"
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Scarano, F. (author), Jux, C. (author), Sciacchitano, A. (author)
The present work reviews the recent developments in the domain of particle image velocimetry (PIV) with attention to its use for large-scale problems of interest for industrial aerodynamics. The article introduces the fundamental principles of flow seeding for large-scale experiments based on the helium-filled soap bubble (HFSB) technique....
journal article 2021
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Sciacchitano, A. (author), Arpino, F. (author), Cortellessa, G. (author)
We present an experimental benchmark database for the transitional cavity flow. The database is obtained by planar Particle Image Velocimetry measurements at the median plane of the cavity model, for Reynolds numbers between 6300 and 19,000 based on the cavity height. A detailed uncertainty analysis of the experimental results is performed...
journal article 2021
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Adatrao, S. (author), Bertone, M. (author), Sciacchitano, A. (author)
A novel approach is devised for the quantification of systematic uncertainty due to peak locking in particle image velocimetry (PIV), which also leads to correction of the peak-locking errors. The approach, applicable to statistical flow properties such as time-averaged velocity and Reynolds stresses, relies on image recordings with multiple...
journal article 2021
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Voorneveld, J.D. (author), Keijzer, L.B.H. (author), Strachinaru, Mihai (author), Bowen, Daniel J. (author), Mutluer, Ferit O. (author), van der Steen, A.F.W. (author), Ten Cate, Folkert (author), de Jong, N. (author), Vos, H.J. (author), Van den Bosch, Annemien E. (author), Bosch, Johan G. (author)
High frame rate (HFR) echo-particle image velocimetry (echoPIV) is a promising tool for measuring intracardiac blood flow dynamics. In this study we investigate the optimal ultrasound contrast agent (UCA: SonoVue®) infusion rate and acoustic output to use for HFR echoPIV (PRF = 4900 Hz) in the left ventricle (LV) of patients. Three...
journal article 2021
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Jacobi, G. (author)
As soon a ship operates at high forward speeds its weight is pre-dominantly supported by hydrodynamic, rather than hydrostatic forces. Small changes in the dynamic pressure distribution on the ship hull can have a significant influence on the ship’s running attitude in calm water, but also on its seakeeping performance. In order to further...
doctoral thesis 2020
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Saredi, E. (author), Sciacchitano, A. (author), Scarano, F. (author)
A novel approach is investigated to extend the range of measurable velocities by 3D-PTV systems. The method is specifically conceived for robotic volumetric PTV measurements, but it has applications for other similar techniques. The multi-Δt method relies upon combining the information from two or more sets of double-frame images with pulse...
journal article 2020
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Terra, W. (author), Sciacchitano, A. (author), Scarano, F. (author)
The Reynolds number effects on body limbs of a cyclist model, namely leg and arm, are investigated via robotic volumetric Particle Image Velocimetry measurements in the velocity range from 5 ​m/s to 25 ​m/s. The near wakes of such body limbs feature recirculation regions whose width and length are governed not only by the taper of the body...
journal article 2020
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Ataei Dadavi, I. (author)
In the chain of steel production, the blast furnace converts iron ore into liquid iron. The hearth of the blast furnace, where the liquid metal is collected and tapped off, is filled with relatively large coke particles (D ~ 20 – 100 mm). The meandering flow of hot liquid metal in the coarse-grained porous medium in the hearth causes erosion of...
doctoral thesis 2020
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Bertocchi, F. (author)
Flows in rod bundles are common to many industrial applications such as heat exchangers or some types of nuclear reactors. The core of many classes of nuclear reactors can be easily sketched as a bundle of rods, the fuel pins, inmmersed in an axial ow of coolant that removes the heat produced by the fission reaction. Coupling this geometry to an...
doctoral thesis 2020
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Duinmeijer, S.P.A. (author), Oldenziel, G. (author), Clemens, F.H.L.R. (author)
In order to analyse the flow characteristics of free-surface vortexes and to validate the Burgers vortex model by using stereo particle image velocimetry, experiments are conducted in a 600 mm diameter vortex tank. Measured axial velocities indicate that 10–25% of the flow is transported through the vortex core. The velocity profiles show that...
journal article 2020
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Vos, H.J. (author), Voorneveld, J.D. (author), Groot Jebbink, Erik (author), Leow, Chee Hau (author), Nie, Luzhen (author), van den Bosch, Annemien E. (author), Tang, Meng Xing (author), Freear, Steven (author), Bosch, Johan G. (author)
Cardiac function and vascular function are closely related to the flow of blood within. The flow velocities in these larger cavities easily reach 1 m/s, and generally complex spatiotemporal flow patterns are involved, especially in a non-physiologic state. Visualization of such flow patterns using ultrasound can be greatly enhanced by...
review 2020
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Rezaeiha, Abdolrahim (author), Kotsonis, M. (author)
Wind tunnel measurements are performed to investigate the potential for mitigation of aerodynamic load fluctuations on airfoils, as the main source of fatigue for wind turbines, using plasma actuators. The experiment consists of aerodynamic force measurements using six strain gauges and 2-component velocity measurements using particle image...
journal article 2020
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Voorneveld, J.D. (author), Saaid, H. (author), Schinkel, C.V. (author), Radeljic, Nikola (author), Lippe, Boris (author), Gijsen, F.J.H. (author), van der Steen, A.F.W. (author), de Jong, N. (author), Claessens, T.P.T. (author), Vos, H.J. (author), Kenjeres, S. (author), Bosch, Johan G. (author)
Left ventricular (LV) blood flow is an inherently complex time-varying 3-D phenomenon, where 2-D quantification often ignores the effect of out-of-plane motion. In this study, we describe high frame rate 4-D echocardiographic particle image velocimetry (echo-PIV) using a prototype matrix transesophageal transducer and a dynamic LV phantom for...
journal article 2020
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CUI, Guangyao (author), PAN, C. (author), WU, Di (author), Ye, Q. (author), WANG, Jinjun (author)
The characteristics of turbulent boundary layer over streamwise aligned drag reducing riblet surface under zero-pressure gradient are investigated using particle image velocimetry. The formation and distribution of large-scale coherent structures and their effect on momentum partition are analyzed using two-point correlation and probability...
journal article 2019
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Sciacchitano, A. (author)
Particle image velocimetry (PIV) has become the chief experimental technique for velocity field measurements in fluid flows. The technique yields quantitative visualizations of the instantaneous flow patterns, which are typically used to support the development of phenomenological models for complex flows or for validation of numerical...
review 2019
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Adatrao, S. (author), Sciacchitano, A. (author)
A novel approach is introduced that allows the elimination of undesired laser light reflections from particle image velocimetry (PIV) images. The approach relies upon anisotropic diffusion of the light intensity, which is used to generate a background image to be subtracted from the original image. The intensity is diffused only along the...
journal article 2019
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Head, A.J. (author), Colonna, Piero (author), Schrijer, F.F.J. (author), Gallo, M. (author), Novara, M. (author)
This work assesses the feasibility of the planar PIV technique to study the characteristics of a siloxane vapor D4. Titanium dioxide (TiO2) seeding particles were used to track the motion around a rotating disk in a low speed flow. Vector fields of natural convection (NC) and a superposition of NC and rotating flow were selected as exemplary...
journal article 2019
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Saaid, Hicham (author), Voorneveld, Jason (author), Schinkel, C.V. (author), Westenberg, Jos (author), Gijsen, F.J.H. (author), Segers, Patrick (author), Verdonck, Pascal (author), de Jong, N. (author), Kenjeres, S. (author)
Left ventricular flow is intrinsically complex, three-dimensional and unsteady. Its features are susceptible to cardiovascular pathology and treatment, in particular to surgical interventions involving the valves (mitral valve replacement). To improve our understanding of intraventricular fluid mechanics and the impact of various types of...
journal article 2019
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Ataei Dadavi, I. (author), Chakkingal, M. (author), Kenjeres, S. (author), Kleijn, C.R. (author), Tummers, M.J. (author)
This paper reports on an experimental study of natural convection in an enclosure that is heated at the bottom and cooled at the top, filled with a packed bed of relatively large solid spheres. Nusselt numbers were measured for various sphere conductivities, spheres sizes and sphere packings for Rayleigh numbers varying between 10<sup>7</sup>...
journal article 2019
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Bertocchi, F. (author), Rohde, M. (author), Kloosterman, J.L. (author)
The core of a Liquid Metal Fast Breeder Reactor (LMFBR) consists of cylindrical fuel rods that are wrapped by a helicoidally-wound wire spacer to enhance mixing and to prevent damage by fretting. It is known that the liquid metal close to the rod is forced to follow the wires, and that liquid metal further away from the rod crosses the wires ...
journal article 2019
Searched for: subject:"particle%5C+image%5C+velocimetry"
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