Nozay, France
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Milanovic I.M.,University of Hartford | Hammad K.J.,Dantec Dynamics Inc.
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM | Year: 2010

Turbulent jets have been extensively studied in the past due to their fundamental importance and wide spread usage in numerous industrial processes to enhance momentum, heat and mass transfer. Most previous work focused on the far-field or self-similar region of the flow. However, the initial development region, where the flow is dominated by streamwise and large-scale, Kelvin-Helmholtz-type, structures, received far less attention. In the current study, Particle Image Velocimetry (PIV) was used to obtain reliable statistics in the near-field region of a turbulent submerged jet. The jet issued from an 84 diameter, D, long pipe which ensured fullydeveloped turbulent flow conditions at the outlet. The twodimensional flow field in the plane containing the jet axis was measured in the initial 8D region, for three Reynolds numbers: 14,602, 19,135, and 24,685. The selected Reynolds numbers overlap with the previously identified critical Reynolds number range, 10,000-20,000, where flow characteristics of a jet undergo a dramatic transition to a much more chaotic and wellmixed state or fully developed turbulence. Copyright © 2010 by ASME.


Kitzhofer J.,TU Bergakademie Freiberg | Nonn T.,Dantec Dynamics Inc. | Brucker C.,TU Bergakademie Freiberg
Experiments in Fluids | Year: 2011

This review paper addresses the integration of advanced visualization techniques into the analysis of volumetric vector fields obtained by experimental measurement techniques such as holographic PIV, tomographic PIV, 3D PTV or defocusing PIV. The paper follows the idea of the pipeline process for flow visualization focusing on experimental data generation and advanced visualization techniques. The paper tries to help the experimentalist navigating the landscape of recently developed volumetric measurement techniques and advanced visualization techniques. The processing steps and related difficulties are illustrated with the transitional backward facing step flow experiment at Re h = 4,440. The paper shows the usage of flow visualization for quantitative volumetric PIV data analysis. © 2011 Springer-Verlag.


Hammad K.J.,Dantec Dynamics Inc.
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM | Year: 2010

The turbulent two-phase flow arising from the normal impingement of a round free-surface water jet on a horizontal air-water interface was experimentally studied. Due to the weakly viscous nature of the flow system under consideration, external perturbations or small variations in jet inflow conditions can lead to drastically different flow field characteristics under seemingly similar test conditions. In the current study, a fully developed turbulent jet, exiting a long pipe, ensured properly characterized inflow conditions. The study considered two jet inflow conditions; one entrained air and created a bubbly two-phase flow field while the other did not. Particle image velocimetry (PIV) was used to characterize the flow field beneath the interface, with and without air entrainment, for various nozzle-to-interface separation distances. Turbulent velocity fields of the continuous-phase and dispersed-phase were simultaneously measured in the developing flow region and presented using Reynolds decomposition into mean and fluctuating components. The mean and RMS velocities of the two-phase flow field were compared with velocity measurements obtained under singlephase conditions. Copyright © 2010 by ASME.


A velocimetry system for measuring the velocity of a moving body propagating through a measurement volume includes a light source for emitting a light beam, a controller for generating a modulation pattern corresponding to a desired set of fringes to be generated in the measurement volume, and a spatial light modulator operatively connected to the controller to receive therefrom the modulation pattern. The spatial light modulator is configured to spatially modulate the light beam according to the modulation pattern in order to generate the desired set of fringes in the measurement volume. Also provided are a light detector for measuring the energy of the light scattered by the moving body as it intersects the fringes, and a data analysis unit operatively connected to the light detector and adapted to determine the velocity of the moving body from at least one fringe characteristic and the energy of the scattered light measured.


Trademark
Dantec Dynamics Inc. | Date: 2013-03-06

Illumination modules specially designed for anemometer systems comprising lasers, optical components and electronic modules.


Trademark
Dantec Dynamics Inc. | Date: 2014-08-06

Imaging systems comprising illumination components, camera, lenses, electronic processor, computer and software.


Trademark
Dantec Dynamics Inc. | Date: 2014-09-30

Particle dynamics analyzer systems and components thereof namely lenses, filters and photomultipliers, electronic and electro-mechanical components.


Trademark
Dantec Dynamics Inc. | Date: 2016-09-19

Sensor systems and components thereof for identifying and locating defects on or under the surface of solid structures, namely, composite panels, frames, bodies and tanks, using a camera, camera lens, optics, laser light illumination system, image acquisition and processing electronics.


Trademark
Dantec Dynamics Inc. | Date: 2013-03-06

Illumination modules specially designed for anemometer systems comprising lasers, optical components and electronic modules.


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