A study by holographic velocimetry of the behaviour of free small particles in a flow

Dadi, M.; Stanislas, Michel; Rodriguez, O.; Dyment, A.

doi:10.1007/bf00202462

Cited by 14 publications

(3 citation statements)

References 6 publications

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“…Stereoscopic recording can also be achieved with a single camera by placing a set of mirrors in front of the recording lens [13]. Holographic PIV recording is another approach capable of recovering the third displacement component [14,15]. If sufficient illumination power is present, the light sheet can be expanded into a thick slab such that threedimensional PIV measurements are possible throughout a volume [16].…”

Section: Introductionmentioning

confidence: 99%

Stereoscopic digital particle image velocimetry for application in wind tunnel flows

Willert¹

1997

Meas. Sci. Technol.

342

168

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A particle image velocimetry system capable of accurately recovering the out-of-plane velocity component has been realized based on a stereoscopic viewing arrangement. To allow a large viewing angle with long focal length objective lenses, the angular displacement or Scheimpflug imaging configuration is employed in which the image, object and lens planes intersect in a common line. The varying magnification factor associated with this imaging configuration is accounted for using an accurate and simple-to-use calibration procedure based on solving the projection equations for each of the two cameras. A pair of high-resolution cameras, both capable of recording image pairs in the microsecond range, are synchronized to a pulsed Nd-YAG laser. By placing the cameras on either side of the light sheet the favourable light scattering characteristics of micron-sized seeding particles in forward scatter provide images at significantly higher illumination than at normal or backscatter viewing angles. Ultimately designed for use in industrial wind tunnels, the camera system is capable of working with non-symmetric arrangements. It has been successfully tested in a laboratory environment by imaging the unsteady flow field of a vortex ring passing through a laser light sheet. Adaptive processing software capable of dynamically adjusting the sample location of the interrogation windows to the local displacement vector significantly improves data yield. The algorithm requires only the selection of the final window/overlap size. The hierarchical interrogation approach permits the processing of images whose displacement dynamic range exceeds the interrogation window size.

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Section: Introductionmentioning

confidence: 99%

Stereoscopic digital particle image velocimetry for application in wind tunnel flows

Willert¹

1997

Meas. Sci. Technol.

342

168

View full text Add to dashboard Cite

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“…In order to gain three components of velocity, there are several strategies that can be employed [44], including using two perspectives (stereoscopic PIV) [45], using two planes of imaging (dual plane PIV) [46], or using holographic imaging to digitally refocus the image [47]. These implementations, which yield three-component velocity fields in two spatial dimensions, also require more complicated optical setups.…”

Section: Microfluidic Velocimetrymentioning

confidence: 99%

Microscale imaging of cilia-driven fluid flow

Huang

Choma

2014

Cell. Mol. Life Sci.

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Cilia-driven fluid flow is important for multiple processes in the body, including respiratory mucus clearance, gamete transport in the oviduct, right-left patterning in the embryonic node, and cerebrospinal fluid circulation. Multiple imaging techniques have been applied towards quantifying ciliary flow. Here we review common velocimetry methods of quantifying fluid flow. We then discuss four important optical modalities, including light microscopy, epifluorescence, confocal microscopy, and optical coherence tomography, that have been used to investigate cilia-driven flow.

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“…To conclude with fluid mechanics: I said earlier that, since the BBO equation helps explain the motion of particles floating in air, one should stress the importance it has taken today in the field of chemical engineering (settling and decanting, aerosols, transportation of dusty materials) and in the protection of the environment (takeoff, transportation and diffusion of polluting particles, behaviour of aerosols in the high atmosphere). In more concrete terms, the BBO problem is today at the origin of the validation of powerful techniques such as holographic velocimetry in fluid mechanics (see, for example, Dadi et al [43]).…”

Section: Boussinesq's Modern Legacymentioning

confidence: 99%

Joseph Boussinesq (1842–1929): a pioneer of mechanical modelling at the end of the 19th Century

Bois

2007

Comptes Rendus. Mécanique

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Researchers in Mechanics who have never heard the name of Joseph Boussinesq are few. Boussinesq first taught at the Faculty of Sciences in Lille for about fifteen years, then, after being elected to the Academy of Sciences in Paris, taught there for over forty years. From his work, both in Lille and in the Academy of Sciences, he left a great many publications, touching on a variety of subjects, as proof of his many talents. Oddly enough, however, Boussinesq is almost always known to the world of scientific research through only one facet of his many talents. He is little known in France outside some specialized circles where his subjects of research are studied.For those who have some knowledge in the history of mechanical science, it certainly comes as a surprise to see such a phenomenon. Here is a scientist of international renown, who wrote equations, 'Boussinesq's equations', came up with new hypotheses, 'Boussinesq's hypotheses', formulae, 'Boussinesq's formulae' etc. and yet today seems to have vanished from all scientific memory. Boussinesq's name, however, is far from being forgotten. While his area is too specialised to be mentioned in a common dictionary he did have an entry, however, signed by H. Berger and C. Ballot [1] in the Dictionary of Scientific Biography. The town of Saint-André de Sangonis, his birthplace, had a commemoration in his honour on 20 April 1996. The town of Montpellier named a street after him. There is a portrait of Boussinesq at the Lille University of Sciences and Technology (USTL), as seen by a mathematician (M. Parreau [2]). During the last decade three papers about mechanics also commemorated Boussinesq, the scientist: one (W.H. Hager and F. Raemy [3]) deals with his works on turbulence, the two others (R. Zeytounian [4,5]) deal with the Approximation. Finally in 2004, the Netherlands created the Dutch Boussinesq Center for Hydrology under the authority of the Koninklijke Nederlandse Akademie van Wetenschappe (KNAW: Royal Netherlands Academy of Arts and Sciences). Since 2005 the Center has been organizing a series of 'Boussinesq Lectures' given by scientists of world renown dealing with hydrology and soil mechanics.Boussinesq was clearly one of the most underrated scientists that USTL has ever had. It is hoped that a more complete portrait paying homage to his incredibly diverse talents, will at last help restore the rank he deserves.It is often said that mechanics is the most physical field of mathematics, and, conversely, that it is the most mathematical field of physics. This double definition emphasizes one of the identity problems of this science, claimed by both communities, that of mathematics and of physics. Mathematicians see in mechanics a concrete field of application for the often abstract theories they formulate, or they analyse mechanical phenomena to draw concepts out of them in order to reach the same abstraction. An example of this mathematical way of looking at mechanics is the portrait of Boussinesq which M. Parreau made in Lille, and in which he remarks ...

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A study by holographic velocimetry of the behaviour of free small particles in a flow

Cited by 14 publications

References 6 publications

Stereoscopic digital particle image velocimetry for application in wind tunnel flows

Stereoscopic digital particle image velocimetry for application in wind tunnel flows

Microscale imaging of cilia-driven fluid flow

Joseph Boussinesq (1842–1929): a pioneer of mechanical modelling at the end of the 19th Century

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