Flow Visualization

Merzkirch, W.

doi:10.1016/b0-12-227410-5/00247-7

Cited by 38 publications

(52 citation statements)

References 2 publications

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“…The white loops on the left and right of the image, with interior dark spots, are the cross section of the vortex ring at its midplane. The visualization technique highlights the fringes of the vortical cores but leaves the core itself as a distinct dark spot due to light-scattering soap-film particles being centrifuged outwards [12]. That is, the relatively dense soapfilm particles are displaced from the vortex core by centrifugal forces that arise due to the large angular momentum of the vortex.…”

mentioning

confidence: 99%

Experimental Investigation of Primary and Secondary Features in High-Mach-Number Shock-Bubble Interaction

et al. 2007

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Experiments to study the compression and unstable evolution of an isolated soap-film bubble containing helium, subjected to a strong planar shock wave (M=2.95) in ambient nitrogen, have been performed in a vertical shock tube of square internal cross section using planar laser diagnostics. The early phase of the interaction process is dominated by the formation of a primary vortex ring due to the baroclinic source of vorticity deposited during the shock-bubble interaction, and the mass transfer from the body of the bubble to the vortex ring. The late time (long after shock interaction) study reveals the presence of a secondary baroclinic source of vorticity at high Mach number which is responsible for the formation of counterrotating secondary and tertiary vortex rings and the subsequent larger rate of elongation of the bubble.

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confidence: 99%

Experimental Investigation of Primary and Secondary Features in High-Mach-Number Shock-Bubble Interaction

et al. 2007

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“…One straightforward method for visualizing flow is to inject dye into fluid and image its subsequent transport [36]. Visualization of dye movement is often enough to qualitatively differentiate the presence versus the absence of flow.…”

Section: Microfluidic Velocimetrymentioning

confidence: 99%

“…That is, based on the physical property being measured by the imaging modality, the dye must have some discernible signal that differs from the surrounding fluid [36]. In the case of simple color video microscopy, this contrast can be as simple as colored dye in a clear fluid.…”

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 improve the measurement accuracy for displacement of moire fringe, a method by phase measurement of moire fringe is proposed. The relationship between phase ço and displacement h of moire fringe is [5] ço=2itJh (4) Thus the deflective angle a can be expressed as a== Oço =cpp D 2,rDf0 2,rD (5) For a weak deflection, the relation between the deflection angle a and refractive index n is given by [6] a = --f-dz (6) where flç/ 5 environmental refractive index; and L is the length of test section. Thus, the phase variation çi of moire fringe can be written as a function of refractive index n O=2irRLJdZ (7) pnoo 0ay For a two-dimensional flow field, the differential 8n/ôy of refractive index in y-direction can be obtained as = pnoo p (8) a3 2,rDL By using the Gladstone-Dale formula n = 1 + Kp ( K is Gladstone-Dale constant), the differential 3p/ôy of density p in y-direction can be obtained as •g= PcX ço (9) ô)) 2icKDL…”

Section: Experimental Arrangement and Principles Of Laser Moire Deflementioning

confidence: 99%

Laser moire deflectometry applicable for mini/micro-scale flow visualization

Song

Zhang

2003

SPIE Proceedings

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In this paper a Laser Moire deflectometry applicable for mini/micro-scale flow visualization is proposed. Based on the moire effect, the displacements of moire fringes can be used to calculate the deflection angle of laser beam, which is induced by the variation of refractive index in thermal flow fluid. Thus, density and temperature distribution of flow fluid can be obtained. The physical and mathematical model of the laser moire deflectometry is presented in detail. A digital image processing method of moire fringes by using Fourier transform is discussed. The researches show that laser moire deflectometry can meet needs of mini/micro-scale flow visualization for measurement sensitivity and high spatial resolution. The measurement of mini/micro-scale temperature field for natural convection of a heated thin wire is experimentally demonstrated by means of the laser moire deflectometry.

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Flow Visualization

Cited by 38 publications

References 2 publications

Experimental Investigation of Primary and Secondary Features in High-Mach-Number Shock-Bubble Interaction

Experimental Investigation of Primary and Secondary Features in High-Mach-Number Shock-Bubble Interaction

Microscale imaging of cilia-driven fluid flow

Laser moire deflectometry applicable for mini/micro-scale flow visualization

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