Visualization of water flow by sugar schlieren

Peters, F.; Kuralt, T.; Schniderjan, J.

doi:10.1007/bf00187313

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…The schlieren system, invented by Robert Hooke in the 17th century, was developed as a visualization technique in the 19th century by Toepler [1]. Since then, the technique has been applied widely to tackle different kinds of problems in many research areas, such as combustion [2,3], aerodynamics [4,5], fluid mechanics [6,7], etc. Recently, a background oriented schlieren technique [8,9] and a novel 'synthetic schlieren' technique [10] have been developed both for qualitative visualization and quantitative measurements.…”

Section: Introductionmentioning

confidence: 99%

High speed stereoscopic shadowgraph imaging and its digital 3D reconstruction

Wang¹,

ZHANG²

2011

Meas. Sci. Technol.

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A stereoscopic shadowgraph system has been developed based on the conventional z-type schlieren configuration. The test volume is set at the intersection of two inclined converging beams formed by two pairs of parabolic mirrors. Two synchronized high speed cameras are applied to record the shadowgraph image pairs simultaneously. A precisely etched metal mesh plate is used to calibrate the stereoscopic shadowgraph system. By combining the calibration parameters and coordinates of the matching points in stereo images, the depth information and the 3D view of the shadowgraph images are obtained. A crystal block with internal 3D images created by laser etching is used as a model for static object reconstruction and validation. The 3D coordinates obtained by the digital 3D reconstruction are in good agreement with the real dimensions. The developed stereoscopic technique is then applied to investigate the bursting dynamics of a bubble. The time resolved bubble-bursting process has been reconstructed successfully. The quantitative velocity measurement reveals that the bubble collapses at a constant velocity of around 7 m s−1, which corresponds to a high Weber number. As a result, finger-like structures are observable around the rim of the collapsing bubble. The stereoscopic shadowgraph technique has been shown to be effective for 3D visualization and quantitative measurement.

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Section: Introductionmentioning

confidence: 99%

High speed stereoscopic shadowgraph imaging and its digital 3D reconstruction

Wang¹,

ZHANG²

2011

Meas. Sci. Technol.

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Smartphone schlieren and shadowgraph imaging

Settles¹

2018

Optics and Lasers in Engineering

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Simple method of supersonic flow visualization using watertable

Pal

Bose

1995

AIAA Journal

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26)where K T = (Af£, -1)5 /e 2 A5 C^p is a transonic viscous interaction parameter. In the K T ^> 1 limit, Eq. (26) reduces to Eq. (10) for higher Mach number supersonic flow. Now, numerical studies of this modified transonic triple-deck problem have shown 15 that the value of p Ls , changes very little over a wide range of K T values: for K T > 1, we may thus continue to use the incipient separation criterion Eq. (14). Then with d<5*/djc = K d 9 Ls , 9 inversion of Eq. (22) followed by conversion back to physical variables yields 1-1.030/ (27) This is the desired extension of Eq. (19) to include the transonic regime. Although a bit complicated, it reveals the correct underlying scaling behavior while passing over to the simpler form of Eq. (19) for sufficiently small values of x -In. this regard we note that Eq. (27) is, in fact, a unified scaling law for the entire supersonic regime from transonic to moderately hypersonic.

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Visualization of water flow by sugar schlieren

Cited by 3 publications

References 3 publications

High speed stereoscopic shadowgraph imaging and its digital 3D reconstruction

High speed stereoscopic shadowgraph imaging and its digital 3D reconstruction

Smartphone schlieren and shadowgraph imaging

Simple method of supersonic flow visualization using watertable

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