2011
DOI: 10.1119/1.3536647
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Using particle tracking to measure flow instabilities in an undergraduate laboratory experiment

Abstract: A compact apparatus for muon lifetime measurement and time dilation demonstration in the undergraduate laboratory Am.Much of the drama and complexity of fluid flow occurs because its governing equations lack unique solutions. The observed behavior depends on the stability of the multitude of solutions, which can change with the experimental parameters. Instabilities cause sudden global shifts in behavior. We have developed a low-cost experiment to study a classical fluid instability. By using an electromagneti… Show more

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Cited by 85 publications
(56 citation statements)
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“…Standard probes are not rated for temperatures above 250 °C, excluding their use in many metal melts. Ultrasound velocimetry does not produce data sets as rich as those available using optical techniques like particle tracking 24,25 , and single-transducer ultrasound techniques of the sort described here measure only one component of the velocity, and only along one line. Features smaller than the ultrasound wavelength (209 µm in ePbBi at 150 °C with 8 MHz emissions) cannot be resolved.…”
Section: Discussionmentioning
confidence: 99%
“…Standard probes are not rated for temperatures above 250 °C, excluding their use in many metal melts. Ultrasound velocimetry does not produce data sets as rich as those available using optical techniques like particle tracking 24,25 , and single-transducer ultrasound techniques of the sort described here measure only one component of the velocity, and only along one line. Features smaller than the ultrasound wavelength (209 µm in ePbBi at 150 °C with 8 MHz emissions) cannot be resolved.…”
Section: Discussionmentioning
confidence: 99%
“…1b), we perform free-surface visualization. Lagrangian surface velocities are measured using a particles tracking code 33 . We follow the surface motions of 90 black floating particles taken to be smaller than the dynamical flow scales (3 mm diameter spherical particles) and to be at the same density as the carrier fluid (for better optical contrast, the water is tinted white via a titanium dioxide suspension).…”
Section: Experimental Data Acquisitionmentioning
confidence: 99%
“…Each magnet produces a field with a maximum amplitude of about 0.3 T that decays exponentially with the axial distance from the magnet surface, dropping to half the maximum in 3.3 mm. 22 A pair of bar electrodes are mounted on opposite ends of the layer, allowing an electric current to be passed through the salt water. The current and magnetic field produce a Lorentz body force F = J ϫ B / , where J is the current density and B is the magnetic field, on the fluid that drives flow.…”
Section: Experimental Flow and Particle Trackingmentioning
confidence: 99%