Journal
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
Volume -, Issue 112, Pages -Publisher
JOURNAL OF VISUALIZED EXPERIMENTS
DOI: 10.3791/53599
Keywords
Engineering; Issue 112; particles in turbulence; anisotropic particles; turbulence; 3D printing; rotation; fluid dynamics
Categories
Funding
- NSF [DMR-1208990]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1208990] Funding Source: National Science Foundation
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Experimental methods are presented for measuring the rotational and translational motion of anisotropic particles in turbulent fluid flows. 3D printing technology is used to fabricate particles with slender arms connected at a common center. Shapes explored are crosses (two perpendicular rods), jacks (three perpendicular rods), triads (three rods in triangular planar symmetry), and tetrads (four arms in tetrahedral symmetry). Methods for producing on the order of 10,000 fluorescently dyed particles are described. Time-resolved measurements of their orientation and solid-body rotation rate are obtained from four synchronized videos of their motion in a turbulent flow between oscillating grids with R-lambda = 91. In this relatively low-Reynolds number flow, the advected particles are small enough that they approximate ellipsoidal tracer particles. We present results of time-resolved 3D trajectories of position and orientation of the particles as well as measurements of their rotation rates.
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