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Inertial particle trapping in viscous streaming
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10.1063/1.4795857
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Affiliations:
1 Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, California 90095, USA
2 Mechanical Engineering and Engineering Science, The University of North Carolina at Charlotte, Charlotte, North Carolina 28223, USA
a) Author to whom correspondence should be addressed. Electronic mail: eldredge@seas.ucla.edu
Phys. Fluids 25, 033602 (2013)
/content/aip/journal/pof2/25/3/10.1063/1.4795857
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/3/10.1063/1.4795857

## Figures

FIG. 1.

(a) Lagrangian streamlines (top half) and instantaneous Stokes-layer vorticity (bottom half) of canonical streaming pattern for and (here, ). (b) Streaming regimes (adapted from Wang).

FIG. 2.

Inertial particle trajectory (solid line) and trajectory sampled once per cycle (shown as dots) for = 40, / = 0.175, and ρ = 1.

FIG. 3.

Panels (a)–(c) Inertial particles trajectories (in dark gray, or blue), sampled once per cycle, for = 40, / = 0.175. Initial locations depicted with circles. Lagrangian streamlines are depicted in light gray. (a) ρ = 1.05, (b) 1, (c) 0.95. In (b), square symbols denote the instants / = 290 and 350. (d) Inertial (dark gray, or red) and fluid (light gray, or green) particle trajectories over one oscillation cycle, / ∈ [317, 318] for ρ = 1. Arrows depict the total hydrodynamic force vectors in Eq. . Dots denote inertial particle trajectory sampled once per cycle.

FIG. 4.

Comparison of trapping position from current results (squares) and experiments (circles) of Lutz, Chen, and Schwartz. Dashed and solid lines depict, respectively, inner streaming cell size δ/ and inner streaming cell center location.

FIG. 5.

Illustration of the tendency of a inertial particle to deviate from a Lagrangian streamline. Note that α < 0 in the upper right portion of the streamline, and α > 0 in the lower left portion.

FIG. 6.

(a) History of α during the cycle / ∈ [290, 350] for = 40, / = 0.175, ρ = 1. (b) Contributions to dα/d from each term in Eq. : Stokes drag (solid black); convective term (dashed, cyan); Basset history (dashed-dotted, magenta); Saffman lift (dashed-dotted-dotted, blue); Faxén corrections (dotted, green); (solid light gray, or yellow).

FIG. 7.

Hydrodynamic force (arrows) at sampled times along the inertial particle trajectory (dark solid line) during the intervals / ∈ [0, 485] and / ∈ [1300, 1370] for = 40, / = 0.175 and ρ = 1. All portions of the inertial particle trajectory not in these intervals are shown as a light gray line.

FIG. 8.

Saffman lift force (black arrow), relative particle velocity, (light gray arrow, or green), and local profile of fluid velocity, , perpendicular to (gray arrows, or blue) at / = 317.5 and / = 318. Velocity vectors are plotted with the same scale. Solid line (red) denotes the inertial particle trajectory during the oscillation cycle / ∈ [317, 318]. Local fluid particle trajectory, sampled once per period, shown with dots.

FIG. 9.

The final limit cycle for inertial particles of various sizes: / = 0.1 (blue); / = 0.115 (red); / = 0.13 (green); / = 0.145 (cyan); / = 0.16 (black); / = 0.175 (magenta), each plotted over one cycle for , ρ = 1. Mean Lagrangian streamlines shown in light gray for reference.

FIG. 10.

(a) The sampled history of the position of an inertial particle (- - -) and an exponential fit to the envelope (—), for , ρ = 1, and / = 0.175. (b) Trapping timescale dependence on /, for , ρ = 1. This figure contains results for (green triangles), 0.2 (blue circles), 0.1 (red squares). (c) Trapping timescale dependence on ρ for , / = 0.175. (d) Trapping timescale dependence on for ρ = 1, with / varied so that Ω /ν is fixed at 1.2.

FIG. 11.

Inertial particle trajectories at for particle of density ρ = 1 and radius / = 0.175, initially located at (1.2, 1.2) (circle), (1.8, 1.8) (square), (2, 2) (triangle), (2.2, 2.2) (diamond). Lagrangian streamlines are in light gray.

FIG. 12.

(a) Mean Eulerian streamlines, and (b) mean Lagrangian streamlines, for .

## Tables

Table I.

Time averaged forces applied on the inertial particle during the interval / ∈ [4200, 4700] for = 40, / = 0.175, ρ = 1.

/content/aip/journal/pof2/25/3/10.1063/1.4795857
2013-03-28
2014-04-20

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