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Experimental investigation of turbulent diffusion of slightly buoyant droplets in locally isotropic turbulence
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10.1063/1.2969470
/content/aip/journal/pof2/20/9/10.1063/1.2969470
http://aip.metastore.ingenta.com/content/aip/journal/pof2/20/9/10.1063/1.2969470

Figures

Image of FIG. 1.
FIG. 1.

Turbulence generating facility with the optical setup of one view digital holography.

Image of FIG. 2.
FIG. 2.

Mean vertical velocity distribution in the central plane at .

Image of FIG. 3.
FIG. 3.

Distributions of (a) (cm/s) and (b) (cm/s) in the central plane at .

Image of FIG. 4.
FIG. 4.

A sample (a) 2D projection and (b) 3D matched droplet tracks with grayscale showing velocity magnitude.

Image of FIG. 5.
FIG. 5.

Sample ensemble-averaged droplet Lagrangian velocity autocorrelations at .

Image of FIG. 6.
FIG. 6.

Fluid and droplet (different sizes) horizontal diffusion coefficients as a function of time for (a) (low ) and (b) (high ).

Image of FIG. 7.
FIG. 7.

Sample Lagrangian kinetic energy spectra of fluid particles for , showing the presence of inertial scale with a slope.

Image of FIG. 8.
FIG. 8.

Mean vertical displacement of a 0.7 mm droplet at .

Image of FIG. 9.
FIG. 9.

Droplet mean rise velocity normalized by the quiescent rise velocity as a function of Stokes number. The corresponding are 190, 195, and 214.

Image of FIG. 10.
FIG. 10.

Droplet mean rise velocity compared to the results of Friedman and Katz (Ref. 18).

Image of FIG. 11.
FIG. 11.

Sample PDF of droplet horizontal and vertical velocities for (a) 0.75 mm droplets and (b) 1.05 mm droplets compared to PDF of fluid particles and Gaussian distribution at .

Image of FIG. 12.
FIG. 12.

Droplet (a) horizontal and (b) vertical rms velocities, normalized by corresponding rms values of fluid velocity.

Image of FIG. 13.
FIG. 13.

Variations, with , of the droplet velocity fluctuations normalized by corresponding fluid velocity fluctuations.

Image of FIG. 14.
FIG. 14.

Variation of normalized (a) horizontal and (b) vertical diffusion coefficients with normalized turbulence intensity.

Image of FIG. 15.
FIG. 15.

Comparison of Lagrangian fluid diffusion timescale in horizontal and vertical directions with the rotation time of the mixer.

Image of FIG. 16.
FIG. 16.

Variations, with , of the droplet horizontal and vertical diffusion coefficients normalized by in (a) linear and (b) log scales.

Image of FIG. 17.
FIG. 17.

Droplet horizontal and vertical diffusion coefficients normalized by the corresponding fluid diffusion coefficients.

Image of FIG. 18.
FIG. 18.

Droplet horizontal and vertical diffusion time scales normalized by the corresponding fluid diffusion time scales.

Image of FIG. 19.
FIG. 19.

Sample droplet horizontal dispersion (mean square displacement) at .

Tables

Generic image for table
Table I.

Turbulence parameters for the three mixer rpm’s

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/content/aip/journal/pof2/20/9/10.1063/1.2969470
2008-09-02
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental investigation of turbulent diffusion of slightly buoyant droplets in locally isotropic turbulence
http://aip.metastore.ingenta.com/content/aip/journal/pof2/20/9/10.1063/1.2969470
10.1063/1.2969470
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