Turbulence generating facility with the optical setup of one view digital holography.
Mean vertical velocity distribution in the central plane at .
Distributions of (a) (cm/s) and (b) (cm/s) in the central plane at .
A sample (a) 2D projection and (b) 3D matched droplet tracks with grayscale showing velocity magnitude.
Sample ensemble-averaged droplet Lagrangian velocity autocorrelations at .
Fluid and droplet (different sizes) horizontal diffusion coefficients as a function of time for (a) (low ) and (b) (high ).
Sample Lagrangian kinetic energy spectra of fluid particles for , showing the presence of inertial scale with a slope.
Mean vertical displacement of a 0.7 mm droplet at .
Droplet mean rise velocity normalized by the quiescent rise velocity as a function of Stokes number. The corresponding are 190, 195, and 214.
Droplet mean rise velocity compared to the results of Friedman and Katz (Ref. 18).
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 .
Droplet (a) horizontal and (b) vertical rms velocities, normalized by corresponding rms values of fluid velocity.
Variations, with , of the droplet velocity fluctuations normalized by corresponding fluid velocity fluctuations.
Variation of normalized (a) horizontal and (b) vertical diffusion coefficients with normalized turbulence intensity.
Comparison of Lagrangian fluid diffusion timescale in horizontal and vertical directions with the rotation time of the mixer.
Variations, with , of the droplet horizontal and vertical diffusion coefficients normalized by in (a) linear and (b) log scales.
Droplet horizontal and vertical diffusion coefficients normalized by the corresponding fluid diffusion coefficients.
Droplet horizontal and vertical diffusion time scales normalized by the corresponding fluid diffusion time scales.
Sample droplet horizontal dispersion (mean square displacement) at .
Turbulence parameters for the three mixer rpm’s
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