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Droplet collisions and interaction with the turbulent flow within a two-phase wind tunnel
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10.1063/1.3609275
/content/aip/journal/pof2/23/8/10.1063/1.3609275
http://aip.metastore.ingenta.com/content/aip/journal/pof2/23/8/10.1063/1.3609275

Figures

Image of FIG. 1.
FIG. 1.

Göttingen-type two-phase wind tunnel with closed test section. The test section is shown in more details in Fig. 2

Image of FIG. 2.
FIG. 2.

Optically accessible test section with passive grid and bluff body, showing coordinate system and measurement planes (left) and the applied two-fluid atomizing nozzle with six orifices (right).

Image of FIG. 3.
FIG. 3.

Droplet size distribution (DSD) and corresponding log-normal distribution function at x = 0, y = − 5, z = 90, measured by PDA.

Image of FIG. 4.
FIG. 4.

Illustration of configurations M1M4, respectively.

Image of FIG. 5.
FIG. 5.

Convergence of the arithmetic mean and volume mean diameters measured by PDA as a function of the number of samples at a chosen measurement point. The volume mean diameter converges for around 8000 samples.

Image of FIG. 6.
FIG. 6.

Mean droplet diameter profile across the measurement section at x; = 0, z; = 0, measured by means of PDA.

Image of FIG. 7.
FIG. 7.

Mean axial velocity profile of the droplets across the measurement section at x = 0, z = 0, measured by means of LDV.

Image of FIG. 8.
FIG. 8.

(Color) Mean axial velocity distribution of the air phase at x = 0, measured by means of LDV.

Image of FIG. 9.
FIG. 9.

(Color) Mean turbulence intensity distribution of the air phase in x-direction at x = 0, measured by means of LDV.

Image of FIG. 10.
FIG. 10.

(Color) Mean axial velocity of the droplets at x = 0, measured by means of PDA, for configuration M1, M2, M3, and M4, respectively (from top to bottom).

Image of FIG. 11.
FIG. 11.

(Color) Droplet number density per unit volume in droplet cm−3 at x = 0 calculated from the PDA results as described by Roisman and Tropea.55

Image of FIG. 12.
FIG. 12.

Change in mean and volume mean diameter (averaged over the cross section) of the droplets along the x-axis for configuration M3, measured by means of PDA and showing the increase in mean droplet size.

Image of FIG. 13.
FIG. 13.

Example of a collision event at x = 0, z = 140 of configuration M3, measured by means of Shadowgraphy.

Image of FIG. 14.
FIG. 14.

Comparison of calculated (theoretical) and measured (experimental) collision rate for a z-profile at x = 0, y = 150 mm for Configuration M4.

Tables

Generic image for table
Table I.

Typical values observed within cumulus clouds compared to that found in the wind tunnel.

Generic image for table
Table II.

Measured averaged flow and turbulence parameters for all configurations in the wind tunnel at the entrance of the test section (x = 0).

Generic image for table
Table III.

Quantities measured by PDA and needed for a theoretical estimation of collision probabilities, compared to the collision probability measured by Shadowgraphy for x = 0 at different z -values for Configuration M3.

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/content/aip/journal/pof2/23/8/10.1063/1.3609275
2011-08-17
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Droplet collisions and interaction with the turbulent flow within a two-phase wind tunnel
http://aip.metastore.ingenta.com/content/aip/journal/pof2/23/8/10.1063/1.3609275
10.1063/1.3609275
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