File:Mixing in Porous Medium.jpg
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editDescriptionMixing in Porous Medium.jpg |
English: Two fluorescent dyes are injected into stationary upward water flow inside three-dimensional porous medium made of a random stack of solid transparent beads of diameter 16 mm (the planar cross-sections of the spherical beads are seen as black circles on the image). Based on this single photograph, the evolution of the dye concentrations and their interaction rules in the porous medium have been deciphered and explained (Kree and Villermaux, Physical Review Fluids, 2, 104502). Technical/scientific details (see the paper for further details): 1) The porous medium is made transparent by matching the refraction indices of water and the beads; 2) The fluorescent dyes are made visible only at the central plane of the 3D medium using a planar laser sheet, elsewhere the dyes remain transparent; 3) The stationary (time-independent) flow leads to efficient mixing due to high velocity gradients resulting from no-slip boundary conditions at the surfaces of the beads; 4) Any residual correlation of the initially merged distinct dyes is progressively hidden, leading to an effective fully random interaction rule of the two distinct subfields, manifested by a Beta distribution of the mixing ratio. |
Date | |
Source | Own work |
Author | Mihkel Kree |
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This image was uploaded as part of Wiki Science Competition 2017. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:54, 15 December 2017 | 1,340 × 2,746 (1.15 MB) | Mihkelk (talk | contribs) | User created page with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon EOS 40D |
Exposure time | 1/50 sec (0.02) |
F-number | f/3.2 |
ISO speed rating | 200 |
Date and time of data generation | 17:52, 14 November 2012 |
Lens focal length | 100 mm |
Horizontal resolution | 240 dpi |
Vertical resolution | 240 dpi |
Software used | Adobe Photoshop Lightroom 6.10 (Macintosh) |
File change date and time | 18:20, 30 November 2017 |
Exposure Program | Manual |
Exif version | 2.3 |
Date and time of digitizing | 17:52, 14 November 2012 |
APEX shutter speed | 5.643856 |
APEX aperture | 3.356144 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Subject distance | 1.85 meters |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
DateTimeOriginal subseconds | 01 |
DateTimeDigitized subseconds | 01 |
Color space | sRGB |
Focal plane X resolution | 4,438.3561643836 |
Focal plane Y resolution | 4,445.9691252144 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Serial number of camera | 720525120 |
Lens used | EF100mm f/2.8L Macro IS USM |
Date metadata was last modified | 20:20, 30 November 2017 |
Unique ID of original document | xmp.did:af690ef1-4b4a-4378-9db8-a98e2b294ce8 |
IIM version | 4 |