| Issue |
Europhys. Lett.
Volume 55, Number 6, September II 2001
|
|
|---|---|---|
| Page(s) | 807 - 813 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics and fluid mechanics | |
| DOI | https://doi.org/10.1209/epl/i2001-00352-3 | |
| Published online | 01 December 2003 | |
Double-diffusive fingering instability of a surfactant-glycerine-water drop in water
Max-Planck-Institut für molekulare Physiologie -
Postfach 500247 D-44202 Dortmund, Germany
Received:
2
November
2000
Accepted:
28
June
2001
We present an experimental setup that allows easy visualization of single fingers formed by double diffusive convection. This setup consists of a drop (containing water and two solutes) that is injected at the bottom of a dish filled with water. The gravity-driven expansion of the drop induces a toroidal bulk flow of the surrounding water. This flow straightens and confines the fingers horizontally and quasi–two-dimensionally. An extremely low diffusion coefficient of one of the two solutes (a surfactant in our case) causes unusually stable configurations. This stability is robust within a wide range of concentrations. Wavelength measurements agree well with theoretical estimations.
PACS: 47.54.+r – Pattern selection; pattern formation / 47.20.Bp – Buoyancy-driven instability / 66.10.Cb – Diffusion and thermal diffusion
© EDP Sciences, 2001
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