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Pearl and mushroom instability patterns in two miscible fluids' core annular flows
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10.1063/1.2838582
/content/aip/journal/pof2/20/2/10.1063/1.2838582
http://aip.metastore.ingenta.com/content/aip/journal/pof2/20/2/10.1063/1.2838582
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Sketch of the injection device used to implement core annular flow. The cylindrical tube (of length and radius) surrounds a concentric smaller tube (of inner radius ). The core fluid is injected into the smaller tube and the wall fluid is injected into the annular volume surrounding the small tube. The core flow converges towards a parallel flow over a viscous entry length, .

Image of FIG. 2.
FIG. 2.

Typical flow geometry near the injection plane. Depicted is the typical length, , beyond which the parallel core flow destabilizes.

Image of FIG. 3.
FIG. 3.

Patterns observed at and for different values of increasing from top to bottom . The sequence shows the evolution from a pearl-like to a mushroom-like pattern.

Image of FIG. 4.
FIG. 4.

Time evolution of one particular pearl-like pattern, traveling at about , at and . Time increases from left to right and from top to bottom. Notice the bursts of the wall fluid which propagate through the traveling pattern and exhibit a kind of umbrella inversion.

Image of FIG. 5.
FIG. 5.

Patterns observed at and for different values of increasing from top to bottom . The sequence shows the evolution from a pearl-like to a mushroom-like pattern.

Image of FIG. 6.
FIG. 6.

Domain of occurrence of the two patterns in the plane. Mushroom-like patterns (▴) are obtained at large or ; pearl-like patterns (●) correspond to smaller and . The empty symbol (○) denotes the coexistence of the two patterns in the same experiment.

Image of FIG. 7.
FIG. 7.

Normalized pattern wavelength, vs , for [(●): pearls, (▴): mushrooms].

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/content/aip/journal/pof2/20/2/10.1063/1.2838582
2008-02-14
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pearl and mushroom instability patterns in two miscible fluids' core annular flows
http://aip.metastore.ingenta.com/content/aip/journal/pof2/20/2/10.1063/1.2838582
10.1063/1.2838582
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