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Transient micromixing: Examples of laminar and chaotic stirring
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View: Figures


Image of FIG. 1.
FIG. 1.

Operation of an idealized annular micromixer at three times.

Image of FIG. 2.
FIG. 2.

Annular geometry showing the centerline radius and the channel half-width .

Image of FIG. 3.
FIG. 3.

Mixing measure as a function of nondimensional time, calculated in numerical simulations with and various Peclet numbers as shown. The asymptotic result (20) for is also shown with a dotted curve, almost indistinguishable from the numerical result.

Image of FIG. 4.
FIG. 4.

Nondimensional mixing times as a function of Peclet number for . Asymptotic results are shown as lines, and numerical results as symbols for values of the mixing measure: (dashed line, squares), (solid line, points), and (dotted line, triangles). The asymptotic result (23) is applied to the and cases, while the long-time version (25) is needed in the well-mixed situation.

Image of FIG. 5.
FIG. 5.

Poincaré section of the standard map (26) . Note the -periodic variable is shown over the range to highlight the central island. Initial condition 1 of the mixing problem has the solute distributed uniformly inside the dashed rectangle, with the solid rectangle bounding initial condition 2.

Image of FIG. 6.
FIG. 6.

Concentration density for initial condition 1 (left column) and condition 2 (right column). (a) Initial conditions, (b) , (c) , (d) , (e) . The highest concentration values in each picture are white, and lowest are black. Note the stirring effect within the island in the left column of (c) and (d).

Image of FIG. 7.
FIG. 7.

Mixing measure for the noisy standard map. Filled symbols are for initial condition 1 (which intersects the quasiperiodic island); open circles are for initial condition 2. Note the exponential decay of condition 1 between and —the rate of decay is faster than (subdominant to) the final exponential decay, but nevertheless has a strong impact on the mixing measure.

Image of FIG. 8.
FIG. 8.

Mixing measures for initial condition 1, for various Peclet numbers from 555 to . The Peclet number increases moving upwards among the curves. Exponential fits within the stirring interval are shown, the scaling of these fits is shown in Fig. 9 .

Image of FIG. 9.
FIG. 9.

Scaling of the exponential fits to the curves. The triangles correspond to the stirring interval; the squares show the scaling of the long-time exponential decay rate. The fitted lines correspond to scalings of (triangles) and (squares).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Transient micromixing: Examples of laminar and chaotic stirring