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Lattice Boltzmann numerical simulation and experimental research of dynamic flow in an expansion-contraction microchannel
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10.1063/1.4812456
/content/aip/journal/bmf/7/3/10.1063/1.4812456
http://aip.metastore.ingenta.com/content/aip/journal/bmf/7/3/10.1063/1.4812456

Figures

Image of FIG. 1.
FIG. 1.

Schematic view of the microchannel (unit: m). (a) Median horizontal plane and (b) cross-section at the outlet of the microchannel.

Image of FIG. 2.
FIG. 2.

Velocity (contour legend) and streamlines under various flow rates (yellow arrows point to the vortex centers): (a) 50 l/min; (b) 150 l/min; (c) 250 l/min; (d) 350 l/min; (e) 450 l/min; (f) 550 l/min; and (g) 650 l/min.

Image of FIG. 3.
FIG. 3.

Evolution of the vortex center and -velocity distributions under different flow rates. (a) Vortex centers under different flow rates (unit: l/min). (b) -velocity distribution along orange dash lines passing through each vortex center in (a), and the boundaries between the vortex and main flow in each curve are located between the blue dash lines. (c) -velocity distribution extracted from the blue box in (b).

Image of FIG. 4.
FIG. 4.

Evolution of flow field in cavities with different dimensions: (a)–(f) cavities with 700-200 m widths and 300 m length; (g) and (h) cavities with 300 m width and 200–100 m lengths. The inlet flow rate is 150 l/min in these simulations.

Image of FIG. 5.
FIG. 5.

Total velocity (contour legend) and cross-section velocity distribution (arrows) under various flow rates: (a) 50 l/min; (b) 150 l/min; (c) 250 l/min; (d) 350 l/min; (e) 450 l/min; (f) 550 l/min; and (g) 650 l/min.

Image of FIG. 6.
FIG. 6.

Dean flow velocity distribution over the cross-section under various flow rates: (a) -velocity distribution along the vertical center line of the cross-section and (b) -velocity distribution along the horizontal center line of the cross-section.

Image of FIG. 7.
FIG. 7.

Schematic diagram of experimental setup. (a) A microscope image of the first rectangular cavity in the microchannel and (b) a photo of the microfluidic device.

Image of FIG. 8.
FIG. 8.

Microscope images of the flow patterns in the rectangular cavity. (a)–(g) Microscope images of the flow patterns in the rectangular cavity and corresponding 3D surface plot of grey scale under flow rate as 50 l/min–650 l/min (yellow arrows point to estimated vortex centers). (h) Comparison diagram of vortex centers from the simulation and experiment, respectively (unit: l/min).

Tables

Generic image for table
Table I.

Parameters selection under different volumetric flow rates.

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/content/aip/journal/bmf/7/3/10.1063/1.4812456
2013-06-26
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Lattice Boltzmann numerical simulation and experimental research of dynamic flow in an expansion-contraction microchannel
http://aip.metastore.ingenta.com/content/aip/journal/bmf/7/3/10.1063/1.4812456
10.1063/1.4812456
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