Schematic view of the microchannel (unit: μm). (a) Median horizontal plane and (b) cross-section at the outlet of the microchannel.
Velocity (contour legend) and streamlines under various flow rates (yellow arrows point to the vortex centers): (a) 50 μl/min; (b) 150 μl/min; (c) 250 μl/min; (d) 350 μl/min; (e) 450 μl/min; (f) 550 μl/min; and (g) 650 μl/min.
Evolution of the vortex center and x-velocity distributions under different flow rates. (a) Vortex centers under different flow rates (unit: μl/min). (b) x-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) x-velocity distribution extracted from the blue box in (b).
Evolution of flow field in cavities with different dimensions: (a)–(f) cavities with 700-200 μm widths and 300 μm length; (g) and (h) cavities with 300 μm width and 200–100 μm lengths. The inlet flow rate is 150 μl/min in these simulations.
Total velocity (contour legend) and cross-section velocity distribution (arrows) under various flow rates: (a) 50 μl/min; (b) 150 μl/min; (c) 250 μl/min; (d) 350 μl/min; (e) 450 μl/min; (f) 550 μl/min; and (g) 650 μl/min.
Dean flow velocity distribution over the cross-section under various flow rates: (a) y-velocity distribution along the vertical center line of the cross-section and (b) x-velocity distribution along the horizontal center line of the cross-section.
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.
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 μl/min–650 μl/min (yellow arrows point to estimated vortex centers). (h) Comparison diagram of vortex centers from the simulation and experiment, respectively (unit: μl/min).
Parameters selection under different volumetric flow rates.
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