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Direct measurement of slip flows in superhydrophobic microchannels with transverse grooves
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10.1063/1.3026609
/content/aip/journal/pof2/20/11/10.1063/1.3026609
http://aip.metastore.ingenta.com/content/aip/journal/pof2/20/11/10.1063/1.3026609

Figures

Image of FIG. 1.
FIG. 1.

Schematics and pictures of the glass microchannel and the PDMS microchannel.

Image of FIG. 2.
FIG. 2.

Fabrication process of the anisotropically superhydrophobic PDMS microchannel with transverse microgrooves on the vertical walls.

Image of FIG. 3.
FIG. 3.

SEM images of the silicon molders for the grooved superhydrophobic surfaces and the measurement of contact angles on the grooved PDMS superhydrophobic surfaces.

Image of FIG. 4.
FIG. 4.

Picture of the superhydrophobic microchannel (top view).

Image of FIG. 5.
FIG. 5.

Experimental microparticle image velocimetry (micro-PIV) setup.

Image of FIG. 6.
FIG. 6.

Schematic of the microchannel (top view) showing the PIV measurement plane and the raw images in the glass, PDMS and the grooved PDMS microchannels.

Image of FIG. 7.
FIG. 7.

Liquid meniscus on the microstructured surface with air gap in the valley between the grooves. (a) Schematic of the microscale grooves. (b) Flow in the microchannel with grooves of width , height , and pitch . (c) Flow in the microchannel with grooves of width , height , and pitch . Flow rates are for both.

Image of FIG. 8.
FIG. 8.

Ensemble-averaged velocity vector field measured in the glass, PDMS, and the superhydrophobic PDMS microchannels. (a) Glass microchannel, (b) PDMS microchannel, (c) superhydrophobic PDMS microchannel with a groove width of and pitch of , and (d) superhydrophobic PDMS microchannel with a groove width of and pitch of .

Image of FIG. 9.
FIG. 9.

Normalized velocity profiles for flow over the hydrophilic glass, hydrophobic PDMS, and the superhydrophobic PDMS microchannels.

Image of FIG. 10.
FIG. 10.

Sequential images of wetting transition for various pitches in the superhydrophobic microchannel.

Tables

Generic image for table
Table I.

Geometric parameters of the groove and the wetting transition.

Generic image for table
Table II.

Slip length on a surface of the groove structure in the superhydrophobic microchannel.

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/content/aip/journal/pof2/20/11/10.1063/1.3026609
2008-11-25
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct measurement of slip flows in superhydrophobic microchannels with transverse grooves
http://aip.metastore.ingenta.com/content/aip/journal/pof2/20/11/10.1063/1.3026609
10.1063/1.3026609
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