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Passive flow control in microdevices using thermally responsive polymer solutions
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10.1063/1.2204077
/content/aip/journal/pof2/18/5/10.1063/1.2204077
http://aip.metastore.ingenta.com/content/aip/journal/pof2/18/5/10.1063/1.2204077
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online). Viscosity of Pluronic F127 solutions at different concentrations as a function of temperature from cone and plate viscometry at controlled shear stress .

Image of FIG. 2.
FIG. 2.

(Color online). Gel formation temperature for Pluronic F68 and F127 as a function of concentration from cone and plate viscometry at controlled shear stress .

Image of FIG. 3.
FIG. 3.

(Color online). Apparent viscosity of Pluronic F127 at as a function of temperature for different constant shear rates in a rotational rheometer.

Image of FIG. 4.
FIG. 4.

(Color online). Pressure drop vs time for a Pluronic F127 solution at varying flow rate through a 10-mm-long microchannel with rectangular cross section at .

Image of FIG. 5.
FIG. 5.

Pressure drop as a function of flow rate for a Pluronic F127 solution through a 10-mm-long microchannel with rectangular cross section at different temperatures, (a) below or near the gel point and (b) significantly above the gel point; the error bars ( standard deviation) are barely visible.

Image of FIG. 6.
FIG. 6.

(Color online). At an ambient temperature , flow of a Pluronic F127 solution at a constant volumetric flow rate through a microchannel induces viscous heating, which causes gel formation until the channel is closed. As a result, the pressure drop along the channel increases until cooling of the channel with ice transforms the gel back into a liquid phase.

Image of FIG. 7.
FIG. 7.

Velocity profiles from DPIV of a Pluronic F127 solution through a microchannel with a cross-sectional area of at different ambient temperatures, , 21.0, 22.6, and .

Image of FIG. 8.
FIG. 8.

(Color online). Average velocity over time of a pressure-driven flow of Pluronic F127 solution in a microchannel with cross sectional area at different ambient temperatures, , 21.0, 22.6, and , normalized by the corresponding average velocity; the bold line corresponds to the 11-point moving average of the flow velocity.

Image of FIG. 9.
FIG. 9.

(Color online). Normalized standard deviation of the velocity fluctuations as a function of temperature for pressure-driven flow of a Pluronic F127 solution in a microchannel with cross-sectional area of .

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/content/aip/journal/pof2/18/5/10.1063/1.2204077
2006-05-31
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Passive flow control in microdevices using thermally responsive polymer solutions
http://aip.metastore.ingenta.com/content/aip/journal/pof2/18/5/10.1063/1.2204077
10.1063/1.2204077
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