![]() ![]() The transition from plug flow provided the yield stress of the hydrogel, which was found to be consistent with velocity data collected over the 0.1–200 s −1 apparent shear rate range of steady torsional and capillary flows. The steady torsional flow of the hydrogel was dominated by wall slip which gave rise to plug flow over the apparent shear rate range of 0.1 to 1 s −1, in agreement with the plug flow observed in the capillary under similar shear stresses. Transparent disks and capillaries fabricated out of borosilicate glass were used to allow velocity measurements. % aqueous solution of poly(acrylic acid) was analyzed employing steady torsional and circular tube (capillary) flows. The coupled apparent slip and viscoplastic behavior of a hydrogel consisting of 0.2 wt.
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