Abstract
Experimental study is conducted on a squeezing flow of the aqueous solution of hydroxypropylcellulose (HPC) chosen as a lyotropic liquid crystalline polymer. The squeezing flow is started after stopping a pre-shear radial flow spreading between two parallel circular plates from a central hole. Flow patterns are visualized with crossed polarizers under. various combinations of the pre-shear flow, a pause time taken between these two flows and squeezing velocity. Forces transmitted through the liquid film are simultaneously measured, and the followings are obtained. Even if the squeezing motion is the same, the pre-shear deformation and the pause time give great influence on the flow patterns of the 50% HPC solution. The responses in the force generated in the squeezing flow are correlated with the flow patterns observed.
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