Abstract
Mechanism of the occurrence of the wavy texture in slit flows of liquid crystalline polymer (LCP) solutions is studied in pressure-driven start-up flows using 50wt%, 55wt% and 60wt% aqueous solutions of hydroxypropylcellulose (HPC). The average shear strain at the onset of the wavy texture is examined in the flows through slit cells with various entrance geometries. The concentration of aqueous solution of HPC increases the average shear strain at the occurrence of the wavy texture. The temperature of aqueous solution of HPC affects the shear rates at the occurrence of the wavy texture.
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