Abstract
A classical method for visualization of transparent fibers in fiber suspensions using a planar light source is examined by geometrical optics and its defect is revealed. To overcome the defect, a new method using fibers with birefringence is proposed. In the present method the crossed polarizers rotating at a high speed are introduced to observe the fibers with birefringence nearly oriented in the polarizing directions. As a result, the applicability of this method to the visualization of the fibers in a concentrated fiber suspension flow through a slit channel has been confirmed, and its usefulness for the measurement of the fiber orientation and fiber concentration distribution has been demonstrated. Furthermore, our experimental relationship of total shear strain vs. orientation angle in a dilute fiber suspension flow is compared with a theoretical result, and it shows the similar tendency to the theoretical one.
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