Abstract
We measured pressure drops and jet thrusts of dilute (100 ppm and 10 ppm) or ultra-dilute (1 ppm) aqueous solutions of polymer in flows through slits with width of 1.0 mm, 480 μm, and 122 μm owing to investigation of flow properties of dilute polymer solution passing through a small slit. Good agreement between the experimental results of water alone and the predictions was obtained within the experimental errors. However, the dilute and ultra-dilute polymer solutions exhibited lower values. To understanding the experimental results, we estimated mean elastic stresses via jet thrust method. Moreover, we clarified that power-law relationship between mean elastic stress and mean velocity, and it corresponded to the flow properties via the pressure drops.
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