Squeezing Flow Successively Generated in the Normal and Reverse Directions in Polymer Solutions. 1st Report. Experiment on Transmitting Forces.

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  • 高分子溶液の往復スクイーズ流れに関する研究　第１報　伝達荷重についての実験
  • コウブンシ ヨウエキ ノ オウフク スクイーズ ナガレ ニ カンスル ケンキュ

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Abstract

In a pool of solution, an upper spherical surface is first approached (or separated) and subsequently made to separate (or approach) relative to a lower flat plate at a constant speed. The transmitted forces are measured, and the following are observed. In the cases of Separan solutions, the measured force overshoots the force estimated by viscous stress at the inception of the subsequent squeezing when a pause time taken in transit between the two squeezing is sufficiently long. However, when the pause time is short, the overshoot in the subsequent squeezing decreases because of an unrelaxed part of the stress produced in the preceding squeezing and the stress generated in the slow squeezing due to the springback of the load cells utilized. If more than 20% of the opposite force evaluated by viscous stress is unrelaxed and left at the inception of the subsequent squeezing, then no overshoot is developed. In the case of PEO solution, whose properties are similar to those of the Separan solution in steady flow, the force measured can be predicted by the viscous stress alone. It is considered that there is a difference between these two solutions in the molecular size of the polymer in water.

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