重力による落下する粘弾性流体噴流上の変形の伝ぱ挙動:周期的変形による定性波の発生

概要

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In the previous work, we investigated the transmission behavior of deformation, caused by a lateral impulsive hit, on a viscoelastic fluid jet falling vertically in air driven by the gravity. In this work, the jet is subjected to a lateral periodic deformation at a point. A standing wave is formed on the jet at a suitable frequency and position of the deformation. The wave length of the standing wave is strongly affected by the frequency of the deformation, the deformation position and concentration of the polymer solutions. Since the flow rate does not affect the shape of the standing wave, it is found that the transmission velocity of the periodic deformation is independent of the falling velocity of the jet and the deformation transmits with a constant velocity along the jet. The normal stress acting on the jet can be calculated from the transmission velocity of the standing wave with fluid density. The elongation viscosity is estimated by the normal stress and elongation rate evaluted by the jet shape.
一般社団法人日本機械学会の論文
2000-01-25