重力により落下する粘弾性流体噴流上の変形の伝ぱ挙動 : 衝撃的変形の伝ぱ挙動

概要

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Mechanism of transmission behavior of a pulse deformation on a viscoelastic fluid jet is investigated. The jet of the viscoelastic fluid falls down in air vertically due to gravity. The pulse deformation is formed on the jet by impact of collision with a swinging rod. The deformation transmits to upward on the jet and rebounds off the nozzle exit like wave motion on a string. The motion of the deformation is recorded by a video camera to evaluate its transmission velocity. The transmission velocity decreases with increasing flow rate and it demonstrates the wave transmitts with a velocity relative to the falling jet liquid. The relative transmission velocity, which is based on a coordinate system moving with the falling jet, depends on the concentration of the polymer solutions but not affected by the flow rate and the history of deformation in reservoir and nozzle. The transition point of deformation reported in our previous paper corresponds with the position where the upward relative transmission velocity coinsides with the velocity of the falling jet.
一般社団法人日本機械学会の論文
1998-10-25