絞り部を有する矩形管流路内における粘弾性流体のスタートアップ流れの流速測定

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タイトル別名
  • Velocity Measurement in the Startup Flow of Viscoelastic Fluids through Contraction with Rectangular Cross-Section
  • シボリブ オ ユウスル クケイカン リュウロナイ ニ オケル ネンダンセイ リ

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The unsteady viscoelastic flow generated by the sudden application of a constant flow rate is experimentally examined for an abrupt contraction and a tapered one with a rectangular cross-section. The velocity change with time is measured with a L. D. V. for a 1.0 wt% aqueous solution of polyacrylamide. The gentle overshoot in the centerline velocity, which may be due to the effect of extensional flow, is observed from the vicinity of the entrance of a small slit to the downstream far from the entrance. Furthermore it is found that the flow in the entrance region finally reaches the anomalous threedimensional flow with a dual peak form of the velocity profile.

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