粘弾性流体の異常流出の初期形状 : プラグの発生としわの周方向局所性

概要

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An initial distortion of anomalous extrudate of polyethylene when wall shear rate increases has been categorized as "sharkskin". We examine two distinct extrudate distortions in this study. One is locality of wrinkles in the circumferential direction of the extrudate, which occurs when the temperature of polyethylene is increased from that before the experiment. The other is generation of plugs overlapped with the wrinkles, which occurs when the temperature is decreased from that before the experiment. They suggest a memory effect which appears frequently in a flow of viscoelastic fluid. Two kinds of shear stress-shear rate characteristics appeared and they merged into one line when the wall shear rate was increased and the well-known sharkskin phenomenon was then generated. Frequencies of the wrinkles and the plugs were measured and some qualitative discussions were given for theoretical treatments which will be performed in the future.
一般社団法人日本機械学会の論文
1996-02-25