論文

2002年

流動複屈折測定による低粘度粘弾性流体の過渡的平面伸張流れにおける伸張応力評価方法の開発

日本機械学会論文集 B編
  • 加藤 学
  • ,
  • 高橋 勉
  • ,
  • 白樫 正高

68
676
開始ページ
3369
終了ページ
3377
記述言語
日本語
掲載種別
研究論文(学術雑誌)
DOI
10.1299/kikaib.68.3369
出版者・発行元
The Japan Society of Mechanical Engineers

A new technique to measure elongational stress of low viscous viscoelastic fluids in transient planar elongational flow is developed. The measurement instrument for this technique consists of two parts, the squeeze flow cell and the birefringence measurement device. The squeeze flow cell consists a set of parallel plates and generates step planar elongational flow on the stagnation line on the center plain of the plates. The birefringence and the orientation angle along the stagnation line in the start-up flow and the relaxation after cessation of the flow are measured. The elongational stress can be calculated from these optical data when the stress-optical rule is applicable. The comparison between the velocity distribution and the birefringence measurement using the flow cell that has several dimensions shows that the elongation rate distribution is not constant along the stagnation line by the sidewall effect. However, it is confirmed that reasonable results can be measured under the flowing condition, W=40 mm, L=20∼40 mm, H<SUB>0</SUB>=36 mm, where W and L denote the width and the length of the parallel plates and H<SUB>0</SUB> is the initial gap of parallel plates. The surfactant aqueous solution CTAB/NaSal, which is Maxwell fluid at low shear rate, is used as the sample of trial test of this technique. The planar elongational viscosity η<SUB>e</SUB>p of this sample is measured by our technique and it is compared with shear viscosity η. Trouton ratio Tr (=η<SUB>e</SUB>p/η) becomes almost 4 and this result demonstrates ability and practicality of our technique.

リンク情報
DOI
https://doi.org/10.1299/kikaib.68.3369
CiNii Articles
http://ci.nii.ac.jp/naid/130004080650

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