Evaluation of end effects in capillary rheometers for solutions of flexible polymers
作者:
Lourdes de Vargas,
José Pérez‐González,
Javier de J. Romero‐Barenque,
期刊:
Journal of Rheology
(AIP Available online 1995)
卷期:
Volume 39,
issue 1
页码: 125-137
ISSN:0148-6055
年代: 1995
DOI:10.1122/1.550694
出版商: The Society of Rheology
关键词: POLYMERS;SOLUTIONS;END EFFECTS;MEASURING INSTRUMENTS;CAPILLARY FLOW;POLYETHYLENES;ACRYLAMIDE;CONFORMATIONAL CHANGES;SLIP FLOW;MACROMOLECULES;SHEAR FLOW;SLIP FLOW
数据来源: AIP
摘要:
Flow experiments with a capillary rheometer using 0.3% polyacrylamide and 0.75% polyox aqueous solutions were performed to study flow development and end effects generated by polymer solutions of flexible macromolecules. SeveralL/Dcapillary ratios were employed, and a method proposed recently was used to evaluate the corrections due to end effects. The corrections obtained are of the same order of magnitude than those obtained using the Bagley method, but the Bagley corrections have much larger uncertainties. The recently proposed method is superior to the Bagley method when accurate end effects are required, as for correlations with elasticity or to evaluate numerical predictions for the flow behavior of these fluids.
点击下载:
PDF
(683KB)
返 回