Measurements of velocity profile development in the spinning flows of liquid crystalline polymer solutions
作者:
N. Mori,
Y. Hamaguchi,
K. Nakamura,
期刊:
Journal of Rheology
(AIP Available online 1997)
卷期:
Volume 41,
issue 2
页码: 237-247
ISSN:0148-6055
年代: 1997
DOI:10.1122/1.550861
出版商: The Society of Rheology
关键词: Liquid crystalline polymer;Spinning;Fiber spinning;Flow visualization
数据来源: AIP
摘要:
The development of velocity profile inside a filament was studied for spinning flows of LCPs using a hydrogen-bubble method. Both isotropic (33 wt%) and liquid crystalline (50 wt%) aqueous solutions of hydroxypropylcellulose were used as the test fluids. The velocity profile for the 33 wt% solution varies from a convex profile to a uniform one similar to that for Newtonian fluids. For the 50 wt% solution, however, an anomalous profile of the velocity, that is a concave profile, is found beyond a distance of one radius of the nozzle downstream from the exit. Since this concave profile persists far downstream from the nozzle exit, it may affect the molecular orientation distribution inside a fiber.
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