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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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