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Experimental study and modeling of oscillating flow of high density polyethylenes

 

作者: V. Durand,   B. Vergnes,   J. F. Agassant,   E. Benoit,   R. J. Koopmans,  

 

期刊: Journal of Rheology  （AIP Available online 1996）
卷期: Volume 40, issue 3  

页码: 383-394

 

ISSN:0148-6055

 

年代: 1996

 

DOI:10.1122/1.550749

 

出版商: The Society of Rheology

 

关键词: Polyethylene;Spurt flow;Oscillating flow;Melt fracture;Relaxation oscillations;POLYETHYLENES;FLOW RATE;OSCILLATIONS;HYSTERESIS;RELAXATION;INSTABILITY

 

数据来源: AIP

 

摘要:

The influence of flow rate and die geometry on the observable flow rate/pressure relationship of a linear high density polyethylene is investigated using a capillary rheometer. The experimental results are applied to an adapted version of the relaxation–oscillation model proposed by Molenaar and Koopmans for describing the oscillating flow regime. The current model allows for a quantitative description of the hysteresis cycle in the oscillating flow regime in terms of the main experimental variables, such as imposed flow rate, reservoir (barrel) volume, and material compressibility.

 

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