Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/12592

TitleHelical flow during rotational pipe extrusion,
Author(s)Martins, Manuel Rodrigues
Covas, J. A.
KeywordsPipe extrusion
Helical flow
Mandrel rotation
Flow modelling
Issue date2006
PublisherManey Publishing
JournalPlastics, Rubber and Composites
Abstract(s)The helical flow resulting from the superposition of mandrel rotation with tubular polymer extrusion is studied. The experiments, carried out under conditions relevant to industrial practice, confirmed a pressure drop reduction upon increasing mandrel rotation and a decrease in torque when increasing the flowrate. An available analytical model was extended to consider the case when the inner wall of the channel is adiabatic and modified to predict torque and pressure drop. The results show a good agreement with experimental data. Information on velocity and viscosity profiles, melt temperature at the outlet, and first and second normal stress differences is also reported. Theoretical and experimental data confirmed unfavourable energy consumption upon mandrel rotation, but at high flowrates the energy consumption is similar to that for conventional static mandrel operation. The model is also used to estimate processing windows favouring the mechanical performance of the extrudate.
TypeArticle
URIhttp://hdl.handle.net/1822/12592
DOI10.1179/174328906X79950
ISSN1465-8011
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

Files in This Item:
File Description SizeFormat 
36. Helical flow during rotational pipe extrusion.pdf
  Restricted access
330,71 kBAdobe PDFView/Open

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID