On the analysis of fluid flow and heat transfer in the melt conveying section of a single-screw extruder

Seppo Syrjälä

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

An approach is presented to efficiently compute the three-dimensional fluid flow and heat transfer in the melt conveying section of a single-screw extruder. The analysis is based on a moving barrel formulation with an unwound screw channel of rectangular cross section. The viscosity of the polymer melt is described by the power law model together with the exponential temperature dependence. The solution technique consists of marching in the down-channel direction using a fully implicit scheme and solving the resulting equations in each cross-sectional plane by the Galerkin finite element method. Unlike most previous analyses, the present approach takes full account of the recirculatory nature of the cross-channel flow, and therefore also, the cross-stream convection effects are properly accounted for. The present numerical scheme is capable of producing converged wellbehaved solutions without the traditional need for upwinding even at very high values of the Peclet number. The numerical results obtained establish that the cross-channel recirculating flow and associated convection effects play a major role in determining the flow and heat transfer characteristics in a typical rectangular screw channel having large (but finite) aspect ratio.
Original languageEnglish
Pages (from-to)25-47
Number of pages23
JournalNumerical Heat Transfer: Part A: Applications
Volume35
Issue number1
DOIs
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed

Fingerprint

Channel Flow
Conveying
screws
Extruders
fluid flow
Convection
Fluid Flow
Heat Transfer
Flow of fluids
heat transfer
channel flow
Channel flow
Heat transfer
Upwinding
Polymer Melts
Galerkin Finite Element Method
Three-dimensional Flow
Implicit Scheme
convection
Temperature Dependence

Cite this

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abstract = "An approach is presented to efficiently compute the three-dimensional fluid flow and heat transfer in the melt conveying section of a single-screw extruder. The analysis is based on a moving barrel formulation with an unwound screw channel of rectangular cross section. The viscosity of the polymer melt is described by the power law model together with the exponential temperature dependence. The solution technique consists of marching in the down-channel direction using a fully implicit scheme and solving the resulting equations in each cross-sectional plane by the Galerkin finite element method. Unlike most previous analyses, the present approach takes full account of the recirculatory nature of the cross-channel flow, and therefore also, the cross-stream convection effects are properly accounted for. The present numerical scheme is capable of producing converged wellbehaved solutions without the traditional need for upwinding even at very high values of the Peclet number. The numerical results obtained establish that the cross-channel recirculating flow and associated convection effects play a major role in determining the flow and heat transfer characteristics in a typical rectangular screw channel having large (but finite) aspect ratio.",
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On the analysis of fluid flow and heat transfer in the melt conveying section of a single-screw extruder. / Syrjälä, Seppo.

In: Numerical Heat Transfer: Part A: Applications, Vol. 35, No. 1, 1999, p. 25-47.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Syrjälä, Seppo

PY - 1999

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AB - An approach is presented to efficiently compute the three-dimensional fluid flow and heat transfer in the melt conveying section of a single-screw extruder. The analysis is based on a moving barrel formulation with an unwound screw channel of rectangular cross section. The viscosity of the polymer melt is described by the power law model together with the exponential temperature dependence. The solution technique consists of marching in the down-channel direction using a fully implicit scheme and solving the resulting equations in each cross-sectional plane by the Galerkin finite element method. Unlike most previous analyses, the present approach takes full account of the recirculatory nature of the cross-channel flow, and therefore also, the cross-stream convection effects are properly accounted for. The present numerical scheme is capable of producing converged wellbehaved solutions without the traditional need for upwinding even at very high values of the Peclet number. The numerical results obtained establish that the cross-channel recirculating flow and associated convection effects play a major role in determining the flow and heat transfer characteristics in a typical rectangular screw channel having large (but finite) aspect ratio.

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