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Differential Viscoelastic Constitutive Equations in Steady Shear and Extensional Flows
of the proposed modified Leonov model are compared with the eXtended Pom-Pom model and modified White-Metzner model in steady shear and uniaxial extensional flows of LDPEA modification of the dis...
CD - Makromolekulární chemie
- 2003 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Influence of Die Design on Interfacial Instabilities in Coextrusion
Modeling of the coextrusion flow has been performed by viscoelastic FEM where modified Leonov model has been used as constitutive equation. It has been revealed the minor channel design has the major influence on t...
CD - Makromolekulární chemie
- 2005 •
- D
Rok uplatnění
D - Stať ve sborníku
An appraisal of differential constitutive equations for polymer melts under various flow situations
Newly proposed Leonov model was compared with modified White-Metzner model and eXtended Pom-Pom model in steady shear and steady uniaxial flow situations for three different polymer melts: LDPE, mLLDPE, an...
CD - Makromolekulární chemie
- 2003 •
- D
Rok uplatnění
D - Stať ve sborníku
The Effect of Layer Stretching on the Onset of 'Wave' Interfacial Instabilities in Coextrusion Flows.
The effect of layer stretching on the onset of 'wave' interfacial instabilities in coextrusion flows is evaluated through transient viscoelastic stress calculation by modified Leonov model and the velocity field determinati...
CD - Makromolekulární chemie
- 2001 •
- D
Rok uplatnění
D - Stať ve sborníku
Investigation of advanced constitutive equations under different flow conditions
The predictive capabilities of three models (eXtended Pom-Pom, PTT- XPP and modified Leonov model) are tested for both steady as well as transient shear and uniaxial extensional flows of LDPE. In the second part of...
BK - Mechanika tekutin
- 2006 •
- D
Rok uplatnění
D - Stať ve sborníku
Investigation of Advanced Constitutive Equations under Different Flow Conditions
The predictive capabilities of three models (eXtended Pom-Pom, PTT- XPP and modified Leonov model) are tested for both, steady as well as transient shear and uniaxial extensional flows of LDPE. In the second part o...
CD - Makromolekulární chemie
- 2006 •
- D
Rok uplatnění
D - Stať ve sborníku
Investigation of Abrupt Contraction Flows of LDPE Melts with Advanced Differential Constitutive Equations
Theoretical and experimental analysis was performed for investigation of stress field generating during the abrupt contraction flow of LDPEs melts. For this purpose, flow visualization cell experiments and viscoelastic FEM analysis employing modi...
CD - Makromolekulární chemie
- 2006 •
- D
Rok uplatnění
D - Stať ve sborníku
Numerical Simulation of Polymer Coextrusion Flows: A Criterion for Detection of "Wave" Interfacial Instability Onset
Non-isothermal calculation of flow history dependent viscoelastic stresses in a coextrusion die is performed using the 8-mode modified Leonov constitutive equation. It is shown that a heuristic criterion based on the difference of n...
CD - Makromolekulární chemie
- 2001 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Investigation of zig-zag type of interfacial instabilities in coextrusion
Modified Leonov model has been used for the viscoelastic stress calculation in the flat multi-manifold coextrusion die used for LDPE film casting process. It has been shown that specific type of high stress area occurs arou...
CD - Makromolekulární chemie
- 2005 •
- D
Rok uplatnění
D - Stať ve sborníku
Applicability of advanced constitutive equations for coextrusion flows of polyolefin melts
The fitting/predictive capabilities of three models (eXtended Pom-Pom, PTT-XPP and modified Leonov model) are tested for both, steady as well as transient shear equations has been investigated from the coextrusion ...
BK - Mechanika tekutin
- 2007 •
- D
Rok uplatnění
D - Stať ve sborníku
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