论文信息 - The Vortex Growth of a K.b.k.z. Fluid in An Abrupt Contraction

The Vortex Growth of a K.b.k.z. Fluid in An Abrupt Contraction

Abstract A constitutive equation of the K.B.K.Z. type is used to describe the flow behavior of LDPE melts in abrupt contractions. The numerical algorithm is the finite element method based on a fixed mesh while the strain history is calculated along streamlines. It is shown that the calculations based on the K.B.K.Z. model do predict the occurrence of vortices at relatively low values of the Weissenberg number, which in general is not the case with other less realistic models.

Marcel Crochet | S. Dupont | M. Crochet | S. Dupont

[1] M. Crochet,et al. Further Results On the Flow of a Viscoelastic Fluid Through An Abrupt Contraction , 1986 .

[2] M. Crochet,et al. Finite-element Simulation of Viscoelastic Fluids of the Integral Type , 1985 .

[3] C. Macosko,et al. An Integral Constitutive Equation for Mixed Flows: Viscoelastic Characterization , 1983 .

[4] H. Laun. Description of the non-linear shear behaviour of a low density polyethylene melt by means of an experimentally determined strain dependent memory function , 1978 .

[5] R. Tanner,et al. A streamline element scheme for solving viscoelastic flowproblems part II: Integral constitutive models , 1986 .

[6] H. Laun,et al. Elongational behaviour of a low density polyethylene melt , 1978 .

[7] James L White,et al. Flow patterns in polyethylene and polystyrene melts during extrusion through a die entry region: measurement and interpretation , 1977 .

[8] Marcel Crochet,et al. Hermitian Finite-elements for Calculating Viscoelastic Flow , 1986 .