Transient solutions of the dynamics of film casting process using a 2-D viscoelastic model

The nonlinear transient dynamics and stability of a two-dimensional (2-D) model of the isothermal film casting process have been investigated using newly devised simulation techniques employing finite element methods (FEM), which can incorporate the viscoelastic nature of polymer melts as well as th...

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Bibliographic Details
Published in:Journal of non-Newtonian fluid mechanics 2005-12, Vol.132 (1), p.53-60
Main Authors: Kim, Ju Min, Lee, Joo Sung, Shin, Dong Myeong, Jung, Hyun Wook, Hyun, Jae Chun
Format: Article
Language:English
Subjects:
ALE
Draw resonance
Edge beads
Exact sciences and technology
FEM
Film casting
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Hydrodynamic stability
Neck-in
Non-newtonian fluid flows
Nonlinearity (including bifurcation theory)
Physics
Spine method
Stability
Transient behavior
Viscoelastic fluids
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Summary:The nonlinear transient dynamics and stability of a two-dimensional (2-D) model of the isothermal film casting process have been investigated using newly devised simulation techniques employing finite element methods (FEM), which can incorporate the viscoelastic nature of polymer melts as well as the Newtonian features of other fluids. To effectively solve the time-dependent free surface problem of this system, the Arbitrary Lagrangian Eulerian (ALE) algorithm together with a spine method well-suited for free surface tracking was incorporated. Adopting robust numerical stabilization techniques for the hyperbolic system of extensional deformation processes in this study, the transient dynamic behavior of viscoelastic fluids in the 2-D film casting process are presented for the first time in the literature. It is also demonstrated that simulation models in the present study can successfully describe the basic flow behavior of the system including the three instability modes therein, i.e., draw resonance, neck-in, and development of edge beads.
ISSN:0377-0257
1873-2631
DOI:10.1016/j.jnnfm.2005.10.002