非平衡熱力学に粘弾性を考慮した非等温三次元流動解析によるダイ内温度分布の予測
Numerical Simulation of Non-isothermal Three-dimensional Flow with Non-equilibrium Thermodynamics Considering Viscoelastic Effects-Temperature Distribution in Dies-
木原伸一・橋本康孝・合田高之・松永圭司・船津和守
Kihara, Shinichi / Hashimoto, Yasutaka / Gohda, Takayuki / Matsunaga, Keishi / Funatsu, Kazumori
Although most of the researches on the flow of viscoelastic fluids are isothermal cases, many flows of practical interest in polymer processing are non-isothermal. The combination of high viscosity of polymeric melts and high deformation rates results in the transformation of large amounts of mechanical energy into heat, and therefore a rise in temperature of the polymeric material. Therefore non-isothermal three-dimensional viscoelastic simulation is desired.
As far as non-isothermal viscoelastic simulation is concerned, the internal energy of fluids is usually assumed to be only a function of the temperature, but this is not a proper assumption for viscoelastic fluids. Further the problems of computational memory capacity, CPU time, and numerical convergence of viscoelastic flow simulations, non-isothermal three-dimensional viscoelastic simulation applicable to industrial flow behaviors has not yet been attempted.
In this study, we developed a numerical simulation for non-isothermal three-dimensional viscoelastic flows within dies considering the thermodynamic contribution that entropy elastic energy stores in the internal energy. Numerical results indicate that a consideration of thermodynamic contribution of viscoelastic materials is important to predict the detail temperature field.
Key words: Non-isothermal / Three-dimensional / Viscoelastic / Entropy elasticity / Numerical simulation