ผลการลื่นไถลของวัสดุพอลิเมอร์สำหรับการไหลเคลือบเส้นลวด / ปิยมาภรณ์ อุตมัง = Slip effects of a polymeric material for wire-coating flows / Piyamabhorn Uttamung
The simulation of viscoelastic fluid for wire-coating flow has been considered for die-swell with drag, pressure- and tube-tooling cases via application of Navier-Stokes and Phan-Thien/Tanner constitutive equations for the creeping flow model. The computation of free surfaces after die with and without slip velocity at die wall is analyzed in a axisymmetric coordinate system. Numerical solutions are computed by a time marching semi-implicit Taylor-Galerkin pressure-correction finite element method (Semi-implicit TGPC). The solutions for axisymmetry incompressible creeping flow in the absence of body forces are presented. The wire-coating simulations are compared with the results of no slip input. This research uses the velocity gradient recovery and the streamline-upwind/Petrov-Galerkin (SUPG) techniques to stabilize the converge solutions. The mesh beyond die is re-localized after velocity field and free surface calculations in order to predict free surface path. The slip velocity at die-wall reduces the swelling ratio, shear stress, shear rate, extensional rate and pressure drop when compare with the same problems with no-slip condition.
