목분 충진 고분자 용융체의 압출다이 내 유동 및 열전달에 관한 수치해석

Abstract

A three-dimensional numerical analysis of the flow and heat transfer characteristic of wood-flour-filled polypropylene melt in an extrusion die was carried out. Used for this analysis were Finite Concept Method based on FVM, unstructured grid and non-Newtonian fluid viscosity model. Temperature and flow fields are closely coupled through temperature dependent viscosity and viscous dissipation. With large Peclet, Nahme, Brinkman numbers, viscous heating caused high temperature belt near die housing. Changing taper plate thickness and examining some predefined parameters at die exit investigated the effect of taper plate on velocity and temperature uniformities. In the presence of taper plate, uniformity at die exit could be improved and there existed an optimum thickness to maximize it. 기호설명: 온도 이전인자(temperature shift factor): 단위몰당 활성화 에너지: 주유동방향(y) 특성길이: 다이 두께방향(z) 특성길이: 다이 폭방향(x) 특성길이: 점도지표(consistency index): 지수법칙지표(power law index): 기준온도* 회원, 서울대학교 대학원 기계항공공학부