• 作者： Lee, Woei-Shyong
• 中文摘要： 本文從理論深入探討雙層紡絲系統之穩態分析。一簡單模式組合被選用來模擬此雙層紡絲系統,其中以牛頓流體代表內層成分,以upper- convected Maxwell模式代表外層成分。本文研究周張力(hoop stress)對雙層紡絲系統之影響,由穩態分析結果顯示,僅在高分子流體被拉伸時,位於模具出口不遠處,周張力對雙層紡絲系統僅有些許影響。穩態分析結果亦顯示,只要初剪切力(initial shear stress)的值不要太大,其值並不會明顯地影響到雙層紡絲流動系統。本文同時對不同的流體黏度比(shear viscosity ratio)進行穩態分析,結果證實具有高黏度之流體主宰著流動行為。
• 英文摘要： The steady analysis of a two-phase fiber spinning was further investigated in this study. A simple model was selected to examine a two-phase flow in which the two fluids are a Newtonian fluid as the core layer and an upper- convected Maxwell fluid as the skin layer, respectively. Additionally, the hoop stress was considered to investigate the effect on the flow behavior of the two-phase fiber spinning. Steady analysis results indicated that the hoop stress can affect the flow only at the region near the die exit. Those results revealed that the flow system is insensitive to the selection of the initial shear stress unless the initial shear stress is extremely large. Furthermore, the ratio of shear viscosities of two different materials was varied to make a comparison of the flow behaviors, revealing that the material with a high shear viscosity dominates the flow.
• 中文關鍵字： 雙層紡絲; 周張力; 初剪應力; 黏度比
• 英文關鍵字： Two-Phase Fiber Spinning; Hoop Stress; Initial Shearing Stress; Viscosity Ratio