ABS塑膠之黏滯性受剪切率及溫度所影響，並非定值。根據目前已有之文獻，可知ABS塑膠在不同剪切率與溫度下之黏滯性實驗值。本研究以代數方程式與其實驗值進行曲線擬合，得出一ABS黏滯性數學模式，並利用此數學模式探討ABS平行流於等溫以及非等溫下之流變行為。對於牛頓流體而言，完全發展區之速度曲線最高值為1.5。而對於ABS而言，其在等溫情況下，由於黏滯性於壁面較低，故其完全發展區之速度曲線最高值低於1.5；在非等溫情況下，由於黏滯性於壁面較高，故其於完全發展區之速度曲線最高值則高於1.5。此外，本研究採用NAPPLE法，以避免交錯性網格造成速度與壓力坐落於不同網格上，而使之定義複雜。

The viscosity of ABS plastic is not a constant value which will be affected by shear rate and temperature. According to the present research, the viscosity of ABS plastic from experiment is already obtained. In this study, the algebraic equation is used to fit the experimental value. Based on this curve fitting, the ABS viscosity model is provided. With the viscosity model, the parallel flow of ABS plastic is investigated in isothermal and non-isothermal condition. For the parallel flow of Newtonian fluid, it is well known that the maximum value of the fully developed velocity profile is 1.5. However, for ABS plastic, the maximum value is lower than 1.5 in isothermal condition because the viscosity around plates is higher than center, on the other hand, the maximum value is higher than 1.5 in non-isothermal condition because the viscosity around plates is lower than center. In addition, the NAPPLE method is applied in this
study to avoid the disadvantage of staggered grids.

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