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옷걸이 모양 다이 내의 비뉴튼 유체 흐름에 대한 2차원 모델과 3차원 모델의 비교
Comparison of 2-Dimensional Model with 3-Dimensional Model of Non-Newtonian Fluid Flow in a Coat-Hanger Die
HWAHAK KONGHAK, June 1995, 33(3), 310-317(8), NONE
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Abstract
옷걸이 모양 다이 내의 멱수 법칙 유체의 흐름 해석을 위한 2차원 및 3차원 모델을 세우고 이들에 대하여 유한 요소법을 사용한 컴퓨터 코드를 작성하여 2차원 모델과 3차원 모델을 비교하였다. 1차원적 흐름 모델에 따라 유도된 설계식을 이용하여 옷걸이 모양 다이를 구성하였고, 이 다이에 대하여 2차원 및 3차원 모사를 수행하였다. 두 모델로부터 얻은 유량 분포, 압력 분포, 흐름선(streamlines), 경로선(pathlines), 압력 손실량 등을 비교하여 3차원 모사 결과를 기준으로 했을 때 2차원 모사의 문제점을 지적하였다. 2차원 모사는 매니폴드와 다이의 가장자리에서 흐름을 적절히 해석하지 못하였으며 유량 분포와 압력 손실량에 있어서 3차원 모사와 큰 차이를 나타내었다.
Flow of non-Newtonian fluid following power-law model in coat-hanger die has been studied through 2-dimensional and 3-dimensional model. Finite element codes for numerical simulation were developed for each model. The mathematical model of coat-hanger die was constructed according to the analytic design equation based on one-dimensional flow rate distributions, pressure distributions, streamlines, and pathlines were calculated for comparison between two models. The validity of the two-dimensional analysis was investigated based on the three-dimensional analysis. The two- dimensional model was found to be inadequate in regions of the manifold and the die side wall. There was a significant difference in the flow rate distribution and the total pressure drop between two models.
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