Time-Weissenberg Number Superposition in 4:1 Planar Contraction Flow of a Viscoelastic Fluid
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概要
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Vortex enhancement mechanism in 4:1 planar contraction flow of a viscoelastic fluid has been investigated, where the Oldroyd-B model was considered as a constitutive equation. Finite element method was used based on the fractional step method for time marching and DEVSS/DG as a stabilizing scheme. The prediction of vortex dynamics agreed well with the experimental results. At first, a lip vortex was generated at the reentrant corner at low Weissenberg number (We). As We increases, the size of the salient corner vortex becomes reduced, while the lip vortex becomes more pronounced and finally takes over the corner vortex. The trajectory of a lip vortex at high We was found to follow the steady state positions of the lip vortex at lower We, which means that the fluid has a memory and there exists a simple relationship between We and time. Accordingly, a simple universal behavior was found to dominate the vortex enhancement mechanism in the 4:1 planar contraction flow of the Oldroyd-B fluid.
- 一般社団法人 日本レオロジー学会の論文
著者
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KIM Ju
Department of Internal Medicine, Chonnam National University Hospital
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Lee Seung
School Of Advanced Materials Engineering Chonbuk National University
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Ahn Kyung
School Of Chemical Engineering Seoul National University
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Chung Changkwon
School of Chemical and biological Engineering, Seoul National University
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Kim Ju
Department Of Housing & Interior Design Yonsei University
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Ahn Kyung
School Of Chemical And Biological Engineering Seoul National University
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Kim Ju
Department Of Chemical And Biological Engineering Korea University
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Chung Changkwon
School Of Chemical And Biological Engineering Seoul National University
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