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Structure and size optimization of groove flow system for carbon fiber

YANG Yang1,CHEN Hui2,LYU Hongzhan2,CHEN Xiliang2(1.Faculty of Science,Ningbo University,Ningbo 315211,Zhejiang,China; 2.Ningbo Institute of Materials Technology & Engineering,Chinese Academy of Sciences,Ningbo 315201,Zhejiang,China)  
During the production process of carbon precursor fiber,the stability of flow field in groove flow system should be ensured to reduce the influence of double diffusion process when the spinning dope solidifies into as-spun fiber after flowing into the groove.The influence of spinneret covers with different shapes and dimensions on turbulent flow in the fiber groove flow system is simulated using the unsteady Reynolds equations and standard k-ε turbulence model.The detour flow is calculated by 2D rectangular bluff body models with different length-height ratios under high Reynolds number.The optimum structural parameters are obtained after comparing the magnitude of turbulences in the wake flow.The results show that,the length-height ratio of the cover is the main influencing factor on turbulence magnitude;when the ratio is close to 4,the turbulent flow near spinneret is relatively small,but after that the turbulence reduction is not obvious as the ratio increases.
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