高分子溶液の押出し流れにおける流入状態 : Dennモデルを用いた数値解析

概要

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The entrance flow patterns for viscoelastic fluid are simulated using the finite difference scheme. Denn model is used as the consititutive equation. The prediction of the size of the secondary flow vortex (L_v) for Newtonian fluid agrees with the experimental observations of Boger et al. and the prediction of Kim-E et al. For a power law fluid, shear-thinning decreases L_v and shear-thickening increases. For a viscoelastic fluid, L_v for N_<Re><0.1 (N_<Re>: Reynolds Number) is the same as for the creeping flow (N_<Re>→0). Thus, V_v for the viscoelastic fluid is dependent on the Weissenberg number (N_<We>) for N_<Re><0.1 the creeping flow and on N_<Re> and N_<We> for N_<Re>>0.1. This result agrees with our experimental observations for polymer solutions.
一般社団法人日本機械学会の論文
1989-02-25