کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
160639 457090 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical simulation of fibre suspension flow through an axisymmetric contraction and expansion passages by Brownian configuration field method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Numerical simulation of fibre suspension flow through an axisymmetric contraction and expansion passages by Brownian configuration field method
چکیده انگلیسی

In this paper, the finite element method is combined with the Brownian configuration field (BFC) method to simulate the fibre suspension flow in axisymmetric contraction and expansion passages. In order to solve for the high stress at high concentration, the discrete adaptive viscoelastic stress splitting (DAVSS) method is employed. For the axisymmetric contraction and expansion passages with different geometry ratios, the results obtained are compared to available constitutive models and experiments. The predicted vortex length for dilute suspensions agrees well with experimental data in literature. Our numerical results show clearly the effect on vortex enhancement with increase of the volume fractions and the aspect ratios. Effect of aspect ratio of fibres on the vortex length is also studied. It is found that for the lower expansion ratio flows the vortex dimension in the corner region is fairly independent of fibre concentration and aspect ratio of fibres while the said vortex dimension increases with the increase of fibre concentration for contraction flows. The finding suggests that the aligned fibre approximation traditionally employed in previous work does not exactly describe the effect of fibre motion, and the present BFC method is deemed more suitable for the flow of dilute fibre suspensions. In terms of numerics, the employment of DAVSS enhances numerical stability in the presence of high concentration of fibre in the flow.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 61, Issue 15, August 2006, Pages 4998–5009
نویسندگان
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