Normal stress differences in non-Brownian fiber suspensions
Normal stress differences in non-Brownian fiber suspensions
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非布朗纤维悬浮液中的法向应力差异
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
E. Lemaire
中科院分区：
文献类型：
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作者：
S. Bounoua;P. Kuzhir;E. Lemaire
在本文中，我们提出了一个实验研究，在受剪切流动的非布朗刚性纤维悬浮物中出现的正应力差异。早期对牛顿流体中纤维悬浮液的法向应力的测量结果仅为N1−N2，而Snook等人最近的工作[J]。流体力学[j] . 758, 486-507(2014)]和本文分别提供了N1和N2的首次测量结果。[J]。流体力学[j] . 758, 486-507(2014)]在与纤维长度相比非常宽的间隙下进行此类测量，而本文探讨的是当间隙为纤维长度的4-10倍时约束的影响。第一个和第二个法向应力差是用一个单一的实验来测量的，这个实验包括确定第二个法向应力的径向分布，沿着速度梯度方向，Σ22，在两个平行圆盘之间的扭转流动中。悬浮液是由浸在中性浮力牛顿流体中的单分散纤维制成的。两个纤维…
In this paper, we present an experimental study of the normal stress differences that arise in non-Brownian rigid fiber suspensions subject to a shear flow. While early measurements of the normal stress in fiber suspensions in Newtonian fluids measured only N1 − N2, the recent work of Snook et al. [J. Fluid Mech. 758, 486–507 (2014)] and the present paper provide the first measurements of N1 and N2 separately. Snook et al. [J. Fluid Mech. 758, 486–507 (2014)] perform such measurements with a gap that is very wide compared with the fiber length, whereas the present paper explores the effects of confinement when the gap is 4–10 times the fiber length. The first and the second normal stress differences are measured using a single experiment which consists of determining the radial profile of the second normal stress, along the velocity gradient direction, Σ22, in a torsional flow between two parallel disks. Suspensions are made of monodisperse fibers immersed in a neutrally buoyant Newtonian fluid. Two fiber...