Rheology of concentrated suspensions of non-colloidal rigid fibres
Rheology of concentrated suspensions of non-colloidal rigid fibres
复制标题
非胶体刚性纤维浓缩悬浮液的流变学
DOI：
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发表时间：
2017
影响因子：
3.7
通讯作者：
É. Guazzelli
中科院分区：
文献类型：
--
作者：
F. Tapia;Saif Shaikh;Jason E. Butler;O. Pouliquen;É. Guazzelli
压力和体积施加的流变学用于研究非胶体、刚性纤维在长径比从3到15的集中状态下的悬浮液。悬浮液表现出屈服应力。减去这些表观屈服应力，就会发现剪应力和法向应力都存在粘性标度。长径比的变化不影响摩擦系数（剪应力与正应力之比），但长径比的增大降低了悬浮液流动的最大体积分数。提出了粘滞过渡附近黏度和摩擦系数的本构规律。
Pressure- and volume-imposed rheology is used to study suspensions of non-colloidal, rigid fibres in the concentrated regime for aspect ratios ranging from 3 to 15. The suspensions exhibit yield stresses. Subtracting these apparent yield stresses reveals a viscous scaling for both the shear and normal stresses. The variation in aspect ratio does not affect the friction coefficient (ratio of shear and normal stresses), but increasing the aspect ratio lowers the maximum volume fraction at which the suspension flows. Constitutive laws are proposed for the viscosities and the friction coefficient close to the jamming transition.