论文标题
悬浮在矿物油中
Rheology of Polydisperse non-Spherical Graphite Particles Suspended in Mineral Oil
论文作者
论文摘要
我们研究了填充浓度和微物理学对悬浮在牛顿矿物油中的多脱脂粉颗粒的流变学的作用。在稳定的剪切中，我们的样品表现出剪切变薄，并且对于体积分数$ ϕ> 0.18 $，观察到了屈服行为。使用Arrhenius型水平移位因子观察到时间温度的叠加，从而使流动活化能取决于石墨体积分数，这表明浓度依赖于悬浮液中的松弛过程的贡献。流动曲线由基于约束的模型拟合，表明流动行为由摩擦和粘合剂接触控制，该模型表明粘合应力取决于温度。
We study the role of filler concentration and microphysics on the rheology of polydisperse flake-graphite particles suspended in Newtonian mineral oil. Under steady shear, our samples exhibit shear thinning and yielding behaviour is observed for volume fractions $ϕ> 0.18$. Time-temperature superposition was observed using an Arrhenius-type horizontal shift factor, giving a flow activation energy that is dependent on the graphite volume fraction, suggesting concentration-dependent contributions to relaxation processes in the suspensions. The flow curves are fitted by a constraint-based model, indicating that the flow behaviour is controlled by frictional and adhesive contacts, with the model suggesting that the adhesive stress is temperature dependent.
