论文标题
粘弹性对粘弹性流体中稀释液中剪切厚的影响
Effects of viscoelasticity on shear-thickening in dilute suspensions in a viscoelastic fluid
论文作者
论文摘要
我们使用基于平滑的轮廓方法的新型直接数值仿真，研究了流体弹性对稀释悬浮液中稀释悬浮液的剪切厚度的影响。流体弹性取决于Weissenberg的数量WI和粘度比$ 1-β=η_p/（η_s+η_p）$，该$衡量聚合物应力和流量之间的耦合：$η_p$和$η_s$分别与$ 1- $ 1- $相结合。 $β\to 1$ limit, the growth rate of the normalized polymer stress with Wi was suppressed.Analysis of flow and conformation dynamics around a particle for different $β$ reveals that at large $1-β$, polymer stress modulates flow, leading to suppression of polymer stretch.This effect of $β$ on polymer stress development indicates complex coupling between fluid elasticity and flow, and is essential to understand the rheology and粘弹性介质的悬浮液中的流体动力相互作用。
We investigate previously unclarified effects of fluid elasticity on shear-thickening in dilute suspensions in an Oldroyd-B viscoelastic fluid using a novel direct numerical simulation based on the smoothed profile method. Fluid elasticity is determined by the Weissenberg number Wi and by viscosity ratio $1-β=η_p/(η_s+η_p)$ which measures the coupling between the polymer stress and flow: $η_p$ and $η_s$ are the polymer and solvent viscosity, respectively.As $1-β$ increases, while the stresslet does not change significantly compared to that in the $β\to 1$ limit, the growth rate of the normalized polymer stress with Wi was suppressed.Analysis of flow and conformation dynamics around a particle for different $β$ reveals that at large $1-β$, polymer stress modulates flow, leading to suppression of polymer stretch.This effect of $β$ on polymer stress development indicates complex coupling between fluid elasticity and flow, and is essential to understand the rheology and hydrodynamic interactions in suspensions in viscoelastic media.
