论文标题
扩展$μ（J）$ - 振荡剪切流的悬浮液的流变学
Extended $μ(J)$-rheology for dense suspensions at oscillatory shear flows
论文作者
论文摘要
最近的研究强调，振荡和时间依赖性的剪切流可能有助于增加稠密悬浮液的流动性。虽然大多数焦点都集中在跨流量上，但我们在这里研究了一个简单的二维悬架，在该悬架上我们同时沿着相同的方向应用了振荡和固定剪切。我们首先表明，与先前的主张相反，该设置中的粘度随着振荡的幅度而显着降低。降低可以归因于接触次数的大量减少，并且随着振荡的幅度的增加，微观结构的变化。作为一个子重分，我们发现既扩展到$μ（J）$ - 流变学，这是剪切应力与剪切速率之间的本构关系，对纯振荡流有效，并且与稳定片条相比，对由摩擦颗粒组成的悬浮液具有更高的剪切束填充分数。
Recent studies have highlighted that oscillatory and time-dependent shear flows might help increase flowability of dense suspensions. While most focus has been on cross-flows we here study a simple two-dimensional suspensions where we apply simultaneously oscillatory and stationary shear along the same direction. We first show that the viscosities in this set-up significantly decrease with an increasing magnitude of the oscillations, contrary to previous claims. The decrease can be attributed to the large decrease in the number of contacts and an altered microstructure as the magnitude of the oscillation is increased. As a sub-result we find both an extension to the $μ(J)$-rheology, a constitutive relationship between the shear stresses and the shear rate, valid for pure oscillatory flows and with a higher shear-jammed packing fraction for suspensions composed of frictional particles compared to steady-shear conditions.
