论文标题
粘度对由空气微流体产生的液体结构的影响
Effects of viscosity on liquid structures produced by in-air microfluidics
论文作者
论文摘要
本文实验研究了粘度对常规液滴和连续液体射流之间碰撞结果的影响。考虑到液滴和射流液体的液体粘度的广泛变化，使其他材料特性保持不变。为此，仅使用了两种液体类型：用于滴剂的甘油溶液和喷气液体的不同类型的硅油。结合这些液体，粘度比λ=μDrop/μJet在0.25和3.50之间变化。碰撞结果以导致四个主要机制的状态图的形式进行分类：喷气式下降，喷气式碎片，固定的滴滴和混合的碎片。我们证明，取决于下降和喷气粘度，并非所有四个方案都可以在我们的域中观察到所有四个方案。实验表明，射流粘度主要影响射流和封装液滴中的滴剂之间的过渡，这将转向更高的滴剂间距，以获得更粘的喷气机。下降粘度使先前的过渡不变，但会修饰连续射流内滴碎片的阈值。我们开发了一个模型，该模型可以量化滴粘度如何影响其延伸，这是在后坐力期间固定其形状的一阶，因此是确定其稳定性针对捏合的。
This paper experimentally investigates the effect of viscosity on the outcomes of collisions between a regular stream of droplets and a continuous liquid jet. A broad variation of liquid viscosity of both the drop and the jet liquid is considered, keeping other material properties unchanged. To do so, only two liquid types were used: aqueous glycerol solutions for the drop and different types of silicone oil for the jet liquid. Combining these liquids, the viscosity ratio λ = μdrop/μjet was varied between 0.25 and 3.50. The collision outcomes were classified in the form of regime maps leading to four main regimes: drops in jet, fragmented drops in jet, encapsulated drops, and mixed fragmentation.We demonstrate that, depending on the drop and jet viscosity, not all four regimes can be observed in the domain probed by our experiments. The experiments reveal that the jet viscosity mainly affects the transition between drops in jet and encapsulated drops, which is shifted towards higher drop spacing for more viscous jets. The drop viscosity leaves the previous transition unchanged but modifies the threshold of the drop fragmentation within the continuous jet. We develop a model that quantifies how the drop viscosity affects its extension, which is at first order fixing its shape during recoil and is, therefore, determining its stability against pinch-off.
