微约束剪切流中夹砂液滴的形状演化
Shape Evolution of Sandwitched Droplet in Microconfined Shear Flow
摘要：
限制在微流体通道中的液滴通常表现出有趣的形状，主要归因于小尺度上复杂的流体动力学相互作用。我们发现，不同的基板润湿性条件的影响可能会进一步复杂化这些相互作用显着，往往是非平凡的。我们的研究表明，基板的润湿性和流体限制的综合影响最终达到高潮，对影响液滴瞬变，局部剪切流场的扭曲，以及对破碎或分离的液滴稳定，允许一个开发不同的制度的形状演变是迷人的不同，从早期的研究中报道的微约束剪切流中的液滴破碎。我们进一步证明，壁效应和界面润湿性特性的综合后果可以利用图案化微流体基板与预先设计的补丁，在当代相关的几个科学和技术应用中具有广泛的科学和技术后果。
英文摘要：
Droplets confined in a microfluidic channel often exhibit intriguing shapes, primarily attributable to complex hydrodynamic interactions over small scales. We show that effect of varied substrate wettability conditions may further complicate these interactions remarkably, and often non-trivially. Our studies reveal that the combined influence of substrate wettability and fluidic confinement eventually culminates towards influencing the droplet transients, distortion of the local shear flow field, as well as drop stabilization against breakup or detachment, allowing one to develop different regimes of shapes evolution that are fascinatingly distinct from the ones reported in earlier studies on drop breakup in micro-confined shear flows. We further demonstrate that combined consequences of wall effects and interfacial wettability characteristics can be exploited to pattern microfluidic substrates with pre-designed patches, bearing far-ranging scientific and technological consequences in several scientific and technological applications of contemporary relevance.
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