颗粒加速粘性液体的分离
Particles accelerate the detachment of viscous liquids
摘要：
在从喷嘴挤出的粘性流体的分离期间，形成将液滴连接到喷嘴的细丝。在表面张力的作用下，细丝变薄，直到夹断和液滴的最终分离。在本文中，我们研究了单个粒子的存在下，被困在细丝上的脱离动力学的小体积分数（ε < 6%）的颗粒悬浮液的效果。我们表明，即使是一个单一的粒子强烈修改的脱离动力学。颗粒扰动细线的变细，并且在颗粒周围形成大的流体液滴。与纯流体观察到的分离相比，这种扰动导致液滴的分离加速。我们量化了不同尺寸的单个颗粒的加速度，并将其与小体积分数悬浮液的类似观察结果联系起来。我们的研究还对颗粒对更致密悬浮液分离的影响提供了更多见解，并解释了之前观察到的接近最终夹断的加速分离（Bonnoit等人，2012）
英文摘要：
During detachment of a viscous fluid extruded from a nozzle a filament linking the droplet to the latter is formed. Under the effect of surface tension the filament thins until pinch off and final detachment of the droplet. In this paper we study the effect of the presence of individual particles trapped in the filament on the detachment dynamics using granular suspensions of small volume fractions (ϕ < 6%). We show that even a single particle strongly modifies the detachment dynamics. The particle perturbs the thinning of the thread and a large droplet of fluid around the particle is formed. This perturbation leads to an acceleration of the detachment of the droplet compared to the detachment ob- served for a pure fluid. We quantify this acceleration for single particles of different sizes and link it to similar ob- servations for suspensions of small volume fractions. Our study also gives more insight into particulate effects on de- tachment of more dense suspensions and allows to explain the accelerated detachment close to final pinch off observed previously (Bonnoit et al 2012)
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