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arXiv 2201.12555physics.flu-dyncond-mat.soft
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流变聚结:通过液滴聚结的弛豫时间

Rheocoalescence: Relaxation time through coalescence of droplets

Sarath Chandra Varma, Abhineet Singh Rajput, Aloke Kumar

摘要:

已知悬垂液滴与固着液滴聚结以形成单个子液滴的动力学形成桥。桥的演变始于两滴之间的点接触,导致尺寸与液滴直径相当的液体颈。为了探测聚合物流体中的这种现象,我们使用高速成像来量化聚结过程中的颈部半径增长。在目前的研究中,我们揭示了存在三个制度的基础上的浓度比$c/c^*$,即,惯性弹性$c/c^*<c_e/c^*$,粘弹性$c_e/c^*<c/c^*<20$和弹性为主的制度$c/c^*>20$。研究结果表明,颈半径随时间(t)的增长服从幂律行为$t^b$,使得系数$b$在惯性弹性和粘弹性区域具有稳定值,在弹性主导区域单调减小.基于$b$对浓度比的这种依赖性,我们提出了一种新的测量技术流变聚结来获得这些流体的弛豫时间。我们还显示了偏离文献中提出的普遍性的弹性为主的制度。

英文摘要:

Dynamics of the pendant drop coalescing with a sessile drop to form a single daughter droplet is known to form a bridge. The bridge evolution begins with a point contact between the two drops leading to a liquid neck of size comparable to the diameter of the drops. To probe this phenomenon in polymeric fluids, we quantify the neck radius growth during coalescence using high speed imaging. In the current study, we unveil the existence of three regimes on basis of concentration ratio $c/c^*$ namely, inertio-elastic $c/c^*<c_e/c^*$, viscoelastic $c_e/c^*<c/c^*<20$ and elasticity dominated regimes $c/c^*>20$. Our results suggest that the neck radius growth with time (t) obeys a power-law behaviour $t^b$, such that the coefficient $b$ has a steady value in inertio-elastic and viscoelastic regimes, with a monotonic decrease in elasticity dominated regime. Based on this dependence of $b$ on concentration ratios, we propose a new measurement technique Rheocoalescence to obtain the relaxation time of the these fluids. We also show a deviation from universality proposed in literature for the elasticity dominated regime.

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