论文标题
风湿性：通过液滴合并的放松时间
Rheocoalescence: Relaxation time through coalescence of droplets
论文作者
论文摘要
众所周知，吊坠滴的动力与无柄滴一起形成单个女儿液滴。桥的演变始于两滴之间的点接触，导致液体的液体与滴头直径相当。为了探测聚合物流体中的这种现象，我们使用高速成像在合并过程中量化了颈部半径的生长。在当前的研究中，我们根据浓度比$ c/c^*$提出了三个制度的存在，即，惯性弹性$ c/c/c^*<c_e/c^*$，Viscoelastic $ c_e/c^*<c/c/c^*<c/c^*<c/c^*<20 $ and Elasticity of Sirasine opinations opinalitions $ c/c/c^*> 20 $ 20 $。我们的结果表明，随着时间的时间（T）遵守幂律行为$ t^b $，因此系数$ b $在惯性弹性和粘弹性方案中具有稳定的价值，并且弹性占主导地位的单调下降。基于$ b $对浓度比率的这种依赖性，我们提出了一种新的测量技术，以获得这些流体的放松时间。我们还表明了与文献中提出的有关弹性占主导地位的普遍性的偏差。
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.
