论文标题
高雷诺数中的灾难性阶段反转数字湍流 - 库特流动
Catastrophic phase inversion in high-Reynolds number turbulent Taylor--Couette flow
论文作者
论文摘要
乳液在食品工业，医疗保健和化学合成中无处不在。在这封信中，高度动荡的元稳定油水乳液的动力学（$ 10^{11} \ leq \ text {ta} \ leq 3 \ times 10^{13} $）taylor-couette-couette-couette流，远离equilibrium的taylor-couette。通过改变水中的水分馏分，可以触发水中和油中乳液之间的灾难性相位反转，从而改变形态，包括液滴尺寸和混合物的流变特性。通过结合全局扭矩测量和局部原位激光诱导的荧光（LIF）显微镜成像来体现这些不同状态的表现。尽管流动的湍流及其油水混合物的动态平衡，但发现该系统的全局扭矩响应似乎是流体是牛顿的，并且发现混合物的有效粘度比其任何一个组成部分都大几倍或更小。
Emulsions are omnipresent in the food industry, health care, and chemical synthesis. In this Letter the dynamics of meta-stable oil-water emulsions in highly turbulent ($10^{11}\leq\text{Ta}\leq 3\times 10^{13}$) Taylor--Couette flow, far from equilibrium, is investigated. By varying the oil-in-water void fraction, catastrophic phase inversion between oil-in-water and water-in-oil emulsions can be triggered, changing the morphology, including droplet sizes, and rheological properties of the mixture, dramatically. The manifestation of these different states is exemplified by combining global torque measurements and local in-situ laser induced fluorescence (LIF) microscopy imaging. Despite the turbulent state of the flow and the dynamic equilibrium of the oil-water mixture, the global torque response of the system is found to be as if the fluid were Newtonian, and the effective viscosity of the mixture was found to be several times bigger or smaller than either of its constituents.
