Frequency-dependent complex viscosity obtained for a liquid two-dimensional dusty plasma experiment
Frequency-dependent complex viscosity obtained for a liquid two-dimensional dusty plasma experiment
复制标题
液体二维尘埃等离子体实验获得的频率相关复数粘度
DOI：
10.1103/physreve.105.015209
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
Goree, J.
中科院分区：
文献类型：
--
作者：
Berumen, Jorge;Goree, J.
液相中的强耦合等离子体可以通过复粘度来表征，复粘度是频率的函数。对一个尘埃等离子体实验的数据进行了分析，比较了两种不同方法的结果.在非平衡方法中，一对反向传播的激光束，由一个间隙，施加正弦剪切二维液体，并确定使用本构关系。在平衡法中，没有外加剪力，因此可以用广义Green-Kubo关系式计算。这两种方法的结果进行了比较的真实的和虚部。对于这两个部分，它被证实，这两种方法产生的结果，同意定性在其趋势与频率，与真实的部分减少与虚部增加，如预期的粘弹性液体。从定量上看，两种方法测得的值略有不同.对于我们分析的实验，值的真实的和虚部的基本上大于那些在早期的实验中，我们归因于剪切稀化效应在早期的实验报告。我们分析的实验是为了尽量减少剪切稀化，与早期的实验不同。
Strongly coupled plasmas in a liquid phase can be characterized by a complex viscosity, which is a function of frequency. Data from a single experiment with dusty plasma were analyzed to compareobtained by two fundamentally distinct methods. In a nonequilibrium method, a pair of counterpropagating laser beams, separated by a gap, applied a sinusoidal shear to a two-dimensional liquid, andwas determined using the constitutive relation. In an equilibrium method, there was no externally applied shear, socould be calculated with a generalized Green-Kubo relation. The results for these two methods are compared for the real and imaginary parts of. For both parts, it is confirmed that the two methods yield results that agree qualitatively in their trends with frequency, with the real part diminishing withand the imaginary part increasing with, as expected for viscoelastic liquids. Quantitatively, the values ofobtained by the two methods differ slightly. For the experiment that we analyze, values for the real and imaginary parts ofare substantially greater than those reported in an earlier experiment, which we attribute to shear thinning effects in the earlier experiment. The experiment we analyze was designed to minimize shear thinning, unlike the earlier experiment.