石墨烯流中的前湍流区
Pre-Turbulent Regimes in Graphene Flows
摘要：
我们提供的数值证据表明，在目前的实验条件下，通过可检测的电流波动，可以观察到石墨烯中的电子预湍流现象，反映了过去的局部微米级杂质的旋涡分离。涡的产生，由于微米级的收缩，也探讨了特别关注的相对论修正正常的纳维-斯托克斯方程的影响。这些修正被发现会导致流体的稳定性爆发延迟以及旋涡脱落频率的小偏移。最后，斯特劳哈尔数，无量纲措施的旋涡脱落频率，和雷诺数之间的关系提供感兴趣的条件下，为今后的实验。
英文摘要：
We provide numerical evidence that electronic pre-turbulent phenomena in graphene could be observed, under current experimental conditions, through detectable current fluctuations, echoing the detachment of vortices past localized micron-sized impurities. Vortex generation, due to micron sized constriction, is also explored with special focus on the effects of relativistic corrections to the normal Navier-Stokes equations. These corrections are found to cause a delay in the stability breakout of the fluid as well as a small shift in the vortex shedding frequency. Finally, a relation between the Strouhal number, a dimensionless measure of the vortex shedding frequency, and the Reynolds number is provided under conditions of interest for future experiments.
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