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首页> 外文期刊>International Journal of Heat and Fluid Flow >Localisation of optimal perturbations in variable viscosity channel flow
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Localisation of optimal perturbations in variable viscosity channel flow

机译:可变粘度通道流动中最佳扰动的定位

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摘要

We discuss how a variable fluid viscosity affects the nonmodal stability characteristics of the pressure driven flow between two parallel walls maintained at different temperatures. In this work, we specify the fluid viscosity to be a function of the fluid temperature. We employ an Arrhenius model to model the viscosity of water, and Sutherland's law to model the viscosity of air. We impose a stable density stratification, and find that strong density stratification can suppress optimal transient growth regardless of how strong the viscosity variation is. Some studies have been inclined to neglect viscosity stratification, since the changes in levels of optimal growth, when compared to the uniform viscosity case, are often not too significant. In this article, we show significant localisation of optimal perturbation energy in the less viscous region, a feature that is not observed in uniform viscosity flows. This can have a bearing on the route to turbulence in these systems.
机译:我们讨论如何使可变流体粘度如何影响在不同温度的两个平行壁之间的压力驱动流的非透射流量的非透析稳定性特性。在这项工作中,我们将流体粘度指定为流体温度的函数。我们采用了Arrhenius模型来模拟水的粘度,并苏凯兰定律模拟空气粘度。我们强加稳定的密度分层,发现强密度分层可以抑制最佳的瞬态生长,无论粘度变化如何强度。一些研究倾向于忽略粘度分层,因为与均匀粘度案例相比,最佳生长水平的变化往往不会太大。在本文中,我们显示了在较低粘性区域中的最佳扰动能量的显着定位,在均匀粘度流动中未观察到的特征。这可以对这些系统中的湍流途径具有轴承。

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