流量的福劳德数是流动状态的影响因素，即超临界流或亚临界流。
The Froude number of flow is the factor of flow status: supercritical flow or subcritical flow.
前言：超临界流体具有黏度低、密度大，有较好的流动、传质、传热和溶解性能等特性。
The supercritical fluid has the following unique characteristics: low viscosity, high density, better performance of flow, mass and heat transfer, dis solution and so on.
在超临界范围内，流动非对称由非对称涡以及非对称边界层流动的综合作用形成。
In super critical Reynolds number range, flow asymmetry is induced by both the asymmetric vortices and asymmetric boundary layer state.
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