根据流体力学的原理，任何系统都趋向于处在能量最小的稳定状态，所以在环状流的稳定流动状态下具有的能量应该最小。
According to the principle of the fluid mechanics, any system all tend towards to minimum steady state of energy, so the energy in steady flow of annular flow will be minimum.
研究了微可压缩流体在斜井内的不稳定流动状态，给出了数学模型，推导出了油井的完善程度和油井倾斜造成的表皮因子的计算式。
This paper analyzes the unsteady-state flow of a slightly compressible fluid into a slanted well and gives an equation for calculating the partial penetration and slanting of a well.
这种转移是不稳定的，回流性较强，因此，中国农村劳动力大多处于流动状态，而不是向城市较稳定的转移。
This kind of migration is unsteady and the reflux is stronger. Therefore, Chinese rural labor forces are in a floating condition instead of transferring stably toward the city.
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