There is an useless energy consumption in the forced vortex.
强制涡内存在无益的能量耗损；
The results, compared with non vortex flow, are that effect of vortex flow on forced heat transfer is obvious.
实验表明，涡旋流动有明显的强化传热作用。
In the separation space, the outer vortex can be approximately regarded as quasi-free vortex and inner vortex as quasi-forced vortex.
分离空间内时均流场是外侧准自由涡与内侧准强制涡的典型结构。
The formation mechanism and properties of forced vortex in a hydrocyclone and its influence on the performance of the cyclone are studied systematically and thoroughly in this paper.
本文对水力旋流器中强制涡的形成，性质及作用等方面进行了较全面的深入探讨。
It is found that: the center of the cyclone separation is a forced upward rotation vortex; the external is a quasi-free downward rotation vortex.
研究发现：旋风分离器的中心为向上旋转的强制涡，外部为向下旋转的准自由涡。
Vortex also called left turn, is the axis of rotation happened a self-excited vibration, it is neither has the free vibration characteristics, also do not belong to the type of forced vibration.
涡动又称甩转，是旋转轴发生的一种自激振动，它既不具有自由振动的特征，也不属受迫振动的类型。
Vortex also called left turn, is the axis of rotation happened a self-excited vibration, it is neither has the free vibration characteristics, also do not belong to the type of forced vibration.
涡动又称甩转，是旋转轴发生的一种自激振动，它既不具有自由振动的特征，也不属受迫振动的类型。
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