For the flow of a jet or a wake, we may consider a flow field without solid boundary but with a pointofinflection in the velocity profile.
射流或尾流可视为无固壁边界而流场速度剖面具有拐点的流动。
2
The pointofinflection from low elasticity region characteristics to high elasticity region characteristics in a stress-strain curve is preferably set in a range of 2 to 7 % of strain.