Occurrence of rotational motion resulting from hydrodynamic instability

It is shown that the stable secondary regime of a parallel flow simulating the entrance length of a jet includes a steady differential rotation. The mechanism of occurrence of nonzero angular momentum is discussed and a comparison is made with the available experimental data.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 51–59, September–October, 1985.