Аннотация:https://www.springer.com/gp/book/9783030535209The evolution of steady flows of a incompressible and viscous fluid is analyzed in a plane diffuser. For the classical formulation of the Jeffery-Hamel problem velocity profiles of flows are given. The evolution of basic single-mode flow for a fixed expansion angle into complex flows with inflow and outflow sectors (multi-mode flows) is found. The Reynolds number values corresponding to this bifurcation are calculated. It determines, in particular, that after bifurcation the single mode is impossible, while Reynolds number isgrowing. Also, the second bifurcation domain is explored.