Flow through expanding axisymmetric ducts. Δ (mixed-out loss)/(inlet mixed-out loss) for a wake and two vortices of differing swirl numbers (0.42 and 0.83) as a function of pressure rise on the outer wall $ΔCp=Δp/12ρUs2$⁠. The initial core velocity ratio in each case is 0.6. Velocity contours for cases A–E are shown in Fig. 7.