Fig. 8

a–d Experimental images and e–h simulated streamlines obtained from34, and i–l our simulated streamlines depicting the structure of the flow in the plane \(\hat{x}=0\) for an incompressible Newtonian liquid in a cross-slot channel with aspect ratio 1 under the following conditions: a, e, i \({{{\rm{Re}}}}=15.2\); b, f, j \({{{\rm{Re}}}}=42.8\); c, g, k \({{{\rm{Re}}}}=60.6\) and d, h, l \({{{\rm{Re}}}}=91\). The images a–h are reproduced from34 with permission under open license CC BY 3.0