The 3-D T-mixer aspect ratio has relevant effects on flow patterns and quality of mixing.
Mixing increases drastically for Re up to 100 in the mixing channel in all designs formed by increasing the width of the channel while fixing its height.
Non-stable flows that help on mixing are present with Re > 250 for some aspect ratios of mixing channel.
In the Re range 50–700, the 3-D T-mixer presents better mixing performance than the typical T-mixer for all aspect ratios of mixing channel.