Abstract
Experiments and simulations are combined to study flows in a T-mixer with offset inlets, whose stability is coupled to the vortex breakdown structure in the system. This leads to an unexpected flow regime in which increasing the flow rate can re-stabilize steady-state solutions of the flow.
Highlights
Swirling flows are flows which rotate about an axis; a typical example is tornado
Spiral-type breakdown is instead characterized by a single internal stagnation point followed by a helical motion of the vortex core downstream
The vortex T-mixer flow that we have studied here demonstrates several fluid dynamical features
Summary
Swirling flows are flows which rotate about an axis; a typical example is tornado. They exhibit a diverse range of fluid dynamical behaviors as the viscous dissipation, shear, and centrifugal stresses interact. Bubble-type breakdown is characterized by a nominally axisymmetric flow recirculation zone that is bounded by upstream and downstream internal stagnation points. Spiral-type breakdown is instead characterized by a single internal stagnation point followed by a helical motion of the vortex core downstream. In this case, a tracer filament will kink at the location of the stagnation point and flutter helically downstream [5]. The bubble-type is the more basic form of vortex breakdown
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