Mechanics of flow and mixing at antroduodenal junction

Figure 11 A temporal progression of scalar species (left) and vorticity (right) during one complete inlet pulse cycle (3. 5 time units) through the closing asymmetric pylorus: A: t = 1.25 time units, with the vortical jet becoming apparent as inlet velocity is maximized and luminal narrowing occurs; B: t = 2.5 time units. The lumen is fully closed, and the inlet velocity has returned to 0.0; C: t = 3.5 time units. The pylorus has returned to its original open state during the 1.0 time unit refractory period. Strong, stable regions of vorticity remain, entraining weaker unstable vortices and further stretching the species.