Fluid dynamics, turbulence and mixing
Mixing, no matter laminar or turbulent, as widely exist in daily life, has great importance in science and industry. Our lab focused on high efficient laminar and turbulent mixing with low energy cost and space saving. Right now, experiment is the major research method we used. For furture, simulations will follow up.
Figure 1. This is the wake flow at Re=3000(Re=UD/ν) without actuating. From the figure, the natural frequency of Kármán vortex street is about 7.8Hz.
Figure 2. This is the actuated flow at Re=3000. The actuating frequency is 7.8Hz which is the natural freuqncy of wake flow. The actuating intensity is 305.8% compared with mean flow. Clear vortex rolling up and stretching can be found in this figure. Although the spreading angle is limited, there is still some mixing at the downstream of the chamber.
Figure 3. This is the actuated flow at Re=3000. The actuating frequency is 5.3Hz. The actuating intensity is 305.8% too. Although the intensity is the same, much faster mixing can be achieved at this frequency. |
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