Abstract
The visualization of pulsatile flow in a wavy-walled tube for low flow rates is conducted by the aluminum dust method. We pay attention to the effect of Strouhal number on flow behaviors. It is found that, generally, the flow tends to remain stable in the accelerating phase and unstable in the decelerating phase. There exists a peak mass transfer enhancement at an intermediate Strouhal number, where inertia effects dominate the flow, while at low and high Strouhal numbers, the mass transfer enhancement is reduced, and the flows remain relatively stable.
