Abstract
The flow characteristics with the same oscillatory fraction in the grooved channel for pulsatile flow have been conducted experimentally. The results showed that for the same oscillatory fraction, the pressure drop decreases monotonously with the frequency of the pulsatile flow in the laminar flow and transitional flow, while it has an inflection point and then increases in the turbulent flow. On the other hand, the local pressure has few changes with the overall pressure drop in laminar and turbulent flow, but it behaves randomly in the transitional flow. The above results are very important for the design of the efficient heat exchanger.