Abstract
Pressure drop characteristics of laminar pulsatile flow in grooved channel with different grooved lengths are investigated experimentally. The experiment are carried out with five kinds of grooved channel, and the Reynolds numbers of the mainstream flow considered in this work ranges from 300 to 525. The sampling data of pressure drop is analysis by amplitude, mean value and phase shift. The result shown that the relation between amplitude and frequency of pulsatile is the same to different grooved channel. It is found that the amplitude trend to constant when f is beyond fc in laminar pulsatile flow. The mean pressure drop increases with the Reynold number, and it also increases with the grooved length increasing. However the mean pressure drop has opposite relationship with frequency in one grooved channel. Furthermore the phase shift between pressure drop and velocity performs more obvious with the frequency increases, while the oscillatory fraction decrease. It also performs obvious in long grooved length of channel.