Pulsating laminar flow field and resistance characteristics in rectangular channel are investigated analytically and experimentally. Mathematical model is established. The influences of flow fluctuation period on the flow field in rectangular channel are analyzed. The velocity gradient in the pulsating laminar flow is compared with that in the steady laminar. Analytical results are verified by experiment.
The results show that flow pulsation causes phase difference between the velocity and pressure drop. Compared with steady flow filed, the flow field changes a lot under pulsating condition due to the oscillating velocity component. The velocity gradient in the pulsating laminar flow is changed periodically by the oscillating velocity component, which leads some change in friction coefficient.