In this paper

heat transfer enhancement in the triangular grooved channel by a laminar pulsating flow is studied. The influence of several main parameters on heat transfer enhancement is analyzed. The parameters are Reynolds number

Strouhal number and pulsation amplitude. The experimental results show that the enhancement of heat transfer rate increases with the Reynolds number and pulsation amplitude

and there exists an optimal Strouhal number for the greatest enhancement of heat transfer in the triangular grooved channel. To analyze the correlation between the pulsating flow behaviors and the heat transfer enhancement characteristics

the PIV investigation is performed. The PIV results show that the heat transfer enhancement results from the strong mixing caused by the repeating sequence of vortex generation

growth

expansion and ejection from the groove to the main stream by the pulsating flow. The repeating sequence of vortex variation changes the flow pattern

which leads to destroy the boundary layer and make the mixing speed faster in the different zones. What's more

the numerical research has been conducted to investigate the synergy of the temperature

velocity and pressure fields on the laminar pulsating flow in a triangular grooved channel. The numerical results indicate that an increase of the intersection angle between velocity and pressure gradient improves the synergy between the velocity and pressure fields with an equal heat transfer enhancement

resulting in a reduction of penalty of pressure drop. Therefore

the improvement of three-field synergy is the basic mechanism for the heat transfer enhancement in the triangular grooved channel by a laminar pulsating flow.