Heat and Mass Transport Characteristics of Pulsating Flow in a Rectangular Duct Part 1:
Effect of pulsating frequency on heat transfer around a flat plate installed in the duct
This study deals with flow behavior and associated heat transfer in a pulsating duct flow. As well as mechanical engineers, researchers in the bioengineering field also focus on heat and mass transport characteristics of pulsating flow from the viewpoint of life science. PIV and color schlieren visualization was applied to flow and temperature fields, respectively, in order to investigate the effect of flow pulsation on convection heat transfer around a flat plate installed in the duct. Results showed that flow pulsation induced complicated spatial velocity distributions with temporal fluctuation of flow rate. It is concluded from these experimental results that heat transfer enhancement or no impact of pulsation effect on heat transfer depends on the increase or constant of time-averaged local flow rate around the flat plate induced by flow pulsation. The pulsating frequency strongly influences such flow structure.
Keywords: Heat Transfer, Flow Pulsation, Pulsating Frequency, Color Schlieren Method, Flow Visualization, Velocity Fluctuation, PIV