Thermal and dynamic characteristics of the separated flow behind a flat rib with different angles of alignment toward the flow

Results of an experimental study of a turbulent flow past a flat rib with different angles of alignment toward the flow and with different rib heights are presented. The angle of rib alignment toward the flow is varied within $\varphi=50-90^\circ$. Vortex formation is visualized, and the coordinates of the reattachment line are determined. It is demonstrated that a decrease in the angle $\varphi$ forms a reattachment region and makes the flow behind the rib more three-dimensional. Pressure coefficients are measured in different longitudinal sections of the channel behind the rib with a varied angle of rib alignment $\varphi$. Temperature fields on the surface behind the rib are measured by means of an infrared imager and by thermocouples, and the corresponding heat-transfer coefficients are calculated. The effect of the angle of rib alignment toward the flow and the rib height on dynamic and thermal characteristics of the separated flow is analyzed.