1. While the typical heat transfer signatures relevant to the angled ribs emerge clearly over present ribbed endwalls, the present high endwall Nu zones behind the angled ribs are extended from those developed in ribbed two-pass channels with flat sidewalls. With the co-swirls tripped by present 45 endwall ribs and skewed sidewall waves, the twin-peak endwall centerline Nu profiles are induced over the bend region. As the Den-type vortices through sharp bend interact with the vortical flows tripped by present endwall-ribs and sidewall-waves to further boost the HTE impacts, the significant NuTR elevations from the comparative counterparts obtained from the two-pass ribbed channels with flat sidewalls are observed.