Abstract
Mean velocity and turbulent intensity measurements have been made for the turbulent boundary layer developed over two-dimensional square rib rough surface with longitudinal micro-grooves. The measurement was performed under a zero pressure gradient and momentum thickness Reynolds number of 8200. The velocity components were measured with a single hot wire probe and a constant temperature anemometer. The mean velocity and turbulent intensity close to the rough surface increase in comparison with those of two-dimensional rough surface. Then, the integral length is about 1.2 times of that the two-dimensional rough surface. As the result, it is expected that an error in origin has a large value compared with that of the two-dimensional rough surface.
