Secondary flow in a boundary layer
The secondary flow in the developing boundary layer of a square duct is investigated experimentally. Measurements of the horizontal components of secondary flow were made for free stream velocities of 3, 6.1, and 12.2 m/s, corresponding to Reynolds numbers based upon the hydraulic diameter of 3.6 x 105, 7 .2 x 105, and 1.4 x 106 at a ratio of L/Dh of 6.7. Measurements of the developing boundary layer parameters and turbulence quantities in a corner were made for the intermediate Reynolds number. The secondary flow and turbulence distribution in a corner are discussed and compared with the fully ...