Local wall shear stress measurement with Sublayer plate

摘要

The local wall shear stress measurement technique has been developed using a thin plate called as "sublayer plate" attached to the wall in the sublayer of the wall turbulent flows. Pressure difference between forward and backward edges of the plate is correlated to known wall shear stress obtained in the fully developed turbulent channel flow. The calibration curve can be well represented in dimensionless group and the new method has sensitivity as high as that of the sublayer fence, even if it is submerged in the linear sublayer. The additional experiments prove that the sublayer plate has reasonable angular resolution to detect the local wall shear stress direction.