DOI: 10.1615/TSFP6
A SKIN FRICTION BALANCE APPLIED TO ROUGH WALL EXPERIMENTS
Краткое описание
This paper describes the design of a floating element friction balance which is based around a commercially available micro force balance. The balance has a perfectly linear calibration function and is very flexible as the measurement range may be varied by simply adjusting the length of one of the legs supporting the test surface.
The balance was successfully applied to rough wall flows
in a channel and a diffusor. Both in the favourable pressure gradient flow of the channel and the adverse pressure gradient flow of the diffusor, extrapolation of the turbulent shear stress measured by two component LDA to the wall matched exactly the shear stress measured using the friction balance. Also, the wall shear stress obtained from the balance in the fully developed
channel flow agreed with the stress that could be derived
from the pressure gradient to within 3%.