Measurements of the components of the mean-velocity wall gradient around a yawing cylinder

Use of double-probe polarography to measure the circumferential and transverse components of the velocity wall gradient around a yawing cylinder in a flow impinging perpendicularly to the cylinder axis. The mean value of each component of the velocity gradient is determined from the modulus of the gradient and the angle between the wall velocity gradient vector and the circumferential direction. The evolution of the circumferential gradient is found to be similar to that observed in the case of zero yawing. The transverse gradient, on the other hand, evolves like tan phi.