| Abstract: | A specially developed stroboscopic instrument has been used to measure the instantaneous velocities in the wall region (including the viscous sublayer) in a turbulent liquid (water) duct flow. Values of the average velocity and the turbulent fluctuations are found as a function of the distance from the wall. The method employed is much simpler than hot-wire anemometry, although somewhat less accurate.The author thanks V. M. Karsten and E. S. Mikhailov for their assistance with the experiments and E. M. Khabakhpashev for his useful advice. |
