EXPERIMENTAL STUDY OF FRICTION STRESS ON THE WALL 
OF A CYLINDRICAL TUBE IN AN OSCILLATING TURBULENT 
FLOW OF A LIQUID 
E. D. Barbashov, B. F. Glikman, and A. A. Kazakov

UDC 532.517.6

Results of experiments where the nonstationary friction 
stress in an oscillating flow in a cylindrical tube was measured by 
a mechanical sensor within rather wide ranges of frequency 1-160 Hz 
and Reynolds number 1.7x104 - 1.2x105 are presented. A technique is suggested 
for calculating dynamic characteristics for the friction stress within 
three ranges of frequency, for which quasistationary and quasilaminar 
models of flow and a model for the intermediate frequency range are 
applicable. On the basis of experimental data, an approximation relation 
for the transmission ratio of the friction stress as a function of 
the dimensionless frequency is suggested.

JEPTER74920200016
JEPTER7492016