| Abstract: | The results of an experimental investigation of the kinematic structure and tangential wall stresses are used for an analysis of the time-dependent friction drag and loss of mechanical energy in a turbulent pulsating flow in a round tube. The question of the applicability of the  quasistationary approach to calculation of the friction and the dissipative loss in unsteady flow is discussed.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 160–162, January–February, 1977.We thank O. F. Vasil'ev, on whose initiative and with whose support this work was carried out, and also E. M. Romanov, V. V. Zykov, and P. A. Drozhzhin for their great contribution to the. design of the experimental apparatus and provision of apparatus for the investigations. |
