EXPERIMENTAL STUDY OF THE FRICTION STRESSAND TRUE
GAS CONTENT IN UPWARD BUBBLY FLOWIN A VERTICAL TUBE

O. N. Kashinckii, L. S. Timkin,R. S. Gorelik, and P. D. Lobanov

UDC 532.529.5

An experimental study of the laminar, transient, and turbulent conditions
of the flow of monodispersed gas-liquid mixtures with one- and two-millimeter
bubbles has been made. Tube-parameter-averaged data on the development
of friction stress on the wall and its pulsations have been obtained.
The asymmetry parameter characterizing the nonuniformity of the friction stress 
distribution along the tube perimeter has been introduced. Flow conditions with
a strong asymmetry have been revealed. The true gas content has been calculated
by the Zuber-Hench formula [1]. For flow conditions with wall peaks of the gas
content, the calculation data are in good agreement with the experimental data.

Institute of Thermal Physics, Siberian Branch of the Russian Academy of Sciences,
1 Akad. Lavrent'ev Ave., Novosibirsk, 630090, Russia; email: timkin@itp.nsc.ru.
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, No. 6, pp. 68-80,
November-December, 2006. Original article submitted February 16, 2005.