RISE OF A SINGLE BUBBLE IN ASCENDING LAMINAR FLOW: 
SLIP VELOCITY AND WALL FRICTION

L. S. Timkin, R. S. Gorelik,
and P. D. Lobanov

UDC   532.529.5

An experimental study has been made of the motion of single 
bubbles in ascending laminar flow in a vertical pipe. An electrodiffusion 
procedure has been used for visualization of wall friction in passage 
of a single bubble. Time realization of friction stress is considered 
as the structure frozen-in into the flow and moving along the flow 
together with the bubble. The experiments have revealed the complex 
structure of wall-friction stress, which corresponds to different 
components of interaction of the bubble with the wall. The evolution 
of these components as a function of the Reynolds numbers of the bubble 
and the pipe is discussed.

S. S. Kutateladze Institute of Thermal Physics, Siberian 
Branch of the Russian Academy of Sciences, 1 Akademik Lavrent'ev Ave., 
Novosibirsk, 630090, Russia; email: timkin@itp.nsc.ru. Translated 
from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 4, pp. 129-135, 
July-August, 2005. Original article submitted January 26, 2004.