Abstract
The effect of suction on a turbulent flow through a cylindrical conduit of annular section is investigated experimentally. The author presents the pattern of evolution of the mean longitudinal velocity profiles and of the coefficients of friction at the walls. The “pseudo-velocity” is correctly represented by an expression proposed by Simpson et al. The wall flows, relating to the small tube and the large tube, can be considered to be virtually independent of each other for the suction magnitudes used. The author also proposes an empirical relation which gives the position of the maximum mean velocity as a function of the ratio of the radii in the absence of suction.
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