Investigation of laminar sublayer on permeable surfaces with injection

Effect of blowing and suction on characteristics of the viscous sublayer in a turbulent flow

“…3 (dashed lines), there is a linear velocity distribution at a sufficiently large distance from the wall in the case of blowing. The linear character of the velocity and concentration profiles in the boundary region in blowing was noted earlier in the works [7,12].…”

“…The experimental data for suction agrees satisfactorily with the results of calculations obtained on the basis of energy analysis of the stability of the viscous sublayer. Figure 2 also shows experimental data for blowing obtained by the method of tracing a flow of particles [13] (points 6) and by the interferometric method [ii] (7). The data shown does not allow a preference to be expressed for any one of the hypotheses examined for blowing.…”

“…The hypotheses advanced in [5,6] are equivalent to the condition Re2 = const [2]. In analyzing the effect of transverse mass flow on the viscous layer in [3,7], it was held that suction must increase --and blowing must decrease --the stability of the laminar section near the wall.…”

“…The wave parameters of two-phase film flows was studied in [1- 5,6,7]. These studies pertain mainly to two-phase annular flows with thin films of liquids (Req < 4000) and high gas velocities (Vg > 20 m/sec), i.e., for flows in which drop removal from the surface of the liquid film is seen [2].…”