On the Possibility of Reducing Friction due to Relaminarization of the Flow in the Pipe

Using the differential turbulence model, a numerical study of the possibility of relaminarization of the flow in a pipe is carried out for three variants of input devices with different velocity profiles and small-scale turbulence. The most promising is the experimentally investigated option with the organization of a two-zone flow with a slowed flow in the central region of the pipe and accelerated flow in the wall region. In this variant, the Reynolds number of relaminarization Re* is 16000. It is shown that a further increase in the number of Re* can be obtained by decreasing the turbulence intensity and turbulence scale at the inlet.