Transition to Turbulence in a Pulsatile Pipe Flow : Part 2, Characteristics of Reversing Flow Accompanied by Relaminarization

Abstract

The instantaneous velocity distributions and pressure gradients in a reversing pulsatile flow and an oscillatory flow in which turbulent bursts follow by relaminarization in the same cycle are investigated. They are predicted with sufficient accuracy by the theory for a transient pulsatile laminar flow in the laminar phase. Meanwhile, in the phase where turbulence with higher frequency appears, they are well approximated by the well-known 1/7 power law and the turbulent quasi-steady friction law respectively.