RELAMINARIZATION OF WALL TURBULENCE BY HIGH-PRESSURE RAMPS AT LOW REYNOLDS NUMBERS
2016
Reverse transition from the turbulent towards the laminar flow regime was
investigated experimentally by progressively increasing the pressure up to
400 MPa in a fully developed pipe flow operated with silicone oil as the
working fluid. Using hot-wire anemometry, it is shown indirectly that at low
Reynolds numbers a rapid increase in pressure modifies the turbulence
dynamics owing to the processes which induce the effects caused by fluid
compressibility in the region very close to the wall. The experimental
results confirm that under such circumstances, the traditional mechanism
responsible for self-maintenance of turbulence in wall-bounded flows is
altered in such a way as to lead towards a state in which turbulence cannot
persist any longer.
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