THERMAL SCIENCE

International Scientific Journal

K. Song

,

Jovan Jovanović

,

A. Al-Salaymeh

,

C. Rauh

,

A. Delgado

RELAMINARIZATION OF WALL TURBULENCE BY HIGH-PRESSURE RAMPS AT LOW REYNOLDS NUMBERS

ABSTRACT
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.
KEYWORDS
relaminarization, wall turbulence, high pressure ramp
PAPER SUBMITTED: 2015-10-15
PAPER REVISED: 2016-04-15
PAPER ACCEPTED: 2016-04-18
PUBLISHED ONLINE: 2016-04-24
DOI REFERENCE: https://doi.org/10.2298/TSCI151015085S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Supplement 1, PAGES [S93 - S102]
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Relaminarization of wall turbulence by high-pressure ramps at low Reynolds numbers

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