Pulsatile Flows

Experimental Investigation of fully turbulent pulsatile pipe flows

Master Thesis (2018)
Author(s)

A. Bhadra (TU Delft - Mechanical Engineering)

Contributor(s)

J. Westerweel – Mentor

M. Gül – Mentor

G.E. Elsinga – Coach

R Pecnik – Coach

Andrea Sciacchitano – Coach

Faculty
Mechanical Engineering
Copyright
© 2018 Abhiroop Bhadra
More Info
expand_more
Publication Year
2018
Language
English
Copyright
© 2018 Abhiroop Bhadra
Graduation Date
27-11-2018
Awarding Institution
Delft University of Technology
Faculty
Mechanical Engineering
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

Turbulence is a commonly encountered state of fluid dynamics. Unsteady turbulent flows in pipes are present in many engineering applications and also in biological flows. However, the various processes active in such flows are not well understood. The present work employs stereo-PIV to investigate the effects of a sinusoidal pressure gradient on the various turbulence parameters, including the terms of the turbulent kinetic energy budget equation. The bulk flow rate was oscillated with a frequency of 0.5 Hz with a mean Re 26,000 and an amplitude of modulation, 0.23 times the mean value. It is seen that there is a delay in the response of turbulence to the oscillations of the bulk flow and the delay increases with increasing distance from the wall. The axial and the in-plane turbulence parameters show a difference in the delay of their responses. This delay extends into the small scales responsible for the dissipation of turbulent kinetic energy. Changes are also observed in azimuthal length scales when the flow oscillates.The effects of oscillation on the streaks of low momentum are also discussed and the structural organization in unsteady pipe flows are found to be different from that in steady pipe flows

Files

MSc_thesis.pdf
(pdf | 15.9 Mb)
License info not available