Transition to Turbulence in the Presence of Finite Size Particles

Lashgari, I.; Picano, F.; Breugem, W.P.; Brandt, L.

doi:doi:10.1016/j.piutam.2015.03.042

Transition to Turbulence in the Presence of Finite Size Particles

Title

Transition to Turbulence in the Presence of Finite Size Particles

Author

Lashgari, I.
Picano, F.
Breugem, W.P.
Brandt, L.

Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Date

2015-07-02

Abstract

We study the transition from laminar to turbulent flow in a channel seeded with finite-size neutrally buoyant particles. A fixed ratio of 10 between the channel height and the particle diameter is considered. The flow is examined in the range of Reynolds numbers 500 ? Re ? 5000 and the particle volume fractions 0.001 ? ? ? 0.3. We report a non-monotonic behavior of the threshold value of the Reynolds number above which the flow becomes turbulent, in agreement with previous experimental studies. The mean square velocity fluctuations and Reynolds shear stress of the fluid phase are reduced by increasing the particle volume fraction at a fixed Re=1500, while the mean square velocities of the solid phase are enhanced monotonically suggesting a transition from fluid to particle dominated dynamics at high volume fraction.

Subject

transition
finite-size particles
inertial suspensions

To reference this document use:

http://resolver.tudelft.nl/uuid:5a1b2763-4b90-411b-9cd9-93a760207ed8

Publisher

Elsevier

ISSN

2210-9838

Source

https://doi.org/10.1016/j.piutam.2015.03.042

Source

Procedia IUTAM, 14, 2015; IUTAM ABCM Symposium on Laminar Turbulent Transition, Rio de Janeiro, Brazil, 8-12 September 2014