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Type: Conference paper
Title: The influence of Stokes number on particle clustering within a two-phase turbulent jet
Author: Lau, T.
Nathan, G.
Citation: Proceedings of the 7th Australian Conference on Laser Diagnostics in fluid mechanics and combustion, 2015 / pp.1-6
Publisher: Monash University, Dept. of Mechanical Engineering
Issue Date: 2015
ISBN: 9780646948928
Conference Name: Australian Conference on Laser Diagnostics in fluid mechanics and combustion (ACLDFMC) (09 Dec 2015 - 11 Dec 2015 : Melbourne, Australia)
Statement of
Timothy C. W. Lau and Graham J. Nathan
Abstract: The effect of the particle Stokes number on the clustering of solid particles in the near field of a two-phase, turbulent, jet issuing from a long, round, pipe into a low velocity co-flow is investigated through the use of planar nephelometry and statistical box counting. The exit Stokes number was varied two orders of magnitude between 0:3 ≤ Sk0 ≤ 22:4, which resulted in a Reynolds number of 10;000 ≤ ReD ≤ 40; 000. The particle mass loading was fixed at ⏀ = 0:4, resulting in a flow that is in the two-way coupling regime. The results show that the phenomenon of particle clustering at the jet exit is significantly influenced by the exit Stokes number for 0:3 ≤ Sk0 ≤ 5:6. The degree of particle clustering was highest at the lowest investigated Stokes number, Sk0 = 0:3, and lowest for Sk0 > 5:6. Images of two-dimensional slices through three-dimensional clusters appeared as filament-like structures oriented at oblique angles across the jet, whose thickness increased with increasing Sk0. It is postulated that these clusters may be associated with persistent, large-scale streamwise structures that develop within the pipe and that turbophoresis augments particle clustering by causing the mean distribution of particles to be preferentially concentrated along the pipe boundary.
Rights: Copyright status unknown
RMID: 0030048094
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Appears in Collections:Mechanical Engineering conference papers

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