Coupling of fluctuating vorticity and voidage fluxes in free shear flows

Xiaogang Yang, Neale Thomas, Liejin Guo

Research output: Contribution to conferencePaperpeer-review

Abstract

The key role played by large scale eddies in turbulent free shear dispersion of particles and bubbles is now well documented, and our earlier demonstrations (Sene et al. 1994; Yang 1996) have shown that local dispersed phase (voidage) transport is highly correlated with transient vorticity. We now seek to quantify the couplings between the fluxes of fluctuating vorticity and bubbles or particles, utilising the simulations described in Yang (1996) and following the methods of Sene et al. (1994), that is by sampling the Lagrangian trajectories at different positions within an Eulerian frame. Our results show that the correlation between the fluctuation fluxes is higher in the core region of the mixing layer for bubbles, but lower for particles, as compared with the correlation along the edges of the mixing layer for particles. This finding is both consistent with and quantifies previous results (Sene et al. 1994; Martin & Meiburg 1994) on trapping confinement of bubbles and centrifuged expulsion of particles, the latter hovering around the edges of the large scale vortices in the mixing layer.

Original languageEnglish
Pages105-112
Number of pages8
Publication statusPublished - 1997
Externally publishedYes
EventProceedings of the 1997 International Symposium on Multiphase Flow, ISMF'97 - Beijing, China
Duration: 7 Oct 199711 Oct 1997

Conference

ConferenceProceedings of the 1997 International Symposium on Multiphase Flow, ISMF'97
CityBeijing, China
Period7/10/9711/10/97

ASJC Scopus subject areas

  • General Engineering

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