Hydrodynamic modeling of dense gas-particle turbulence flows under microgravity space environments

Y. Liu (Corresponding Author), G. Li, Sirpa Kallio

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

An Euler–Euler two-fluid model based on the second-order-moment closure approach and the granular kinetic theory of dense gas-particle flows was presented. Anisotropy of gas-solid two-phase stress and the interaction between two-phase stresses are fully considered by two-phase Reynolds stress model and the transport equation of two-phase stress correlation. Under the microgravity space environments, hydrodynamic characters and particle dispersion behaviors of dense gas-particle turbulence flows are numerically simulated. Simulation results of particle concentration and particle velocity are in good agreement with measurement data under earth gravity environment. Decreased gravity can decrease the particle dispersion and can weaken the particle–particle collision as well as it is in favor of producing isotropic flow structures. Moreover, axial–axial fluctuation velocity correlation of gas and particle in earth gravity is approximately 3.0 times greater than those of microgravity and it is smaller than axial particle velocity fluctuation due to larger particle inertia and the larger particle turbulence diffusions.
Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalMicrogravity Science and Technology
Volume23
Issue number1
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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Keywords

  • Dense gas-particle turbulence flows
  • Microgravity
  • Numerical simulation
  • Second-order-moment closure

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