Dynamics of a spherical particle in mixed convection flow field

E. Mograbi, E. Bar-Ziv

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Numerical and experimental study on steady mixed convection gas flow around a hot spherical particle is presented for small values of Reynolds and Grashof numbers and all mixed convection parameter range. The flow regimes considered are the axis-symmetric co-flow and opposed flow for the non-dimensional Boussinesq model. The sensitivity of the numerical computations with respect to the dimension of the computational domain is discussed. The opposed flow regime and the formation of re-circulation secondary flow is analyzed. A qualitative expression for the drag force induced on the particle by the flow is given for all range of the mixed convection parameter, the expression holds for the co-flow configuration but brakes up in the opposed flow regime when re-circulation secondary flow evolves. Experimental measurements of the drag force induced on a small spherical particle allows further examination of the numerical computations and theory.

Original languageEnglish
Pages (from-to)387-409
Number of pages23
JournalJournal of Aerosol Science
Volume36
Issue number3
DOIs
StatePublished - 1 Jan 2005

Keywords

  • Buoyancy
  • Drag force
  • Forced-convection
  • Free convection
  • Mixed convection

ASJC Scopus subject areas

  • Environmental Engineering
  • Pollution
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Atmospheric Science

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