Two types of intermittency of passive scalar fluctuations

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Abstract

Turbulent transport of passive scalar (e.g., number density of particles) advected by an incompressible fluid flow in the case U = v was studied in a large number of publications. Here U is the particle velocity and v is the velocity of fluid. Interesting features in turbulent transport of passive scalar appear when U ≠ v. In this case new phenomena, e.g., turbulent thermal diffusion and turbulent barodiffusion [1], and self-excitation, i.e., exponential growth of fluctuations of the number density of inertial particles [2] occur. These effects are caused by inertia of particles which results in a divergent velocity field of particles. The self-excitation of the fluctuations results in the intermittency in spatial distribution of inertial particles [2].

Original languageEnglish
Pages (from-to)511-514
Number of pages4
JournalFluid Mechanics and its Applications
Volume46
DOIs
StatePublished - 1 Jan 1998

Keywords

  • Inertial Particle
  • Particle Concentration
  • Passive Scalar
  • Reynolds Number
  • Turbulent Transport

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