On the collision rate of particles in turbulent flow with gravity

Z. Dodin, T. Elperin

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Formula for the collision rate of inertial particles in a homogeneous isotropic stationary turbulent flow with gravity is derived. The obtained formula yields correct results for two special cases, where the formula by Saffman and Turner [J. Fluid Mech. 1, 16 (1956)] fails. In the case of the particles with the same size, the collision rate predicted by Saffman and Turner is 29% higher than that predicted by the obtained formula. Turbulence effects on the collision rate are estimated for the conditions pertinent to droplets in atmospheric clouds.

Original languageEnglish
Pages (from-to)2921-2924
Number of pages4
JournalPhysics of Fluids
Issue number8
StatePublished - 1 Jan 2002

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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