Saltation length and velocity of granules in air flow

E. Rabinovich, Y. Weiss, H. Kalman

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


Saltation velocity is one of the key design parameters in pneumatic conveying systems. The aim of this work is to study the mechanism of saltation. Experimental results of saltation velocity in a wind tunnel with very dilute flow are presented. Experiments were carried out with various spherical and non-spherical particles. At each velocity the distribution of halted particles along the tunnel bottom was measured. From this length distribution the median length was found for further analysis. It was found that the median saltation length approaches infinity at a certain threshold velocity. By testing many materials the saltation length was found to be a function of Re and Ar numbers. Moreover, the boundary saltation velocity was found to follow a simple correlation of Re as a function of Ar number. The saltation length is an accumulation of three lengths: first flight, rebound and rolling/sliding. By analysing the three affecting lengths the total saltation length and the boundary saltation velocity can be defined simply.

Original languageEnglish
StatePublished - 1 Dec 2006
Event2006 AIChE Spring National Meeting - 5th World Congress on Particle Technology - Orlando, FL, United States
Duration: 23 Apr 200627 Apr 2006


Conference2006 AIChE Spring National Meeting - 5th World Congress on Particle Technology
Country/TerritoryUnited States
CityOrlando, FL


  • Boundary saltation velocity
  • Gas-solid flow
  • Pickup velocity
  • Saltation length
  • Saltation velocity

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Chemistry (all)


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