2006/10/19 by Jacob Berg, J. Berg, Berg, J. +9
Engineering · Environmental Science · Physics and Astronomy · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Turbulent Flows #Hydrology and Sediment Transport Processes #Particle Dynamics in Fluid Flows #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.physics/0610150
13 pages, 7 figues
arxiv created 2006/10/19 · openalex publication_date 2006/10/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A Particle Tracking Velocimetry experiment has been performed in a turbulent flow at intermediate Reynolds number. We present experimentally obtained stretching rates for particle pairs in the inertial range. When compensated by a characteristic time scale for coarse-grained strain we observe constant stretching. This indicates that the process of material line stretching taking place in the viscous subrange has its counterpart in the inertial subrange. We investigate both forwards and backwards dispersion. We find a faster backwards stretching and relate it to the problem of relative dispersion and its time asymmetry.