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Gravity effects on particle dynamics in wall turbulence

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Particle dynamics in a vertical channel flow is considered with focus on the slip velocity between the fluid phase and the inertial spherical particles. Five different particle Stokes numbers from 1 to 100 were considered in a Reτ = 395 flow. Data for the mean slip velocity were mostly in accordance with our expectations, whereas counter-intuitive results for the fluctuating slip velocity were found. These await further interpretations.

Author(s):

Helge I. Andersson    
Norwegian University of Science and Technology
Norway

Christopher Nilsen    
Norwegian University of Science and Technology
Norway

Lihao Zhao    
Norwegian University of Science and Technology
Norway