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Experimental verification for the prediction of particle path and particle Reynolds number using local Stokes number

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2550
pages 2459-2470

Yoshimichi Hagiwara
Department of Mechanical and System Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

Hideto Fujii
Department of Mechanical and System Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

A. Kitagawa
Department of Mechanical and System Eng., Kyoto Institute of Technology, Goshokaidocho Matugasaki Sakyo-ku Kyoto 606-8585, Japan


We carried out measurements on the motion of aluminum balls, which were introduced one by one into turbulent downward duct flow, in order to verify our previous prediction (Hagiwara, Flow, Turbulence and Combustion, Vol. 86, pp. 343 − 367) of the motion of a high-density ball in turbulent downward duct flow. The experimental result for the local Stokes number as a function of time was lower than that predicted. On the other hand, the experimental results for both the distance of the ball from a duct wall and the particle Reynolds number for the ball as functions of time are in agreement with those respectively predicted. These results were due to the fact that the number of tracer particles in a specific volume around the ball is not enough for the evaluation of local flow time scale, but enough for the evaluation of relative velocity between the flow in the volume and the ball.

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