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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

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

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

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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