Particle motions near the bottom in turbulent flow in an open channel. Part 2

Author:

Sumer B. Mutlu,Deigaard Rolf

Abstract

This study continues the investigation of particle motions near the bottom in a turbulent open channel flow, reported by Sumer & Oguz (1978; hereafter referred to as part 1). Paths of suspended heavy particles were recorded in three dimensions and in time, employing a stereo-photogrammetric system coupled with a stroboscope. In the case of smooth bottom, the measured kinematical quantities concerning the particle motions were found to be in accord with the available information on the ‘bursting process’. Agreement between the particle motion and the bursting process provided further support for the mechanism of particle suspension near the bottom proposed in part 1. Similar experiments were carried out when the bottom was rough. Comparison between the smooth- and rough-bottom cases could be made on the same basis as the flow Reynolds number as well as the particle properties were kept almost unchanged in both the smooth and rough boundary experiments. The observations showed that particle motions close to the rough bottom are very similar in character to those in the smooth-bottom case. The findings of the present paper suggested that the suspension mechanism given for the smooth-boundary flow could be extended to the rough-boundary case.

Publisher

Cambridge University Press (CUP)

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics

Reference21 articles.

1. Sumer, B. M. & Oguz, B. 1978 Particle motions near the bottom in turbulent flow in an open channel.J. Fluid Mech. 86,109.

2. Offen, G. R. & Kline, S. J. 1973 Experiments on the velocity characteristics of ‘bursts’ and on the interactions between the inner and outer regions of a turbulent boundary layer.Dept. Mech. Engng, Stanford Univ. Rep. MD-31.

3. Pratury, A. K. & Brodkey, R. S. 1978 A stereoscopic visual study of coherent structures in turbulent shear flow.J. Fluid Mech. 89,251.

4. Monin, A. S. & Yaglom, A. M. 1971 Statistical Fluid Mechanics: Mechanics of Turbulence , vol. 1.Massachusetts Institute of Technology Press.

5. Wallace, J. M. , Brodkey, R. S. & Eckelman, H. 1977 Pattern recognized structures in bounded turbulent shear flows.J. Fluid Mech. 83,673.

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