Hydrodynamic Forces Generated on a Spherical Sediment Particle during Entrainment
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 10
Abstract
The objective of this research is to study the relationship between the coherent flow structures and the hydrodynamic forces leading to entrainment of a spherical bed sediment particle for a rough bed uniform turbulent flow. Two types of experiments, namely, movable and fixed balls, were conducted using spherical roughness-element beds with particle image velocimetry to measure the instantaneous flow-velocity field. Miniature piezoelectric pressure sensors were used to capture the instantaneous pressure on the surface of the sphere. Movable ball experiments reveal the predominance of large sweep structures at the instant of entrainment. Fixed ball experiments carried out at entrainment conditions show the importance of both vertical and horizontal pressure gradients on the ball leading to entrainment. Probability distribution function plots of pressures based on quadrant analysis of velocities also reveal the higher probability of occurrence of high magnitude force induced by sweep events.
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Acknowledgments
The writers gratefully acknowledge the support of Professor Arved J. Raudkivi in encouraging the research, suggesting the experimental setup and reading the first draft. The writers also acknowledge the support provided by Tushar K. Guha, Graduate Student, Department of Mechanical Engineering, The University of Auckland, New Zealand, in preparing response to reviewers.
References
Buffington, J. M., Dietrich, W. E., and Kirchner, J. W. (1992). “Friction angle measurements on a naturally formed gravel streambed: Implications for critical boundary shear stress.” Water Resour. Res., 28(2), 411–425.
Cameron, S. M. (2006). “Near boundary flow structure and particle entrainment.” Ph.D. thesis, Univ. of Auckland, Auckland, New Zealand.
Canny, J. F. (1986). “A computational approach to edge detection.” IEEE Trans. on Pattern Analysis and Machine Intelligence, 8(6), 679–698.
Chin, C. (1985). “Stream bed armouring.” Technical Rep. No. 403, School of Engineering, The Univ. of Auckland, Auckland, New Zealand.
Cleaver, J., and Yates, B. (1976). “The effect of re-entrainment on particle deposition.” Chem. Eng. Sci., 31, 147–151.
Constantinescu, G. S., and Squires, K. D. (2003). “LES and DES investigations of turbulent flow over a sphere at .” Flow, turbulence and combustion ERCOFTAC Journal, 70, 267–298.
Detert, M. (2008). “Hydrodynamic processes at the water-sediment interface of streambeds.” Ph.D. thesis, Univ. of Karlsruhe, Karlsruhe, Germany.
Diplas, P., Clint, D. L., Ahmet, O. C., Manousos, V., Krista, G., and Tanju, A. (2008). “The role of impulse on the initiation of particle movement under turbulent flow conditions.” Science, 322, 717–720.
Dyer, K. R., and Soulsby, R. L. (1988). “Sand transport on the continental shelf.” Annu. Rev. Fluid Mech., 20(1), 295–324.
Einstein, H. A., and El-Samni, E. A. (1949). “Hydrodynamic forces on a rough wall.” Rev. Mod. Phys., 21, 520–524.
Fenton, J. D., and Abbott, J. E. (1977). “Initial movement of grains on a stream bed: The effect of relative protrusion.” Proc. R. Soc. London, Ser. A, 352, 523–537.
Grass, A. J. (1983). The influence of boundary layer turbulence on the mechanics of sediment transport, B. M. Sumer and A. Muller, eds., Balkema, Rotterdam, The Netherlands, 3–17.
Hofland, B. (2005). “Rock and roll.” Ph.D. thesis, TU Delft, The Netherlands.
Johnston, C. E., Andrews, E. D., and Pitlick, J. (1998). “In situ determination of particle friction angles of alluvial gravels.” Water Resour. Res., 34(8), 2017–2030.
Kaftori, D., and Hetsroni, G. (1998). “The effect of particles on wall turbulence.” Int. J. Multiphase Flow, 24(3), 359–386.
Kline, S. J., Reynolds, W. C., Schraub, F. A., and Runstadler, P. W. (1967). “The structure of turbulent boundary layers.” J. Fluid Mech., 30, 741–773.
Nelson, J., Shreve, R. L., McLean, S. R., and Drake, T. G. (1995). “Role of near-bed turbulence structure in bed load transport and bed form mechanics.” Water Resour. Res., 31(8), 2071–2086.
Ninto, Y., and Garcia, M. H. (1996). “Experiments on particle-turbulence interactions in the near-wall region of an open-channel flow: Implications for sediment transport.” J. Fluid Mech., 326, 285–319.
Rashidi, M., Hetsroni, G., and Banerjee, S. (1990). “Particle-turbulence interaction in a boundary layer.” Int. J. Multiphase Flow, 16, 935–949.
Raudkivi, A. J. (1990). Loose boundary hydraulics, 3rd Ed., Pergamon, Tarrytown, NY.
Sumer, B. M., and Deigaard, R. (1981). “Particle motions near the bottom in turbulent flow in an open channel.” J. Fluid Mech., 109, 311–338.
Teruzzi, A., Ballio, F., and Armenio, V. (2009). “Turbulent stresses at the bottom surface near an abutment: Laboratory-scale numerical experiment.” J. Hydraul. Eng., 135(2), 106–117.
Wang, J. (1999). “Hydrodynamic lift and drag fluctuations of a sphere.” Ph.D. thesis, The Pennsylvania State Univ., Univ. Park, Pa.
Xingkui, W., and Fontijn, H. L. (1993). “Experimental study of the hydrodynamic forces on a bed element in an open channel with a backward-facing step.” J. Fluids Struct., 7, 299–318.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 10 • October 2010
Pages: 756 - 769
Copyright
© 2010 ASCE.
History
Received: Jul 7, 2008
Accepted: Mar 29, 2010
Published online: Apr 7, 2010
Published in print: Oct 2010
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