Effect of shape on incipient motion of large solitary particles

2005-01-01
The aim of this study is to investigate the effect of shape and size of solid particles on their initiation of motion in open channel flows. Initial motions of 22 solitary particles having different shapes and sizes were observed in a tilting flume of rectangular cross section. A smooth fixed bed and an obstructing element of smaller height with respect to the particle size was used throughout the experiments. The ratio of the height of the obstructing element to the height of the particle was kept constant at 1/5. By either changing the slope of the tilting flume or the discharge, or both, a range of shear stress values was obtained. Various equations and graphical representations in terms of dimensionless bed shear stress, grain Reynolds number, and the ratio of flow depth to grain diameter were presented to determine the flow conditions corresponding to the initiation of motion of solitary particles of given shapes. The experiments have revealed that critical flow conditions are dependent not only on the particle size and shape but also on the ratio of flow depth to grain diameter.
JOURNAL OF HYDRAULIC ENGINEERING-ASCE

Suggestions

Effect of meteorology and transport on particle concentrations and size distribution in Eastern Mediterranean atmosphere
Uzunpınar, Elif Sena; Tuncel, Süleyman Gürdal; İmamoğlu, İpek; Department of Environmental Engineering (2022-3-25)
This study aims to examine the relationship between particle sizes and processes in the atmosphere and the effect of dust transport on particle size distribution. Number (0.2 μm to 32 μm) and mass (PM1, PM2.5, and PM10) concentrations were collected at rural (Mediterranean coast - Marmaris) and suburban (Central Anatolia - Ankara) stations between April 1, 2017, and October 31, 2018. The coarse particles were more dominant in the Ankara while the Marmaris contained relatively smaller-sized particles. The lo...
Effect of the high frequency components of near-fault ground motions on the response of linear and nonlinear SDOF systems: A moving average filtering approach
Yalcin, O. Fatih; Dicleli, Murat (Elsevier BV, 2020-02-01)
In this study, the effect of the high frequency components of near fault ground motions (NFGM) with forward rupture directivity effect (FRDE) on the seismic response of elastic and inelastic SDOF regular (non-isolated) and seismic isolated structures is studied. For this purpose, Moving Average filtering method is used to remove the high frequency content of the NFGM at various filtering levels. The key motive for this effort is to evaluate the appropriateness of representing the NFGMs by decomposed signals...
Formation of air-entraining vortices at horizontal intakes without approach flow induced circulation
Göğüş, Mustafa; Köken, Mete (2016-02-01)
The aim of this experimental study is to investigate the effects of hydraulic parameters on the formation of air-entraining vortices at horizontal intake structures without approach flow induced circulation. Six intake pipes of different diameters were tested in the study. The intake pipe to be tested was horizontally mounted to the front side of a large reservoir and then for a wide range of discharges experiments were conducted and critical submergences were detected with adjustable approach channel sidew...
Effect of High Hydrostatic Pressure (HHP) Treatment on Physicochemical Properties of Horse Mackerel (Trachurus trachurus)
ERKAN ÖZDEN, Nuray; Uretener, Gonca; Alpas, Hami; Selcuk, Arif; Ozden, Ozkan; Buzrul, Sencer (2011-10-01)
The basic objective of this study was to determine the effect of high hydrostatic pressure (HHP; 220, 250 and 330 MPa), holding time (5 and 10 min) and temperature (7, 15 and 25 A degrees C) on some quality parameters of horse mackerel such as colour changes, thiobarbituric acid (TBA-i) and trimethylamine nitrogen (TMA-N), free amino acid content. HHP increased L (*) values of horse mackerel. The a (*) and b (*) of treated horse mackerel did not change significantly after HHP applications. After, HHP, TBA-i...
Effect of Flare Geometry on the Flow Field of Radial-Radial Swirlers
Bay, Ayse; Kiyici, Firat; Perçin, Mustafa (2022-01-01)
In this study, an experimental investigation is conducted to assess the impact of the flare geometry on the mean flow field generated by radial-radial swirlers. Two-dimensional two component PIV measurements are performed on the mid-plane of a non-reacting planar combustor test section. Three dimensional numerical simulations are conducted for selected cases to support experimental observations. In a previous study conducted in the same setup, counter-rotating radial-radial swirlers without flare extension ...
Citation Formats
M. Göğüş, “Effect of shape on incipient motion of large solitary particles,” JOURNAL OF HYDRAULIC ENGINEERING-ASCE, pp. 38–45, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31296.