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Friday, July 24, 2020 | History

2 edition of effect of particle surface roughness on hydraulic flow through granular media found in the catalog.

effect of particle surface roughness on hydraulic flow through granular media

Naama Y. Saied

# effect of particle surface roughness on hydraulic flow through granular media

## by Naama Y. Saied

Written in English

Edition Notes

Ph.D. thesis.

The Physical Object ID Numbers Series Theses Pagination 130p. Number of Pages 130 Open Library OL21483831M

@article{osti_, title = {Surface Roughness Effects on Fluid Transport Through a Natural Rock Fracture}, author = {Crandall, D M and Ahmadi, Goodarz and Smith, D H}, abstractNote = {Fluid flow through rock fractures can be orders of magnitude faster than through the adjacent low-permeability rock. Understanding how fluid moves through these pathways is important for the prediction of. Fluid flow in microchannels or microtubes may differ in terms of wall frictional effects, and hence flow rates, when compared to macrochannels. Focusing on steady laminar fully developed flow of a liquid in different micro-conduits, relative surface roughness is captured in terms of .

The cubic law for fluid flow through a single fracture commonly employed in simulations of fluid flow through a fractured medium assumes the smooth parallel-plate idealization of each fracture. This paper summarizes results of theoretical investigations on the effects of fracture surface roughness on fluid flow through a single deformable fracture.   The particle surface roughness is calculated based on inferences made from surface area data previously obtained for a sample of rocks described in Garga et al. (). The effect of surface roughness on the hydraulic mean radius was found to be greater than that of shape for this sample of crusher-run quarried limestone.

ties of the tracer particles by image analysis of the surface snapshots. Wall roughness Particle wall friction has a major inﬂuence on the bulk behaviour of granular materials. In order to understand the eﬀect of wall friction, we perform experiments with smooth and rough walls. This is . surface roughness and gouge particle characteristics such as shape, roughness, and size affect the frictional strength, Figure 1. Diagram of double direct shear sample config-uration. Granular gouge layers (2–8 mm thick) are driven between roughened or smooth steel blocks. Nominal fric-tional contact area is 10 10 cm2. Normal stress is applied.

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### Effect of particle surface roughness on hydraulic flow through granular media by Naama Y. Saied Download PDF EPUB FB2

Flow and filtration through granular media—the effect of grain and particle size dispersion interception. / D.G. Stevenson Kv is a calculated correction factor for the increased SETTLEMENT roughness of the surface after floc particles have been While interception requires a flow to carry the deposited as illustrated in Fig.

2 Cited by:   Powder flow is governed by various factors including particle size,13, 14, 15 size distribution,13, 16 shape,13, 14, 17, 18 surface roughness,19, 20 and moisture content, 22, 23 Particle size and size distribution not only affects particle flow but were also found to affect tabletability.

24 The effect of particle surface roughness on Cited by: 1. Jensen et al. [44] examined the effect of sample size on the particle breakage behavior within the interface between the granular material and the structure surface using the DEM, and recommended. The effect of increasing roughness on effective hydraulic aperture, Izbash and Forchheimer parameters with increasing Reynolds number (Re) ranging from to was examined.

The growth of complex flow features, such as eddies arising near the fracture surface, was directly associated with changes in surface by: The parameter $$\eta$$ describes the effect of roughness on the flow characteristics in a SRF, and the range of $$\eta$$ value is from 0 to 1.

When $$\eta$$ value equals 0, the decrease in the fracture aperture caused by the roughness element is negligible and the fracture wall can be regarded as a smooth surface. But when $$\eta$$ equals 1, the decrease in the fracture aperture caused. This effect is explained, as the grain size effect, by different particle agitations per unit of flow mass that cause different energy dissipations per unit of travel distance.

When the granular masses have all the same initial compaction before release, in both the laboratory experiments and the numerical simulations, the larger the flow Cited by:   Roughness features on the walls of a channel wall affect the pressure drop of a fluid flowing through that channel.

This roughness effect can be described by (i) flow area constriction and (ii) increase in the wall shear stress. Replotting the Moody’s friction factor chart with the constricted flow diameter results in a simplified plot and yields a single asymptotic value of friction factor.

and roughness of particle surface and the of particle shape on shape dense granular media. Granular liquefaction behavior [9], and particles flow through hopper [10]. The study of flow through media consisting of large-sized grains is important in a number of civil engineering applications.

The particle surface roughness is calculated based on inferences. The study of flow resistance in porous media has a great effect on industrial and agricultural production. The flow resistance of fluid flow through a mm glass sphere bed is studied experimentally.

Microscopically, the liquid creeping flow through the surface roughness of each particle can be described by a local Darcy-like relationship between the surface flux density $$\mathbf{q}$$ and averaged (over some area containing many surface irregularities) pressure in the grooves u (Rye et al.

; Or and Tuller ). Column tests were conducted to investigate media roughness impacts on particle deposition in absence of an energy barrier (i.e., high ionic strength). media/collector surface roughness. The role of hydrodynamic and colloidal interactions in the transport and deposition dynamics of colloidal particles in granular porous media is systematically investigated.

Colloid transport experiments were conducted with three suspensions of positively charged colloidal latex particles (,and nm in diameter) and negatively charged packed quartz grains. If the Hagen Poiseuille equation is applied for the fully developed laminar flow of a On tortuosity and the tortuosity factor in flow and diffusion through porous media (Received 3 March ; accepted for publication 1 September ) Shorter Communications single-phase Newtonian fluid through a typical capillary of hydraulic diameter D5.

Discrete-element method (DEM) simulations of planar wave propagation are used to examine the effect of particle surface roughness on the stiffness and dynamic response of granular materials. A new contact model that considers particle surface roughness is implemented in the DEM simulations.

title = "Surface flow profiles for dry and wet granular materials by Particle Tracking Velocimetry; the effect of wall roughness", abstract = "Two-dimensional Particle Tracking Velocimetry (PTV) is a promising technique to study the behaviour of granular flows.

Thursday 7 August Assessing Hydraulic Conductivity of Soils from Particle Size Data. This edition of the Preene Groundwater Consulting blog discusses methods for assessing hydraulic conductivity of soils from particle size data and highlights some of the potential pitfalls if these values are used in dewatering design and other geotechnical problems.

Synergies of media surface roughness and ionic strength on particle deposition during filtration. Water Research, DOI: / Chao Zeng, Farhang Shadman, Reyes Sierra-Alvarez. Transport and abatement of fluorescent silica nanoparticle (SiO2 NP) in granular filtration: effect of porous media and ionic.

Little is presently known about the effect of pore surface roughness on flow rates through peat. The relationship between soil water content and relative humidity, or water potential, is shown schematically in Fig.

5 for both drying and wetting of a Sphagnum peat. Particle shape and surface Introduction Particle shape is a complex geometric characteristic. It involves the form and habit of the particle as well as features like convexity and surface roughness.

The literature on shape characterization is enormous and. The development of the flow of a granular material down an inclined plane starting from rest is studied as a function of the base roughness. In the simulations, the particles are rough frictional spheres interacting via the Hertz contact law.

The rough base is made of a random configuration of fixed spheres with diameter different from the flowing particles, and the base roughness is decreased.Vegetation reduces the influence of raindrops on surface soil particles and prolongs runoff generation; meanwhile, surface roughness and microtopography affect flow distribution and rill development on a slope [24,25].

Torri et al. () considered the effects of raindrop diameter and runoff depth on the detachment rate model. Two-dimensional Particle Tracking Velocimetry (PTV) is a promising technique to study the behaviour of granular flows. The aim is to experimentally determine the free surface width and position of the shear band from the velocity profile to validate simulations in a split-bottom shear cell geometry.

The position and velocities of scattered tracer particles are tracked as they move with the.