Interaction of Particles and Near-Wall Lift in Slurry Pipelines

Wilson, Kenneth; Sellgren, Anders

doi:10.1061/(asce)0733-9429(2003)129:1(73)

Cited by 34 publications

(17 citation statements)

References 5 publications

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“…The relevance of the fairly simple model described in the article, is that it shows that one does not necessarily need to follow the lift-force model stipulated out by Wilson and Sellgren (2003). As will be shown, the first step is to look at boundary layer flow and next these lift forces and other processes should be quantified.…”

Section: Introductionmentioning

confidence: 98%

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Analytical Model for Pipe Wall Friction of Pseudo-Homogenous Sand Slurries

Talmon

2013

Particulate Science and Technology

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In pseudo-homogenous pipeline flow of sand-water mixtures the measured hydraulic resistance is higher than for the flow of water, but is less than for a liquid having the same density as the mixture but a viscosity equal to that of water. A new analytical model is devised for pipe wall friction in which there is a watery viscous sublayer along the pipe wall. It is assumed that the presence of solids does not affect the viscous properties of the mixture, and that grain-stresses are negligible. A satisfying result is obtained in a particle range of 0.1 to 2 mm median grain diameter and volumetric concentrations up to about 30%. It is found that the model describes a lower bound for hydraulic resistance. The theoretical concept can be used as a basis for further developments into the heterogeneous regime, where additional physical processes come into play.

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Section: Introductionmentioning

confidence: 98%

“…This could originate from de-mixing forces in the shear flow along the wall (see Wilson et al 2000;Wilson and Sellgren 2003;Matousek 2009). Wilson and coauthors concluded that within a particle diameter range of 0.08 to 0.4 mm, there is a hydrodynamic lift force driving the particles away from the wall.…”

Section: Introductionmentioning

confidence: 99%

Analytical Model for Pipe Wall Friction of Pseudo-Homogenous Sand Slurries

Talmon

2013

Particulate Science and Technology

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“…Actually, the origin of this force, which increases with the delivered solid volume fraction, is still rather obscure. Wilson and Sellgren [17] attribute it to the interaction between a solid particle and liquid flow of the steep velocity gradient, which causes its rotation and develops a pressure differential over the particles. They developed a model for this force, later revised by Wilson et al [8], and reported that, for sand-water slurries, the hydrodynamic lift force is not effective for particles smaller than about 150 μm and larger than about 400 μm.…”

Section: Introductionmentioning

confidence: 99%

Improvements in the numerical prediction of fully-suspended slurry flow in horizontal pipes

Messa

Malavasi

2015

Powder Technology

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“…Recently, several works discussed the problem of particle-liquid interaction in the turbulent flow core (Campbell et al 2004) or in the near-wall region (Wilson & Sellgren 2003;Righetti & Romano 2004;Kaushal & Tomita 2007) of horizontal flows of settling slurries. Perhaps the most detailed analysis of particle-liquid interaction effects resulting in migration of particles from a flow boundary due to the hydrodynamic lift force acting on solid particles interacting with liquid flow in the boundary layer of a flow has been delivered by Wilson and Sellgren (2003). They used the general Kutta-Zhukovski equation for lift acting on a solid body in flowing fluid as a basis for the description of the inertia lift force acting on a solid particle traveling in the near-wall region of the conduit flow.…”

Section: Theory Of Hydrodynamic Liftmentioning

confidence: 99%

“…The Wilson-Sellgren concept (Wilson & Sellgren 2003) relates the lift force with the liquid velocity profile through the parameter n…”

Section: Hydrodynamic Off-the-wall Liftmentioning

confidence: 99%

Pipe-Wall Friction in Vertical Sand-Slurry Flows

Matoušek¹

2009

Particulate Science and Technology

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This article describes the results of extensive laboratory tests of vertical flows of three sand fractions (0.12, 0.37, and 1.84 mm sands) in a 150 mm pipe. The tests revealed an interesting phenomenon of a surprisingly low contribution of the medium sand to the total friction of the mixture flow in the vertical pipe. The frictional pressure drop in highly concentrated flows at high velocities was lower for slurries of the medium sand than for slurries of both the fine sand and the coarse sand. The solids friction at the pipe wall is analyzed taking into account effects of particle-particle interactions and particle-liquid interactions in the boundary layer of a vertical flow of settling slurry. The analysis suggests that the observed phenomenon is associated with the hydrodynamic liquid lift force acting on solid particles traveling near a pipe wall. This off-wall force seems to be more effective for the medium sand particles than for the fine sand particles and coarse sand particles interacting with liquid in the boundary layer of the mixture flow. The excessive frictional pressure drop due to the presence of solids in vertical flows seems to be primarily produced by the combined effect of the Bagnold collisional force (the force that colliding particles exert against the pipe wall) and the liquid lift force acting on solid particles in the near-wall zone of the slurry flow.

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Interaction of Particles and Near-Wall Lift in Slurry Pipelines

Cited by 34 publications

References 5 publications

Analytical Model for Pipe Wall Friction of Pseudo-Homogenous Sand Slurries

Analytical Model for Pipe Wall Friction of Pseudo-Homogenous Sand Slurries

Improvements in the numerical prediction of fully-suspended slurry flow in horizontal pipes

Pipe-Wall Friction in Vertical Sand-Slurry Flows

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