Principles governing the viscous flow of suspensoid sols

Starkey, T V; Hewlett, V A; Roberts, J. H.; James, R. E.

doi:10.1088/0508-3443/12/10/307

Cited by 13 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, pipe wear from abrasive materials may override both physical and economic factors (10, 49). Many attempts have been made to penetrate the theory of suspensions (9,27,32,45,47,48) but as a science, slurry transport is still largely in the empirical stage. Designing such a line is clearly a job for the specialist.…”

Section: Principlesmentioning

confidence: 99%

See 1 more Smart Citation

Transporting Solids by Pipeline—slurries

Ellis¹,

Redberger²,

Bolt³

1963

Ind. Eng. Chem.

View full text Add to dashboard Cite

show abstract

Section: Principlesmentioning

confidence: 99%

“…Examples of materials which can be made into nonsettling slurries are finely crushed limestone and clay, colloidal clays, or finely crushed coal, especially when the coal is transported in oil. Further information about nonsettling slurries has been published (7, 16,43,45).…”

Section: Principlesmentioning

confidence: 99%

Transporting Solids by Pipeline—slurries

Ellis¹,

Redberger²,

Bolt³

1963

Ind. Eng. Chem.

View full text Add to dashboard Cite

show abstract

Particle migration in shear fields

1966

View full text Add to dashboard Cite

The motion of a single rigid sphere entrained in a glycerine-water solution flowing downward through a cylindrical tube has been investigated throughout a range of particle Reynolds numbers of 6.0 to 120.0, tube Reynolds numbers of 208 to 890, and particle-to-tube diameter ratios of 0.120 to 0.190. Trajectories of the sphere, calculated for various particle Reynolds numbers by using the Rubinow-Keller expression for the transverse force, were found to agree satisfactorily with experimentally determined trajectories when the particle Reynolds number was below 40.0. In all cases the sphere was observed to migrate to the axis of the tube. At the lower particle Reynolds numbers the sphere approached the axis asymptotically, whereos a t the higher particle Reynolds numbers the sphere oscillated across the axis of the tube one or more times during migration. All observations were made with spheres which were less dense than the fluid, the density difference being as high as 10% of the fluid density.Particle migration in a shear field refers to that phenomenon in which particles entrained in a flowing fluid move across fluid streamlines as a consequence of fluid dpamic forces. In systems where numerous particles are entrained in the fluid this phenomenon is frequently referred to as the tubular pinch effect or sigma effect (20).the' transport of solid particles by fluids through pipeline3 and the determination of suspension viscosity by the capillary tube technique (6, 13, 23 to 25) are examples where this effect is known to occur. Although the majority of the processes where migration is an important factor involve multiparticle suspensions, research on single particle systems is a logical place to start toward gaining a better understandin of the more complicated systems reconcerned with migration of a single rigid sphere entrained in a straight tube of circular cross section.All of the previous research on particle migration ( 5 , 9, 10, 12, 15, 16, 21, 27) have been conducted within a particle Reynolds number range where fluid inertia effects were small and, with two exceptions (9, 16), under circumstances where the particle and fluid were closely matched in density. While all reported theoretical solutions to this problem (1, 2, 1 7 to 19) have shown that no transverse force results unless the inertial terms are retained in the Navier-Stokes equations, none of these solutions-by virtue of the techniques used to obtain the solutions-have considered inertial effects where these effects were quite large.Because the effect of fluid inertia on a sphere entrained in a Poiseuille flow field had not been previously studied ferred to above. T f e research reported in this paper is C. D. Denson is with General Electric Research and DevelopmentCenter, Schenectady, New York. in a systematic manner. an investigation was initiated to study migration in a particle Reynolds number range where the fluid inertia effects would be larger than in previous studies; the results of this work are summarized in this paper. In this investiga...

show abstract

The pipeline flow of coal‐in‐oil suspensions

1963

View full text Add to dashboard Cite

The flow behavior of coal‐in‐oil suspensions at velocities up to ca. 20 ft./sec. has been investigated in a one‐inch d. experimental pipeline. Detailed data are presented for a bituminous and a subbituminous coal (effective size < 700 microns) entrained in two oils (μ = 5.6 and 46.7 ep. at 25°C. respectively); coal concentrations in the suspensions ranged > 70% w/w. At flow velocities greater than 2 ft./sec. and coal concentrations below 50% w/w, the suspensions were found to move as relatively homogeneous (or quasi‐homogeneous) fluids, and pressure gradients followed the usual friction factor/Reynolds number relationship. But no satisfactory correlations could be established for flow at < 2 ft./sec., which is influenced by significant settling, or for the behavior of suspensions containing > 50% w/w coal. In the latter case, laminar flow obtained at all velocities and the suspended particles tended to concentrate near the pipe axis (and to move along it as a definite ‘core'’. One effect of this phenomenon is a substantial reduction in the apparent viscosity of the suspension.

show abstract

Principles governing the viscous flow of suspensoid sols

Cited by 13 publications

References 8 publications

Transporting Solids by Pipeline—slurries

Transporting Solids by Pipeline—slurries

Particle migration in shear fields

The pipeline flow of coal‐in‐oil suspensions

Contact Info

Product

Resources

About