> Excess Hydraulic Gradient

The Excess Hydraulic Gradient Ehg is the difference between the mixture gradient im and the liquid gradient il.

i=Δp/(ρl·g·ΔL), il=Δpl/(ρl·g·ΔL), im=Δpm/(ρl·g·ΔL)

Ehg=(im-il).

This Excess Hydraulic Gradient Ehg shows the so called solids effect, the contribution of the solids to the total hydraulic gradient.

The Relative Excess Hydraulic Gradient Erhg is the Excess Hydraulic Gradient Ehg divided by the Relative Submerged Density Rsd=(ρsl)/ρl and divided by the Spatial Volumetric Concentration Cvs or the Transport (Delivered) Volumetric Concentration Cvt.

Erhg=Ehg/(Rsd·Cvs)=(im-il)/(Rsd·Cvs).

The Relative Excess Hydraulic Gradient Erhg shows the so called solids effect, but relative to the volumetric concentration and the relative submerged density.

The advantage of using the Relative Excess Hydraulic Gradient Erhg is, that this parameter is almost independent of the volumetric concentration and the relative submerged density.



   The Excess Hydraulic Gradient

  Constant Spatial Volumetric Concentration

Constant Delivered Volumetric Concentration




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