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Encyclopedia > Settling

Settling is the process by which particulates settle to the bottom of a liquid and form a sediment. Also called sediment. Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. ...

Settling velocity or fall velocity or terminal velocity (ws) of a (sediment) particle is the rate at which the sediment settles in still fluid. It is diagnostic of grain size, but is also sensitive to the shape (roundness and sphericity) and density of the grains as well as to the viscosity and density of the fluid. It integrates all of these into a key transport parameter. This article deals with grain size in the context of geology, see crystallite for grain size in materials science. ... The pitch drop experiment at the University of Queensland. ... Density (symbol: Ï - Greek: rho) is a measure of mass per unit of volume. ...

For dilute suspensions, Stokes' Law predicts the settling velocity of small spheres in fluid, either air or water. Stokes' Law finds many applications in the natural sciences, and is given by: Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. ... A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ...

$w=frac{2(rho_p-rho_f)gr^2}{9mu}$

where w is the settling velocity, ρ is density (the subscripts p and f indicate particle and fluid respectively), g is the acceleration due to gravity, r is the radius of the particle and μ is the dynamic viscosity of the fluid.

Stokes' law applies when the Reynolds number is less than 0.1. The Reynolds number is the ratio of inertial forces (vsÏ) to viscous forces (Î¼/L) and is used for determining whether a flow will be laminar or turbulent. ...

Settleable solids are the particulates that settle out of a still fluid. Settleable solids can be quantified for a suspension using an Imhoff cone. Flour suspended in water In chemistry, a suspension is a colloidal dispersion (mixture) in which a finely-divided species is combined with another species, with the former being so finely divided and mixed that it doesnt rapidly settle out. ...

Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. ... A settling basin or settling pond is a method of removing very fine particles from water by means of gravity. ... Total suspended solids is a water quality measurement usually abbreviated TSS. This parameter was at one time called non-filterable residue (NFR), a term that refers to the identical measurement: the dry-weight of particles trapped by a filter, typically of a specified pore size. ...

Results from FactBites:

 Settling - Wikipedia, the free encyclopedia (228 words) Settling is the process by which particulates settle to the bottom of a liquid and form a sediment. Settling velocity or fall velocity or terminal velocity (ws) of a (sediment) particle is the rate at which the sediment settles in still fluid. where w is the settling velocity, ρ is density (the subscripts p and f indicate particle and fluid respectively), g is the acceleration due to gravity, r is the radius of the particle and μ is the dynamic viscosity of the fluid.
 settling - definition of settling in Encyclopedia (202 words) Settling is sediment that has settled at the bottom of a liquid. Stoke's Law predicts the settling velocity of a small sphere in a fluid. where w is the settling velocity, ρ is density (the subscripts p and f indicate particle and fluid respectively), g is the acceleration due to gravity, r is the radius of the particle and μ is the dynamic viscosity of the fluid.
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