In fluid mechanics, displacement occurs when an object is immersed in a fluid, pushing it out of the way and taking its place.
An object which sinks completely displaces an amount equal to its volume; Archimedes' Principle states that when this happens, the weight of the object is reduced by its volume times the density of the fluid. If the weight of the object is less than this quantity, it will float; the amount of fluid displaced is directly related (via Archimedes' Principle) to its weight.
This is widely used in describing ships. The displacement of a vessel is defined as the weight of the amount of water it displaces when afloat. A ship's size is reported as the number of long tons of water it displaces; see dead weight tonnage. A variation of this meaning is a measure of shipping capacity.
Also, a displacement hull pushes its way through water, being supported entirely by displacement, as opposed to a hydroplaning hull, which glides over the surface of the water while being partially supported by hydrodynamic forces caused by the motion of the hull across the water, or a hydrofoil, which lifts the hull from the water entirely, using underwaterwings.
This is accomplished by pumping a spacer fluid that is benign to both the first and second fluid, followed by the new fluid, down the drillstring and out the bottom of the drillstring or bit.
While the spacer and second fluid are pumped into the top of the wellbore, the first fluid is forced out of the annulus between the drillstring and the wellbore or casing.
Cement displacement is similar to definition 2 above, with the noted exception that the cement slurry would not normally be pumped out the top of the annulus, but would instead be placed in a particular location in the annulus.
The displacementfluid machine according to claim 1, wherein one of said end plates is formed integrally on a main-bearing and another of said end plates is formed integrally on a sub-bearing.
The displacementfluid machine according to claim 3, wherein one of said end plates is formed integrally on a main-bearing and another of said end plates is formed integrally on a sub-bearing.
The displacementfluid machine according to claim 5, wherein one of said end plates is formed integrally on a main-bearing and another of said end plates is formed integrally on a sub-bearing.
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