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Suction is the day-to-day term for the movement of gases or liquids along a pressure gradient with the implication that the movement occurs because the lower pressure pulls the gas or liquid. However, the forces acting in this case do not originate from just the lower pressure side, but also from the side of the higher pressure, as a reaction ...
A transparent suction cup The pressure on a suction cup, as exerted by collisions of gas molecules, holds the suction cup in contact with the surface. One cup suction lifter. A suction cup, also known as a sucker, is a device or object that uses the negative fluid pressure of air or water to adhere to nonporous surfaces, creating a partial ...
Suction is the vertical distance between the fluid to be pumped and the centre of the pump, while lift is the vertical distance between the pump and the delivery point. [4] The depth from which a hand pump will suck is limited by atmospheric pressure to an operating depth of less than 7 meters. [ 5 ]
Potain's aspirator. A medical aspirator is a suction machine used to remove mucus, blood, and other bodily fluids from a patient.They can be used during surgical procedures but an operating theater is generally equipped with a central system of vacuum tubes. [1]
In surgery suction can be used to remove blood from the area being operated on to allow surgeons to view and work on the area. Suction may also be used to remove blood that has built up within the skull after an intracranial hemorrhage. [2] Suction devices may be mechanical hand pumps or battery or electrically operated mechanisms.
In a hydraulic circuit, net positive suction head (NPSH) may refer to one of two quantities in the analysis of cavitation: The Available NPSH (NPSH A): a measure of how close the fluid at a given point is to flashing, and so to cavitation. Technically it is the absolute pressure head minus the vapour pressure of the liquid.
In fluid dynamics, a synthetic jet flow—is a type of jet flow, which is made up of the surrounding fluid. [1] Synthetic jets are produced by periodic ejection and suction of fluid from an opening. This oscillatory motion may be driven by a piston or diaphragm inside a cavity among other ways. [2] [3] [4]
External suction (previously referred to as active suction) is used to create a sub-atmospheric pressure at the tip of a catheter.As the atmospheric pressure is lower compared to the intrapleural pressure, the lack of external suction (which was previously referred to as passive suction) is used to drain air and fluids. [1]