back pressure


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back pressure

[′bak ‚presh·ər]
(mechanics)
Pressure due to a force that is operating in a direction opposite to that being considered, such as that of a fluid flow.
(mechanical engineering)
Resistance transferred from rock into the drill stem when the bit is being fed at a faster rate than the bit can cut.

Back Pressure

 

the pressure of steam or gas at the end of the expansion process in a heat engine, such as a steam or gas turbine or a steam engine. The term “back pressure” is used to define the final pressure that exists when the expansion does not terminate in the condensation of the steam. In a steam turbine with back pressure, the exhaust steam is not condensed and, instead, is used as a source of heat for either an industrial process or another turbine.

back pressure

Pressure developed in opposition to the flow of liquid or gas in a pipe, duct, conduit, etc.; due to friction, gravity, or some other restriction to flow of the conveyed fluid.

back pressure

A pressure exerted backward; in a field of fluid flow, a pressure exerted contrary to the pressure producing the main flow. Specifically, the pressure inside the exhaust system of a reciprocating engine that prevents the flow of burned gases from the cylinders.
References in periodicals archive ?
There is another issue, when the back pressure during the flare is too much, the natural tendency is to put both hands on the yoke--the "two-handed landing.
We have observed multiple students holding the conception that the structural difference between the left and right ventricles is related to the length of the respective vascular circuits, instead of the back pressure exerted by each circuit.
With monolithic columns, organic solvents with higher viscosity, such as methanol, isopropyl alcohol and ethanol, can be used without worrying about high back pressures.
This allows the potential energy from the hydraulic back pressure to drive a reaction turbine, which, in turn, can assist in driving the main distribution pumps.
The plasticator was running at 235(degrees)C for all four barrel zones, a screw speed of 99 rpm, and with a back pressure of 2.
The RPZ design features triple security to provide optimum protection against back pressure and back siphonage: two check valves and a discharge valve divide the unit into three chambers, each providing a separate pressure zone.
In all these previous studies, back pressure effects on melt temperature were not modeled and the SISO models did not include the effect of zone interaction.
The problem: Pumps--particularly the high-head models mostly used in the pool business--need a certain amount of back pressure.
The system provides continuous monitoring functions that include system stares indicator lights on its control panel and an integrated exhaust back pressure monitor.
Additionally, the effectiveness of the spray system (code named "Water Mach" by the Aum Shinrikyo) was questionable; it apparently broke down repeatedly, and hydrostatic back pressure caused the suspension to leak from tubing used to transport it up eight stories.
Proprietary "Best Flow" automatic instrument detection increases accuracy by adjusting for back pressure created by smaller scopes.
The design provides increased air performance and higher back pressure in a 40 mm fan size.