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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
4, a, at a backpressure of 30 kPa, the fuel cell having the bipolar flow field M2 entered rapidly in the concentration loss region, starting with a current density of only 0.7 A/[cm.sup.2].
Astute readers will rightly point out that an adjustable gas block aptly controls peak backpressure; however, adjustable gas blocks cannot reduce the duration of backpressure.
To address the above problem, we propose a new efficient backpressure scheduling algorithm for heterogeneous multi-hop wireless networks.
To keep the backpressure as low as possible, BASF experts have developed innovative production and coating technologies.
Suspended enzyme is then injected onto the HPLC/UHPLC column, where it can precipitate on the head of the column, resulting in a rapid decrease in column lifetime and an increase in backpressure.
This in turns puts great backpressure on the pumps.
From (4), the relationship between [Q.sub.[mu]] and ([p.sup.2.sub.1] - [p.sup.2.sub.2])/L is a straight line with increasing backpressure. ([p.sup.1] - [p.sup.2]) is composed of two items.
Emerson Process Management has expanded its overpressure protection offering with additional sizes for the EZH, EZR and FL series relief valve and backpressure regulators.
It provides diesel particulate filter regeneration under any conditions with reduced fuel penalty and improved backpressure engine performance, especially with cold-duty cycles in city traffic.
Thermal Regeneration Unit for Exhaust -T.R.U.E.-Clean(R), Tenneco's T.R.U.E.-Clean system provides diesel particulate filter regeneration under any conditions with reduced fuel penalty and improved backpressure engine performance, especially with cold-duty cycles in city traffic.