baffle

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baffle

a plate or mechanical device designed to restrain or regulate the flow of a fluid, the emission of light or sound, or the distribution of sound, esp in a loudspeaker or microphone
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Baffle

An opaque or translucent element used to diffuse or shield a surface from direct or unwanted light.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Baffle

 

an installation in the afterbay of an overflow dam that changes the direction of the flow and spreads the width of the water stream when only some of the spillway apertures in the dam are functioning. The basic purpose of a baffle is to ensure a fairly uniform distribution of the flow velocities and to reduce them on the downstream apron. A distinction is made between a ramp baffle (continuous or slotted), which is installed along the entire width of the water apron, and a baffle formed of piers, which is placed at an angle to the water stream.

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

baffle

[′baf·əl]
(electricity)
Device for deflecting oil or gas in a circuit breaker.
(electronics)
An auxiliary member in a gas tube used, for example, to control the flow of mercury particles or deionize the mercury following conduction.
(engineering)
A plate that regulates the flow of a fluid, as in a steam-boiler flue or a gasoline muffler.
(engineering acoustics)
A cabinet or partition used with a loudspeaker to reduce interaction between sound waves produced simultaneously by the two surfaces of the diaphragm.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

baffle

1. A plate used to control the flow of a liquid.
2. An opaque or translucent plate used to shield a light source from direct view at certain angles; a light baffle.
3. A flat deflector or obstruction designed to reduce sound transmission.
4. A plate that retards and/or changes the direction of the flow of air, air-gas mixtures, or flue gases.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

baffle

baffle
A fuel tank with baffle plates.
baffleclick for a larger image
baffleclick for a larger image
baffle
i. A series of partitions in a fuel tank to control the rapid flow of fuel and prevent its sloshing. These partitions have holes that allow the fuel to feed to the tank outlet, but they keep the fuel from surging enough to uncover the fuel outlet.
ii. A partition separating the upper portion of the tank that prevents oil pump cavitation as oil tends to rush to the top of the tank during deceleration periods. The baffle is fitted with a weighted swirl outlet control valve that is free to swing below the baffle. The valve closes when oil at the bottom of the tank rushes up when the aircraft decelerates.
iii. A sheet metal shield used to direct the flow of air between and around the cylinders of an air-cooled reciprocating engine.
iv. A partial partition in the pitot system to trap moisture and any solid matter as well as to reduce turbulence.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Numerical simulation of turbulent flow in a baffled stirred tank with an explicit algebraic stress model, Chemical Engineering Science 69: 30-44.
Third, the mechanisms for the fully baffled configuration are shown for varying submergences and impeller geometries using experimental observations and confirmatory CFD experiments.
Normally, with a baffled vessel, the level of agitation can be controlled by how fast the impeller is turned.
Summary: Islamabad [Pakistan], Feb 28 (ANI): Pakistan Tehreek-e-Insaf (PTI) Chairman Imran Khan on Wednesday said that he is baffled by the National Accountability Bureau (NAB) not taking action against Foreign Minister Khawaja Asif despite having been provided with ample evidence of his misdoings.
THE fast-changing world of text talk has left parents so baffled, it is enough to make teenagers LOL.
The construction of baffled channels in water treatment plants with no mechanical parts is considered to be more reliable, requires less maintenance and hence reduces cost [27].
Wilfried and Deiying [4] analyzed the influence of baffle/shell leakage flow on the thermal performance in baffled shell-and-tube heat exchangers with different distances between baffles is studied experimentally.
Summary: Experts are baffled by a giant eye which washed up on a beach in Florida.
Many studies involving solid-liquid agitation have focused on a range of system geometries involving fully baffled cylindrical tanks with either dished or flat bottoms; however, there are some industries and applications, such as waste water treatment and flue gas desulphurization, in which square tanks have been, and continue to be, used due to their ease of construction and lower cost for large tanks.
CAPTAIN John Terry admitted to being "baffled" at Frank Lampard becoming the scapegoat for England fans, hailing the impact his Chelsea team-mate has made for his country over the past few years.
Boycott call is 'baffling' ENGLAND all-rounder Paul Collingwood is "surprised and baffled" by a call from ex-captain Geoffrey Boycott for coach Duncan Fletcher to stand down.
Bush was baffled, so he typed it out and e-mailed it to Colin Powell.