Ram pressure stripping in NGC 4402 as it falls towards the Virgo Supercluster (off image, toward bottom left). Note the dust (brown) trailing behind (toward upper right) the galaxy, versus the dust-free (blue-white) leading edge.
Ram pressure is a pressure exerted on a body moving through a fluid medium, caused by relative bulk motion of the fluid rather than random thermal motion.[1] It causes a drag force to be exerted on the body. Ram pressure is given in tensor form as
,
where is the density of the fluid; is the momentum flux per second in the direction through a surface with normal in the direction. are the components of the fluid velocity in these directions. The total Cauchy stress tensor is the sum of this ram pressure and the isotropic thermal pressure (in the absence of viscosity).
In the simple case when the relative velocity is normal to the surface, and momentum is fully transferred to the object, the ram pressure becomes
.
^Clarke, Cathie; Carswell, Bob (2007). Principles of astrophysical fluid dynamics. Cambridge University Press. p. 18. ISBN 978-0521853316.
Rampressure is a pressure exerted on a body moving through a fluid medium, caused by relative bulk motion of the fluid rather than random thermal motion...
Ram air refers to the principle of using the airflow created by a moving object to increase ambient pressure, known as rampressure. Often, the purpose...
hydraulic ram pump, ram pump, or hydram is a cyclic water pump powered by hydropower. It takes in water at one "hydraulic head" (pressure) and flow rate...
used as a power source. The RAT generates power from the airstream by rampressure due to the speed of the aircraft. It may be called an air driven generator...
"dynamic" or "ram" pressure because it results from fluid motion. In our airplane example, the stagnation pressure would be atmospheric pressure plus the dynamic...
at which the engine pressure ratio (epr) has fallen to one. The turbo afterburner then acts as a ramburner. The intake rampressure is present at entry...
mechanism, or on the outside by rampressure or hydrostatic pressure. Flow rate through the intake depends on pressure difference, fluid properties, and...
in the original turbojet and newer turbofan, or arise solely from the rampressure of the vehicle's velocity, as with the ramjet and pulsejet. All practical...
: 445 Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure. Various units are used to express pressure. Some of these...
gas in a similar direction as the rampressure stripped gas in NGC 4302 suggest that NGC 4298 is undergoing rampressure. List of NGC objects (4001–5000)...
a type of galaxy found in galaxy clusters. They are characterised by rampressure stripping of gas from the affected galaxy by the intracluster medium...
efficiency (the engine efficiency is increased by the rampressure rise which adds to the compressor pressure rise, the higher aircraft speed approaches the...
inlet duct is extremely efficient and is used where there is little rampressure available to force the air into the engine. Bell-mouth ducts are used...
ram air pressure from the pitot tube, or stagnation pressure, and the static pressure. The pitot tube is mounted facing forward; the static pressure is...
Aaya Ram Gaya Ram (lit. 'Ram has come, Ram has gone') is a Hindi expression referring to the practice of turncoating, or switching parties in the context...
some gas and interstellar dust from the spiral. It is also suffering ram-pressure stripping as it moves at high speed through Virgo's intracluster medium...
the constellation Virgo. NGC 4522 is losing its molecular gas though ram-pressure stripping as it plows though the cluster at a speed of more than 10 million...
to the cluster where gas is stripped from the galaxy by the action of rampressure. A radio continuum tail can seen extending outwards from the galaxy,...
Telescope Observations of the Coma Galaxy D100 and Star Formation in Its RamPressure–stripped Tail". The Astrophysical Journal. 870 (2): 2. arXiv:1811.04916...
wind exerts a pressure typically in the range of 1–6 nPa ((1–6)×10−9 N/m2), although it can readily vary outside that range. The rampressure is a function...
The Ram pickup (marketed as the Dodge Ram until 2010) is a full-size pickup truck manufactured by Stellantis North America (formerly Chrysler Group LLC...
known as "rampressure fireballs". These fireballs are actively forming stars. After forming, the stars are no longer subjected to a rampressure force,...
megaparsec, from the cluster center at Messier 87. The galaxy is undergoing ram-pressure stripping of much of its interstellar medium as it moves through the...
Blue blobs are also sometimes known as RamPressure Dwarfs, due to their formation likely being due to ram-pressure stripping of gas from nearby galaxies...
through the intergalactic medium of its cluster is creating, as expected, rampressure that is stripping away the outer region of neutral hydrogen. To date...
called rampressure stripping, and other galaxies with tidal tails and star forming stellar streams associated with collisions and mergers. Rampressure stripping...
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