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Topic: Choked flow

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	Calculating Accidental Release Flow Rates From Pressurized Gas Systems
		The initial instantaneous flow rate from a leak in a pressurized gas system or vessel is much higher than the average flow rate during the overall release period because the pressure and flow rate decrease with time as the system or vessel empties.
		The purpose of this article is to present and explain two published source-term models for calculating the time-dependent decrease in pressure, temperature and weight of gas in a pressurized gas system or vessel during an accidental release.
		Choked flow is also referred to as sonic flow and it occurs when the ratio of the source gas pressure to the downstream ambient atmospheric pressure is equal to or greater than [ (k + 1) / 2 ]
	www.air-dispersion.com /feature2.html (1211 words)

	Differential Pressure Flowmeters
		Flow computing packages are also available that accept the inputs of the d/p transmitter and the other sensors and can simultaneously calculate mass and volumetric flow.
		At the low flow velocities typical of laminar conditions, pitot tubes are not recommended because it is difficult to find the insertion depth corresponding to the average velocity and because the pitot element produces such a small pressure differential.
		Rotameters are inherently self cleaning because, as the fluid flows between the tube wall and the float, it produces a scouring action that tends to prevent the buildup of foreign matter.
	www.omega.com /literature/transactions/volume4/T9904-07-DIFF.html (8957 words)

	Forum Question: Equations for choked flow of gases
		The subject of gas flow through orifices, especially under sonic velocity conditions (i.e., choked flow), is very often raised in engineering discussion forums.
		which means that choked velocity usually occurs when the absolute upstream pressure is at least 1.7 to 1.9 times as high as the absolute downstream pressure.
		It is important to note that although the gas velocity reaches a maximum and becomes choked, the mass flow rate is not choked.
	www.efunda.com /forum/show_message.cfm?start=1&thread=16827&id=16827 (460 words)

	Restriction Devices - Mfg by PRC Flow Measurement and Control Inc. - Tulsa, Ok 800-248-5111
		Restricted or choked flow devices sized and manufactured per customer requirements.
		All PRC Flow Measurement products are designed and manufactured per the applicable standard and or specification.
		Copyright ©2002-2006 PRC Flow Measurement and Control, Inc.
	www.prcflow.com /restriction_devices.htm (70 words)

	SECTION - Online Information article about SECTION
		ball which rising on the surface of the incoming water shuts off the flow when the tank is full.
		Where combined drainage is installed an excess of water poured into the sewers during a storm often results in back flow and the flooding of basements and cellars with sewage.
		Such an occurrence might take place where there is a separate sewer for the storm water, but in this case the flooding would be with comparatively harmless rain-water instead of sewage and filth.
	encyclopedia.jrank.org /SCY_SHA/SECTION.html (3513 words)

	John B. Fenn - Autobiography
		One was that I learned a little bit about the dynamics and thermodynamics of compressible flow, a newly popular area of research spawned by the advent of jet propulsion and sometimes referred to as "Aerothermodynamics", or "Aerothermochemistry" if changes in chemical composition were involved.
		They showed that convective flow of gas through a small orifice from high pressure into vacuum could indeed produce molecular beams with much higher intensities than could the effusive sources introduced and exploited to great advantage by Otto Stern and his colleagues.
		The lower intensities obtained with a diverging nozzle are due to viscosity effects which Kantrowitz and Grey had ignored in their analysis.
	nobelprize.org /chemistry/laureates/2002/fenn-autobio.html (9366 words)

	EXCELLATRONIC COMMUNICATIONS: Cool Websites Archives (Site not responding. Last check: 2007-10-06)
		Any Bug reports, suggestions and ideas on improving the process flow are most welcome.
		The reason I wrote the script for the bourne shell, was there was a working example on the bleb mailing list using the bourne shell, and i was having problems getting a DOS batch file version to work, as whenever wget encountered an ampersand in one of WGet's URL parameters, it choked.
		Theres more info on their TV listings at their website www.bleb.org/tv and also on their developers mailing list.
	steeev.f2o.org /mt/cat_cool_websites.html (2908 words)

	CATHOLIC ENCYCLOPEDIA: The Sacrament of Penance
		And because in hell there is no confession, nor can exomologesis be made there, they who repent with their whole heart and ask for it, should be received into the Church and therein saved unto the Lord" (Ep.
		154) compares the sinner to those whose stomachs are overloaded with undigested food or with excess of humours and phlegm if they vomit, they are relieved, "so, too, those who have sinned, if they conceal and keep the sin within, they are distressed and almost choked by its humour or phlegm.
		But if they accuse themselves and confess, they at the same time vomit the sin and cast off every cause of disease" (Homil.
	www.newadvent.org /cathen/11618c.htm (15709 words)

	Redoubt - Bibliography
		This operating plan provides an overview of multiple agency integrated operations in response to the threat of volcanic ash affecting Alaska, and an agency-by-agency description of roles and responsibilities in such events.
		The early part of the 1989-90 eruption was characterized by explosive emission of substantial volumes of volcanic ash to altitudes greater than 12 kilometers above sea level and widespread flooding of the Drift River valley.
		Morrissey, M. M., and Chouet, B. A., 1997, A numerical investigation of choked flow dynamics and its application to the triggering mechanism of long-period events at Redoubt Volcano, Alaska: Journal of Geophysical Research, v.
	www.avo.alaska.edu /volcanoes/volcbib.php?volcname=Redoubt (7755 words)

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