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Topic: Vortex tube

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	Vortex Tube, Vortex Tubes use compressed air for spot cooling
		Vortex Tubes are available in a wide range of sizes to meet the needs of many process and spot cooling applications.
		In a free vortex (like a whirlpool) the angular velocity of a fluid particle increases as it moves toward the Center of the vortex-that is, the closer a particle of fluid is to the center of a vortex, the faster it rotates.
		In a forced vortex, the velocity is directly, proportional to the radius of the vortex-the closer the center, the slower the velocity.
	www.newmantools.com /vortex.htm (2045 words)

	Vortex Tubes Stainless Steel - Frigid-X
		Vortex Tubes have an adjustable valve at the "hot" end controls the volume of the air flow, and the temperature exiting at the cold end.
		Vortex Tubes - Frigid-X™ are constructed of stainless steel and use a generator and valve made of brass and sealed with viton o-rings to allow their use in the widest range of environments.
		The percentage of total input air to the vortex tube that is directed to the cold end is the "cold fraction".
	www.nex-flow.com /vortex_tube.htm (582 words)

	dk
		However in a vortex tube the speed of the inner vortex remains the same as that of the outer vortex.
		The first tube is believed to have been constructed on too large of a scale and the compressed air supply was not powerful enough to force the air from the second vortex down the low-pressure area of the first.
		Within the vortex tube we extend this and say that pressure is also related to the number of objects in a mole of the gas in the tube.
	www.ocf.berkeley.edu /~dlk/tangents/vortex/vortex_public.php (4351 words)

	Vortex Power Station
		The physical tube of the solar chimney is replaced with a vortex and the atmospheric boundary layer acts as the solar collector.
		The vortex, which was 1 to 5 cm in diameter was stable and visible to a height of 1 m because of the colour of the flame and smoke.
		A vortex behaves like a dynamic pipe; a vortex in cyclostropic balance permits little or no radial flow into its core because the radial pressure gradient force is in stable equilibrium with centrifugal force; the cyclostropic balance is upset in the surface layer because friction reduces the tangential wind and centrifugal force [11].
	www.vortexengine.ca /VPS/VPS_ARTICLE.htm (3692 words)

	THE HILSCH VORTEX TUBE (Site not responding. Last check: 2007-11-02)
		Three factors determine the performance of the Hilsch tube; the setting of the stopcock, the pressure at which air is admitted to the nozzle, and the size of the hole in the washer.
		Molecules of air at the outside of the vortex are slowed by friction with the wall of the spiral.
		In the case of the Hilsch tube the action of centrifugal force compresses the hot rim of gas into a compact mass which can escape only by flowing along the inner wall of the "hot" pipe in a compressed state, because its flow into the cold tube is blocked by the rim of the washer.
	www.visi.com /~darus/hilsch (1667 words)

	Vortex Tube Theory (Site not responding. Last check: 2007-11-02)
		A vortex tube uses compressed air as a power source, has no moving parts, and produces hot air from one end and cold air from the other.
		Compressed air is supplied to the vortex tube and passes through nozzles that are tangent to an internal counterbore.
		However, because of the principle of conservation of angular momentum, the rotational speed of the smaller vortex might be expected to increase.
	www.exair.com /vortextube/vt_theory.htm (558 words)

	Vortex tube - Wikipedia, the free encyclopedia
		The vortex tube, also known as the Ranque-Hilsch vortex tube, is a mechanical device that separates gas into hot and cold streams.
		The vortex tube was invented in 1933 by French physicist Georges J. Ranque.
		A discussion of the vortex tube in terms of conventional thermodynamics.
	en.wikipedia.org /wiki/Vortex_tube (483 words)

	How Vortex Tubes Work (via CobWeb/3.1 planet03.csc.ncsu.edu) (Site not responding. Last check: 2007-11-02)
		When compressed air is released into the tube through the vortex generator, you get hot air out of one end of the tube and cold air out the other.
		The vortex generator—an interchangeable, stationary part—regulates the volume of compressed air, allowing you to alter the air flows and temperature ranges you can produce with the tube.
		Cold fraction is also a function of the type of vortex generator that's in the tube, i.e., a "high cold fraction" or "low cold fraction" generator.
	www.artxltd.com.cob-web.org:8888 /vortex/principle.shtml (416 words)

	Vortec - Vortex Tubes for Spot Cooling
		Vortex Tubes are an effective, low cost solution to a wide variety of industrial spot and process cooling needs.
		Vortex Tubes have a very wide range of application for industrial spot cooling on machines, assembly lines and processes.
		A Vortex Tube creates cold air and hot air by forcing compressed air through a generation chamber which spins the air centrifugally along the inner walls of the Tube at a high rate of speed (1,000,000 RPM) toward the control valve.
	www.itwvortec.com /vortex_tubes.php (245 words)

	Vortex Tubes From Nex-Flow Technologies
		The vortex tube is unique technology that takes compressed air divides it into two flows - one end of the tube gets hot and the other tube gets cold.
		Some vortex tubes are made of aluminum, but most are now made of stainless steel that is the preferred material due to its greater strength and application in corrosive and high temperature environments.
		Vortex tube technology is applicable to any "spot" cooling or enclosure cooling application where control of temperature and reliability is important.
	www.process-news.com /2005/pn2005_16/nex_flow_vortex_tubes.htm (686 words)

	[No title]
		Vortex tubes are easy to fabricate on a milling machine, thus they can be locally built at the fablab.
		A Vortex tube is a purely fluid mechanical device which seperates a pressurized jet air into a cold and hot components.
		Input air enters the tube from the T-junction, and is forced to form a vortex due to channels machines in plastic.
	fab.cba.mit.edu /labs/tti/ttinew/Voretxv1.html (928 words)

	Vortex-Tube Sediment Extractors. Part I: Trapping Efficiency (Site not responding. Last check: 2007-11-02)
		The vortex tube is a device for extracting sediment from canals that consists of a tube laid horizontally across the canal bed with an open slit along its top edge.
		Flow from near the canal bed is collected in the vortex tube and is extracted from the canal.
		The present paper provides a theory for predicting the trapping efficiency of vortex tubes that is based on a theoretical sediment flux profile for the canal upstream from the vortex tube.
	www.pubs.asce.org /WWWdisplay.cgi?9404561 (187 words)

	Vortex Tubes
		Vortex tubes are the key to beam tube protection in heavy-ion fusion.
		This tube is symmetric, with flow injected through small holes tangent to the inner surface of the pipe wall.
		When flow in the vortex layer reaches the end of the pipe, it fans out, and proper collection of the liquid leaves a clean, dry pathway through the center of the vortex tube.
	www.nuc.berkeley.edu /~pbardet/indexli6.html (475 words)

	MMS Online Exclusive - Vortex Tube Machining Improves Safety While Reducing Environmental Waste - 09/05
		The vortex tube used for the three trials indicated in Table 1 was a Vortec model 610 adjustable cold air gun.
		The vortex tube provided chilled air with a velocity that directed the chips away from the operator; therefore if guarding or screening were used behind the machine tool or workpiece, it is anticipated that chips would accumulate against the screen or guard.
		As the chip velocity and density increase, the effect that the vortex tube had of deflecting chips away from the operator would potentially be less pronounced.
	www.mmsonline.com /articles/0905ex1.html (932 words)

	Vortex rings (Site not responding. Last check: 2007-11-02)
		The ingestion of the piston vortex results in an increased ring impulse and an altered trajectory, when compared to the case when the piston motion is finished piston speed and piston diameter, is the order of three thousand, transition to turbulence is observed during the self-induced translation phase of the ring motion.
		Compared to the case when the piston is stopped inside the tube, the vortex ring which has ingested the piston vortex transitions to turbulence at a significantly reduced distance from the orifice exit and suggests the transition map suggested by Glezer (1988) is somewhat under question.
		The structure of the instability appears to be similar to the streamwise vortex filaments that form in the braid regions of shear layers This instability was subsequently ingested into the primary ring during the translation phase and may act to accelerate the growth of the Tsai-Widnall instability.
	www.princeton.edu /~gasdyn/Vortex/vortex.html (481 words)

	Gyroscopes Online - Vortex Tube -
		Vortex tubes are a type of heat pump.
		Vortex tubes have no moving parts, are almost maintenance free and tend to be very reliable.
		This particular vortex tube is ideal for use with smaller compressors as it does not require a large volume of air.
	www.gyroscope.com /d.asp?product=VORTEXTUBE (361 words)

	Directory:Vortex Technologies - PESWiki
		A vortex is a often turbulent, flow (or any spiral whirling motion) with closed streamlines.
		Vortex Dehydration Systems, LLC (http://vortexdehydration.com) Vortex Dehydration Systems LLC is a cutting edge company focused on integrating Frank Polifka's “Windhexe” into the meat processing industry.
		Universal Vortex (http://www.universal-vortex.com/index.html) has developed a vortex tube that converts the entire inlet flow into a single super cooled and dried jet or into highly intensive heat flux (Single Flow Vortex Tube).
	peswiki.com /index.php/Directory:Vortex_Technologies (1112 words)

	Welcome to UVI - Universal Vortex Inc. (Site not responding. Last check: 2007-11-02)
		Although the Vortex Tube (VT) has existed for decades, its commercial applications were restricted since the conventional VT design requires high inlet pressure and dried processed gas to operate efficiently.
		These Vortex Tubes with a total flow rate of 18 kg/s have been designed by Universal Vortex to perform with a high-pressure air flow and were fabricated under ASME code.
		It is understood that the benefits of the vortex technology become greater when the Vortex Tube operates in the process that requires gas pressure reduction.
	www.universal-vortex.com (632 words)

	Applications of the Vortex Tube (Site not responding. Last check: 2007-11-02)
		The vortex tube is therefore ideal for use in environments where maintenance is difficult or where safety is critical.
		Thus while increasing the size of a tube increases the maximum throughput of air, it also tends to reduce the maximum temperature difference acheivable and hence there seems to be an overall physical limit on the thermal power that can be obtained from tubes of 'conventional' design.
		Chaining vortex tubes together, such that the cold outlet of one leads to the inlet of another could in principle at least reduce the temperature of the working gas to the point where it would liquefy.
	www.southstreet.freeserve.co.uk /rhvtmatl/applic.htm (398 words)

	VORTEX TUBE DETAIL
		As a result, using the vortex tube, lower hydrcarbon and water dewpoints can be achieved for the same pressure drop.
		The Vortex Tube Separator is a long thin tube with a header, a throttle and up to four inlet nozzles, with no moving parts.
		The condensate is thrown to the outer wall of the Vortex Tube Separator and the liquid passes through drain holes at the bottom of the VTS to a separator.
	www.filtan.de /ENGLISH/VTS_A.htm (821 words)

	[No title]
		It is this pure tone that is purportedly responsible for the spec- tacular separation of temperature in a vortex tube.
		In the ab- sence of unsteady disturbances, the air flows in a 'free' vortex around the axis of the tube; the speed of the air is close to ze- ro at the center (like a hurricane), increases to a maximum at mid-radius, and drops to a small value near the walls.
		When, however, the acoustic cavity was adjusted to suppress only the frequency of the vortex whistle (leaving unaffected the rest of the turbulent noise), the temperature difference plunged precipitously at the instant the corresponding input air pressure was reached.
	www.amasci.com /wirbel.txt (1272 words)

	Vortex-Tube Sediment Extractors. Part II: Design (Site not responding. Last check: 2007-11-02)
		The vortex tube is a device for extracting sediment from canals.
		The analysis is then used to form design guidelines so that the following three criteria are satisfied: the difference in head between the canal and the vortex tube outlet is acceptable; the tube does not block with sediment; and water is near uniformly abstracted along the length of the tube.
		Finally, a procedure is given for the design of vortex tubes that uses as input the required trapping efficiency, the required head loss, and the canal characteristics.
	www.pubs.asce.org /WWWdisplay.cgi?9404562 (181 words)

	VORTEX TUBE
		The Vortex Tube can be used as a refrigeration device when the cold pipe wall is used to reduce the temperature of an enclosure or as a heating device when the hot pipe wall is used to increase the temperature of an enclosure.
		The mass flow rate from the cold tube is obtained by applying the conservation of mass principle to the whole system.
		The comparison between vortex tube COP with the conventional refrigeration COP will show that unless high pressure air is inexpensive or the vortex tube simplicity is more important than the cost of operation, the conventional system is better.
	engr.smu.edu /me/2131/Thermolab/vortex/vortex.html (1244 words)

	National Synchrotron Light Source
		The issue of vortex-tube safety lies in the fact that the chilled air flow produced by the vortex tube may increase the amount of high-speed metal chips that are directed toward the machine tool operator.
		Therefore, one way to gauge the safety or lack of safety of a vortex tube is to measure (by weight) the quantity of those chips.
		"We concluded that using a vortex tube does in fact enhance the safety of the operator compared to cases in which no coolant or spray coolant is used," said Haas.
	www.nsls.bnl.gov /newsroom/science/2005/11-Haas.htm (535 words)

	Vortex Tubes
		A Vortex Tube is a low cost, reliable, maintenance-free solution to a variety of industrial spot cooling problems that uses an ordinary supply of compressed air as a power source.
		This cold air tube has a durable, stainless steel construction and there are no moving parts to wear out.
		Vortex Tube - Vortex Tubes provide a reliable, maintenance-free solution to a variety of spot cooling problems.
	www.vortextube.info (436 words)

	Vortex Trap
		Vortex tubes can also be used to separate oil from water.
		When oil and water are spun together in a vortex tube the water, being heavier tends to follow the path of the hot air in the example cited above and the oil being lighter follows the cold air path and exits through the cold air exhaust port.
		The presence of the bubbles indicates cavitation and ariation of the water entering the tube and subsequently a vortex.
	www.subtleenergies.com /ORMUS/research/Vortrap.htm (1802 words)

	Vortex Tubes use compressed air efficiently to provide spot cooling
		A Vortex Tube is a low cost, reliable, maintenance-free solution to a variety of industrial spot cooling problems.
		Using an ordinary supply of compressed air as a power source, vortex tubes create two streams of air, one hot and one cold.
		Sometimes called a Hilsch Tube or Maxwell's Demon, a Vortex Tube can generate temperatures as cold as -50°F and as high as +260°F. Compressed air is supplied to the vortex tube and passes through nozzles that are tangent to an internal counterbore.
	www.vortexcooling.com (390 words)

	Hilsch-Ranque Vortex Tube (Site not responding. Last check: 2007-11-02)
		The tube separates the faster and slower moving molecules in the incoming airstream and sends them to opposite exits.
		The air enters the tube directed tangentially and follows a vortical path with faster moving molecules at the outer radii and slower ones at inner radii.
		The hot air exhaust is at the circumference of the tube and the cold air exhaust is at the center.
	www.oberlin.edu /physics/catalog/demonstrations/thermo/vortextube.html (198 words)

	HIGH FREQUENCY
		But the analysis of vortex break down is difficult in draft tubes compared to pipes, as the flow is in a bent diffuser with swirl.
		The PVC tubes are arranged in layers one above the other and stuck to each other with araldite, the whole structure is rigid and compact and remains in place during the tunnel operation.
		the central vortex core is a straight rope composed of five individual strands of vortices emanating from each blade passage, possibly from the suction surface and hub corners.
	www.ias.ac.in /currsci/dec25/articles20.htm (2677 words)

	dk (Site not responding. Last check: 2007-11-02)
		I originally wanted to use a vortex tube to cool my computer for even more impressive half-life frag fests.
		Undaunted I got thicker pipe, stronger tubing and a bigger blow torch, and made a new one.
		Or there are several companies that sell vortex tubes.
	www.ocf.berkeley.edu /~dlk/tangents/vortex (270 words)

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