Venturi effect - Revision history

Jmdonev: 1 revision imported

2021-12-20T19:47:14Z

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energy>Jmdonev at 23:25, 19 October 2021

2021-10-19T23:25:25Z

← Older revision		Revision as of 23:25, 19 October 2021
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	[[Category: Done ~~2015~~-09-06]]		[[Category:Done 2021-10-29]]
	[[File:Venturifixed2.PNG\|400px\|thumb\|Figure 1. A diagram demonstrating the Venturi effect. The fluid flows faster in at point 2 than at point 1 due to the decrease in cross-sectional area. The [[pressure]] at point 1 is higher however, due to the [[conservation of energy]].<ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/5/54/Venturifixed2.PNG</ref>]]		[[File:Venturifixed2.PNG\|400px\|thumb\|Figure 1. A diagram demonstrating the Venturi effect. The fluid flows faster in at point 2 than at point 1 due to the decrease in cross-sectional area. The [[pressure]] at point 1 is higher than at point 2 however, due to the [[conservation of energy]].<ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/5/54/Venturifixed2.PNG</ref>]]

	<onlyinclude>The '''Venturi effect''' describes how the [[velocity]] of ~~the~~ [[fluid]] increases ~~(thus increasing~~ the [[~~kinetic energy~~]] of the [[~~water~~]]~~) as the cross section~~ of the ~~container decreases, like in a funnel~~.</onlyinclude> In the case of tidal stream ~~generators~~ a duct or shroud (otherwise known as a diffuser) can be used to increase the amount of [[power]] available. A funnel shape is built around or near the [[turbine]] that causes the [[flow rate]] of the water to ~~accelerate - sometimes dramatically~~. These ~~can cause~~ up ~~to 4 or 5 times higher~~ power output than a similar sized turbine without a shroud ~~because it's harnessing~~ the [[energy]] ~~from a greater amount of water~~.<ref ~~name~~=~~Ref11~~>~~Wise Geek. (August 7~~, ~~2015).~~ '~~'What is a Venturi tube?'' [Online~~]~~, Available: http://www.wisegeek.com/what-is-a-venturi-tube~~.~~htm~~</ref>		<onlyinclude>The '''Venturi effect''' describes how the [[velocity]] of a [[fluid]] increases as the [[Cross-sectional area\|cross section]] of the container it flows in decreases (like when flowing through a funnel). The energy in this increased speed comes by reducing the [[static pressure]] of the fluid.</onlyinclude> In the case of [[tidal stream generator]]s, a duct or shroud (otherwise known as a diffuser) can be used to increase the amount of [[power]] available. As seen in Figure 2, a funnel shape is built around or near the [[turbine]] that causes the [[flow rate]] of the water to increase. These tubes speed up the water flow, which makes for a greater power output than a similar sized turbine without a shroud.<ref name=FORE/> The power from turbines increases as the cube of the fluid speed, <math>v^3</math> (if the speed doubles, <math>2^3=8</math> times as much power comes out). The law of [[conservation of energy\|energy conservation]] shows that the increased speed comes while decreasing the pressure.<ref>It's a neat relationship: <math>P + \frac{1}{2} \rho v^2 + \rho g z = constant</math>, read more at [[Bernoulli's equation]].</ref>

	~~Many different styles~~ of [[tidal stream generator]]s ~~can harness the Venturi effect.~~		[[File:venturi effect device.gif\|400px\|thumb\|left\|Figure 2. As the water flows into the Venturi tube, the shape of the shroud makes the water speed up. This higher speed water turns the turbine faster, thereby creating more power.<ref name=FORE>Neil and Hashemi, Fundamentals of Ocean Renewable Energy : Generating Electricity from the Sea pg 71m Elsevier, 2018</ref><ref>Picture also available online http://www.aquaret.com/indexa15e.html?option accessed May 27th, 2021.</ref>]]
			These Venturi effect devices, like the one shown in Figure 2, can be placed in relatively shallow water to take advantage of [[tidal power]] that otherwise wouldn't be available. Shallow ocean water often moves as a result of tides. The symmetry of the Venturi tube allows energy to be harnessed as the tide comes in or out.

			==For Further Reading==
			*[[Tidal power]]
			*[[Tidal barrage]]
			*[[Tidal stream generator]]
			*[[Wind power]]
			*[[Bernoulli's equation]]
			*[[Betz limit]]
			*Or explore a [[Special:Random\| random page]]

	==References==		==References==
	{{reflist}}~~[[Category:Uploaded]]~~		{{reflist}}

J.williams: 1 revision imported

2015-09-18T16:51:46Z

1 revision imported

← Older revision	Revision as of 16:51, 18 September 2015
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Kjstenho at 21:04, 3 September 2015

2015-09-03T21:04:42Z

← Older revision		Revision as of 21:04, 3 September 2015
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	[[Category:Done 2015-08-21]]		[[Category: Done 2015-09-06]]
	[[File:Venturifixed2.PNG\|400px\|thumb\|Figure 1. A diagram demonstrating the Venturi effect. The fluid flows faster in at point 2 than at point 1 due to the decrease in cross-sectional area. The [[pressure]] at point 1 is higher however, due to the [[conservation of energy]].<ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/5/54/Venturifixed2.PNG</ref>]]		[[File:Venturifixed2.PNG\|400px\|thumb\|Figure 1. A diagram demonstrating the Venturi effect. The fluid flows faster in at point 2 than at point 1 due to the decrease in cross-sectional area. The [[pressure]] at point 1 is higher however, due to the [[conservation of energy]].<ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/5/54/Venturifixed2.PNG</ref>]]

	<onlyinclude>The '''Venturi effect''' describes how the [[velocity]] of the [[fluid]] increases (thus increasing the [[kinetic energy]] of the water) as the cross section of the container decreases, like in a funnel.</onlyinclude> In the case of tidal stream generators a duct or shroud (otherwise known as a diffuser) can be used to increase the amount of power available. A funnel shape is built around or near the [[turbine]] that causes the flow rate of the water to accelerate - sometimes dramatically. These can cause up to 4 or 5 times higher power output than a similar sized turbine without a shroud because it's harnessing the energy from a greater amount of water.<ref name=Ref11>Wise Geek. (August 7, 2015). ''What is a Venturi tube?'' [Online], Available: http://www.wisegeek.com/what-is-a-venturi-tube.htm</ref>		<onlyinclude>The '''Venturi effect''' describes how the [[velocity]] of the [[fluid]] increases (thus increasing the [[kinetic energy]] of the [[water]]) as the cross section of the container decreases, like in a funnel.</onlyinclude> In the case of tidal stream generators a duct or shroud (otherwise known as a diffuser) can be used to increase the amount of [[power]] available. A funnel shape is built around or near the [[turbine]] that causes the [[flow rate]] of the water to accelerate - sometimes dramatically. These can cause up to 4 or 5 times higher power output than a similar sized turbine without a shroud because it's harnessing the [[energy]] from a greater amount of water.<ref name=Ref11>Wise Geek. (August 7, 2015). ''What is a Venturi tube?'' [Online], Available: http://www.wisegeek.com/what-is-a-venturi-tube.htm</ref>

	Many different styles of [[tidal stream generator]]s can harness the Venturi effect.		Many different styles of [[tidal stream generator]]s can harness the Venturi effect.

J.williams: 1 revision imported

2015-08-26T21:31:56Z

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J.williams at 18:50, 24 August 2015

2015-08-24T18:50:49Z

New page

[[Category:Done 2015-08-21]]
[[File:Venturifixed2.PNG|400px|thumb|Figure 1. A diagram demonstrating the Venturi effect. The fluid flows faster in at point 2 than at point 1 due to the decrease in cross-sectional area. The [[pressure]] at point 1 is higher however, due to the [[conservation of energy]].<ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/5/54/Venturifixed2.PNG</ref>]]

<onlyinclude>The '''Venturi effect''' describes how the [[velocity]] of the [[fluid]] increases (thus increasing the [[kinetic energy]] of the water) as the cross section of the container decreases, like in a funnel.</onlyinclude> In the case of tidal stream generators a duct or shroud (otherwise known as a diffuser) can be used to increase the amount of power available. A funnel shape is built around or near the [[turbine]] that causes the flow rate of the water to accelerate - sometimes dramatically. These can cause up to 4 or 5 times higher power output than a similar sized turbine without a shroud because it's harnessing the energy from a greater amount of water.<ref name=Ref11>Wise Geek. (August 7, 2015). ''What is a Venturi tube?'' [Online], Available: http://www.wisegeek.com/what-is-a-venturi-tube.htm</ref>

Many different styles of [[tidal stream generator]]s can harness the Venturi effect.

==References==
{{reflist}}[[Category:Uploaded]]