Rayleigh flow - Revision history

en>Monkbot: /* References */Task 5: Fix CS1 deprecated coauthor parameter errors

2014-07-24T01:13:54Z

References: Task 5: Fix CS1 deprecated coauthor parameter errors

← Older revision		Revision as of 03:13, 24 July 2014
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	~~{{Refimprove\|date=June 2011}}~~		Ed is what individuals call me and my spouse doesn't like it at all. He is an info officer. Alaska is the only place I've been residing in but now I'm contemplating other options. Doing ballet is some thing she would never give up.<br><br>Also visit my web site; [http://netwk.hannam.ac.kr/xe/data_2/85669 telephone psychic]
	~~The '''affinity laws''~~' are used in [[hydraulics]] and [[HVAC]] to express the relationship between variables involved in pump or fan performance (such as [[head (hydraulic)\|head]], [[volumetric flow rate]], shaft speed) and [[Power (physics)\|power]]. They apply to [[pump]]s, [[fan (mechanical)\|fans]], and [[hydraulic turbine]]s. In these rotary implements, the affinity laws apply both to centrifugal and axial flows.

	~~The affinity laws are useful as they allow prediction of the head discharge characteristic of a pump or fan from a known characteristic measured~~ at ~~a different speed or impeller diameter~~. ~~The only requirement~~ is ~~that the two pumps or fans are dynamically similar, that~~ is the ~~ratios of the fluid forced are the same.~~

	'''~~Law 1~~. ~~With impeller diameter (D) held constant:'''~~

	~~Law 1a. Flow~~ is ~~proportional to shaft speed:,<ref name=pumpfun>{{cite web\|url=http://www.pumpfundamentals.com/yahoo/affinity_laws.pdf\|title=Affinity Laws\|work=www.pumpfundamentals~~.~~com}}~~<~~/ref~~><~~ref~~>~~{{cite~~ web~~\|url=http://www.airturbine.com/fanlaws.html\|title=Basic Fan Laws - Axial Fan Blades\|work=airturbine propeller company}}</ref>~~
	~~: <math> { Q_1 \over \ Q_2} = { \left ( {N_1 \over N_2} \right )} </math>~~

	~~Law 1b. Pressure or Head is proportional to the square of shaft speed:~~
	~~: <math> {H_1 \over H_2} = { \left ( {N_1 \over N_2} \right )^2 }</math>~~

	~~Law 1c. Power is proportional to the cube of shaft speed:~~
	~~: <math> {P_1 \over P_2} = { \left ( {N_1 \over N_2} \right )^3 }</math>~~

	~~'''Law 2. With shaft speed (N) held constant:''' <ref name=pumpfun />~~

	~~Law 2a. Flow is proportional to the impeller diameter to the 3rd power:~~
	~~: <math> { Q_1 \over \ Q_2} = { \left ( {D_1 \over D_2} \right )^3 } </math>~~

	~~Law 2b. Pressure or Head is proportional to the square of impeller diameter:~~
	~~: <math> {H_1 \over H_2} = { \left ( {D_1 \over D_2} \right )^2 }</math>~~

	~~Law 2c. Power is proportional to the fifth power of impeller diameter:~~
	~~: <math> {P_1 \over P_2} = { \left ( {D_1 \over D_2} \right )^5 }</math>~~
	http://~~www.engineeringtoolbox.com/affinity-laws-d_408~~.~~html~~

	~~where~~
	* <math> Q </math> is the volumetric flow rate (e.g. ~~[[Cubic feet per minute\|CFM]], GPM or L~~/~~s),~~
	* <math> D </~~math> is the impeller diameter (e.g. in or mm),~~
	* <math> N </~~math> is the shaft rotational speed (e.g. [[rpm]]),~~
	* <math> H </math> is the pressure or head developed by the fan/pump (e.g. psi or Pascal), and
	* <math> P </math> is the shaft power (e.g. W).

	These laws assume that the pump/fan efficiency remains constant i.e. <math> \eta_1 = \eta_2 </math> . When applied to pumps the laws work well for constant diameter variable speed case (Law 1) but are less accurate for constant speed variable impeller diameter case (Law 2).

	~~==References==~~
	~~<references />~~

	~~{{DEFAULTSORT:Affinity Laws}}~~
	~~[[Category:Hydraulics]]~~
	~~[[Category:Pumps]]~~
	~~[[Category:Fans]]~~
	~~[[Category:Turbines]~~]

	~~{{Mech-engineering-stub}}~~

en>Josve05a: clean up using AWB (9844)

2014-01-07T12:07:15Z

clean up using AWB (9844)

← Older revision		Revision as of 14:07, 7 January 2014
Line 1:		Line 1:
	The ~~author~~'s name is ~~Christy Brookins~~. ~~Since he was eighteen he~~'~~s been working as an info officer but he plans on changing it~~. I'~~ve always loved residing in Kentucky but now I~~'~~m considering other options~~. ~~To perform lacross~~ is the ~~factor I love most~~ of ~~all.~~<br><br>~~my homepage~~ :: ~~accurate psychic predictions - [~~http://www.~~chk~~.~~woobi~~.co.kr/xe/~~?document_srl=346069 www~~.~~chk~~.~~woobi~~.co.kr],		{{Refimprove\|date=June 2011}}
			The '''affinity laws''' are used in [[hydraulics]] and [[HVAC]] to express the relationship between variables involved in pump or fan performance (such as [[head (hydraulic)\|head]], [[volumetric flow rate]], shaft speed) and [[Power (physics)\|power]]. They apply to [[pump]]s, [[fan (mechanical)\|fans]], and [[hydraulic turbine]]s. In these rotary implements, the affinity laws apply both to centrifugal and axial flows.

			The affinity laws are useful as they allow prediction of the head discharge characteristic of a pump or fan from a known characteristic measured at a different speed or impeller diameter. The only requirement is that the two pumps or fans are dynamically similar, that is the ratios of the fluid forced are the same.

			'''Law 1. With impeller diameter (D) held constant:'''

			Law 1a. Flow is proportional to shaft speed:,<ref name=pumpfun>{{cite web\|url=http://www.pumpfundamentals.com/yahoo/affinity_laws.pdf\|title=Affinity Laws\|work=www.pumpfundamentals.com}}</ref><ref>{{cite web\|url=http://www.airturbine.com/fanlaws.html\|title=Basic Fan Laws - Axial Fan Blades\|work=airturbine propeller company}}</ref>
			: <math> { Q_1 \over \ Q_2} = { \left ( {N_1 \over N_2} \right )} </math>

			Law 1b. Pressure or Head is proportional to the square of shaft speed:
			: <math> {H_1 \over H_2} = { \left ( {N_1 \over N_2} \right )^2 }</math>

			Law 1c. Power is proportional to the cube of shaft speed:
			: <math> {P_1 \over P_2} = { \left ( {N_1 \over N_2} \right )^3 }</math>

			'''Law 2. With shaft speed (N) held constant:''' <ref name=pumpfun />

			Law 2a. Flow is proportional to the impeller diameter to the 3rd power:
			: <math> { Q_1 \over \ Q_2} = { \left ( {D_1 \over D_2} \right )^3 } </math>

			Law 2b. Pressure or Head is proportional to the square of impeller diameter:
			: <math> {H_1 \over H_2} = { \left ( {D_1 \over D_2} \right )^2 }</math>

			Law 2c. Power is proportional to the fifth power of impeller diameter:
			: <math> {P_1 \over P_2} = { \left ( {D_1 \over D_2} \right )^5 }</math>
			http://www.engineeringtoolbox.com/affinity-laws-d_408.html

			where
			* <math> Q </math> is the volumetric flow rate (e.g. [[Cubic feet per minute\|CFM]], GPM or L/s),
			* <math> D </math> is the impeller diameter (e.g. in or mm),
			* <math> N </math> is the shaft rotational speed (e.g. [[rpm]]),
			* <math> H </math> is the pressure or head developed by the fan/pump (e.g. psi or Pascal), and
			* <math> P </math> is the shaft power (e.g. W).

			These laws assume that the pump/fan efficiency remains constant i.e. <math> \eta_1 = \eta_2 </math> . When applied to pumps the laws work well for constant diameter variable speed case (Law 1) but are less accurate for constant speed variable impeller diameter case (Law 2).

			==References==
			<references />

			{{DEFAULTSORT:Affinity Laws}}
			[[Category:Hydraulics]]
			[[Category:Pumps]]
			[[Category:Fans]]
			[[Category:Turbines]]

			{{Mech-engineering-stub}}

en>Helpful Pixie Bot: ISBNs (Build KG)

2012-05-11T14:57:47Z

ISBNs (Build KG)

New page

The author's name is Christy Brookins. Since he was eighteen he's been working as an info officer but he plans on changing it. I've always loved residing in Kentucky but now I'm considering other options. To perform lacross is the factor I love most of all.<br><br>my homepage :: accurate psychic predictions - [http://www.chk.woobi.co.kr/xe/?document_srl=346069 www.chk.woobi.co.kr],