Squirrel By Balinju & Hara - Page 11

bigben2k · 05-22-2003, 08:27 AM

I used an Excel spreadsheet: it was simpler to plug various numbers!

The formulae I used multiplies 0.4085 by the flow rate (gpm), then divides it by the diameter of the tubing. The result gives the flow speed, in feet per second.

Balinju · 05-22-2003, 08:33 AM

where did the 0.4085 came out of? :shrug:

bigben2k · 05-22-2003, 08:54 AM

Hum... let me see if I can remember!

I believe that the number comes from all the constants put together which would include the calculation of the opening area, and a conversion of the "gallon" into it's volumetric equivalent (cubic inches?).

Let me think about it.

hara · 05-22-2003, 08:59 AM

Why do you use imperial units?

Balinju · 05-22-2003, 09:18 AM

ben, this is what i can get from my equation,
if v=flow/area
then v=flow/(pi*r^2)
which is v=flow/(pi/4*diameter^2)
which gives v=1.27*flow/diameter^2

i can't immagine how the hell did exel to get the denominatior to diameter and not to diameter squared.

even me hates imperial units

Balinju · 05-22-2003, 09:27 AM

even according to base units, if you get the equation the exel gave you 0.4085 * flow/diameter = velocity

left hand side: meters^3*Seconds^-1*meters^-1 = meters^2*Seconds^-1
right hand side: meters*second^-1

i think my equation at least is constante with respect to base units v=flow/area

right hand side: meters^3*seconds^-1*Meters^-2=meters*Seconds^-1
Left hand side: meters*second^-1

bigben2k · 05-22-2003, 09:45 AM

The area would be calculated as Pi * (diameter / 2) ^2.

Now how did I calculate the rest...:shrug:

Balinju · 05-22-2003, 09:50 AM

that is what i am trying to figure out also

i said that area = pi/4 * (diameter)^2 which is as yours pi*(diameter/2)^2 no??

bigben2k · 05-22-2003, 11:45 AM

Quote:

Originally posted by bigben2k
I used an Excel spreadsheet: it was simpler to plug various numbers!

The formulae I used multiplies 0.4085 by the flow rate (gpm), then divides it by the diameter of the tubing. The result gives the flow speed, in feet per second.

A correction:

The formulae is: 0.4085 * the flow rate, divided by the SQUARE of the diameter.

That makes more sense. Ya'll give me a few more minutes to iron this out.

Balinju · 05-22-2003, 11:47 AM

Quote:

Originally posted by bigben2k
A correction:

The formulae is: 0.4085 * the flow rate, divided by the SQUARE of the diameter.

That makes more sense. Ya'll give me a few more minutes to iron this out.

at least now the formula is correct with respect to the base units.

bigben2k · 05-22-2003, 12:09 PM

Got it.

A gallon converts to cubic inches, by multiplying by 231.

The flow rate is converted from gpm to in^3/second, by multiplying it by 3.85 .

The result then appears in inches which, when divided by 12 (inches in a foot), gives the flow speed in feet per second.

bigben2k · 05-22-2003, 12:14 PM

Here's the spreadsheet: have fun!

Balinju · 05-22-2003, 12:59 PM

i hate inches and all imperial measurments

bigben2k · 05-22-2003, 01:14 PM

All the figures are converted on the spreadsheet, but the inputs (red boxes) are in imperial, yes.

Change it around: it's not hard!

Balinju · 05-22-2003, 02:11 PM

Quote:

Originally posted by bigben2k
All the figures are converted on the spreadsheet, but the inputs (red boxes) are in imperial, yes.

Change it around: it's not hard!

i think it is better using the formula i derived

, only if it completly correct.

can any one check it out for me please?

05-22-2003, 08:27 AM	#251
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	I used an Excel spreadsheet: it was simpler to plug various numbers! The formulae I used multiplies 0.4085 by the flow rate (gpm), then divides it by the diameter of the tubing. The result gives the flow speed, in feet per second. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-22-2003, 08:33 AM	#252
Balinju Cooling Savant Join Date: Dec 2002 Location: Malta Posts: 495	where did the 0.4085 came out of? :shrug: __________________ So the bullet proof vest aint a $hit when d laser is pointed to your head Kid

05-22-2003, 08:54 AM	#253
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Hum... let me see if I can remember! I believe that the number comes from all the constants put together which would include the calculation of the opening area, and a conversion of the "gallon" into it's volumetric equivalent (cubic inches?). Let me think about it. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-22-2003, 08:59 AM	#254
hara Cooling Savant Join Date: Oct 2002 Location: Malta, Mediterranean Posts: 662	Why do you use imperial units? __________________ - Every great HD crash day is the day before back-up day. - My Past System - "Better to reign in Hell than serve in Heaven." - Milton, Paradise Lost. - FMZ

05-22-2003, 09:18 AM	#255
Balinju Cooling Savant Join Date: Dec 2002 Location: Malta Posts: 495	ben, this is what i can get from my equation, if v=flow/area then v=flow/(pir^2) which is v=flow/(pi/4diameter^2) which gives v=1.27*flow/diameter^2 i can't immagine how the hell did exel to get the denominatior to diameter and not to diameter squared. even me hates imperial units __________________ So the bullet proof vest aint a $hit when d laser is pointed to your head Kid

05-22-2003, 09:27 AM	#256
Balinju Cooling Savant Join Date: Dec 2002 Location: Malta Posts: 495	even according to base units, if you get the equation the exel gave you 0.4085 * flow/diameter = velocity left hand side: meters^3Seconds^-1meters^-1 = *meters^2Seconds^-1 right hand side: meterssecond^-1* i think my equation at least is constante with respect to base units v=flow/area right hand side: meters^3seconds^-1Meters^-2=*metersSeconds^-1 Left hand side: meterssecond^-1* __________________ So the bullet proof vest aint a $hit when d laser is pointed to your head Kid

05-22-2003, 09:45 AM	#257
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	The area would be calculated as Pi * (diameter / 2) ^2. Now how did I calculate the rest...:shrug: __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-22-2003, 09:50 AM	#258
Balinju Cooling Savant Join Date: Dec 2002 Location: Malta Posts: 495	that is what i am trying to figure out also i said that area = pi/4 * (diameter)^2 which is as yours pi*(diameter/2)^2 no?? __________________ So the bullet proof vest aint a $hit when d laser is pointed to your head Kid

05-22-2003, 12:09 PM	#261
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Got it. A gallon converts to cubic inches, by multiplying by 231. The flow rate is converted from gpm to in^3/second, by multiplying it by 3.85 . The result then appears in inches which, when divided by 12 (inches in a foot), gives the flow speed in feet per second. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-22-2003, 12:59 PM	#263
Balinju Cooling Savant Join Date: Dec 2002 Location: Malta Posts: 495	i hate inches and all imperial measurments __________________ So the bullet proof vest aint a $hit when d laser is pointed to your head Kid

05-22-2003, 01:14 PM	#264
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	All the figures are converted on the spreadsheet, but the inputs (red boxes) are in imperial, yes. Change it around: it's not hard! __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

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