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Water Block Design / Construction Building your own block? Need info on designing one? Heres where to do it

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Unread 05-22-2003, 08:27 AM   #251
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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.
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Unread 05-22-2003, 08:33 AM   #252
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where did the 0.4085 came out of? :shrug:
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Unread 05-22-2003, 08:54 AM   #253
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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.
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Unread 05-22-2003, 08:59 AM   #254
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Why do you use imperial units?
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Unread 05-22-2003, 09:18 AM   #255
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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
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Unread 05-22-2003, 09:27 AM   #256
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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
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Unread 05-22-2003, 09:45 AM   #257
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The area would be calculated as Pi * (diameter / 2) ^2.

Now how did I calculate the rest...:shrug:
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Unread 05-22-2003, 09:50 AM   #258
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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??
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Unread 05-22-2003, 11:45 AM   #259
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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.
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Unread 05-22-2003, 11:47 AM   #260
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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.
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Unread 05-22-2003, 12:09 PM   #261
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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.
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Unread 05-22-2003, 12:14 PM   #262
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Here's the spreadsheet: have fun!
Attached Files
File Type: zip flow rate calc.zip (4.9 KB, 16 views)
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Unread 05-22-2003, 12:59 PM   #263
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i hate inches and all imperial measurments
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Unread 05-22-2003, 01:14 PM   #264
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All the figures are converted on the spreadsheet, but the inputs (red boxes) are in imperial, yes.

Change it around: it's not hard!
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Unread 05-22-2003, 02:11 PM   #265
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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?
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