

Water Block Design / Construction Building your own block? Need info on designing one? Heres where to do it 
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05222003, 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. 
05222003, 08:33 AM  #252 
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where did the 0.4085 came out of? :shrug:
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05222003, 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. 
05222003, 08:59 AM  #254 
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Why do you use imperial units?
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05222003, 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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05222003, 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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05222003, 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: 
05222003, 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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05222003, 11:45 AM  #259  
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Quote:
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. 

05222003, 11:47 AM  #260  
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Quote:
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05222003, 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. 
05222003, 12:14 PM  #262 
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Here's the spreadsheet: have fun!

05222003, 12:59 PM  #263 
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i hate inches and all imperial measurments
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05222003, 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! 
05222003, 02:11 PM  #265  
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Quote:
can any one check it out for me please?
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