Math and or Fluid Flow Gurus. Spraybar hole calculations

[Dr Joe]

If you use clear tubing for the vertical, it will save you alot of guess work too.

Of course you realize you maximizing this for a flow from a clean filter system, so I suggest you leave a little back-pressure in the equation to allow for BB & detritus buildup causing flow degradation (since we seem to be getting so critical here).

Hint #1: I don't see pressure being introduced into any of your equations, and this is were things are falling down.

Hint #2: Flow vs Velocity.

We used to have someone that worked with fluid dynamics...



Your all on the right track, but could have been finished by now if you just got the length of pipe you wanted for the spray bar and drilled 1/8" holes in it and then enlarged them til you had acceptable flow (then told everybody it was too technical to explain ).

Dr Joe

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[Dan F]

If you use clear tubing for the vertical, it will save you alot of guess work too.

Of course you realize you maximizing this for a flow from a clean filter system, so I suggest you leave a little back-pressure in the equation to allow for BB & detritus buildup causing flow degradation (since we seem to be getting so critical here).

Hint #1: I don't see pressure being introduced into any of your equations, and this is were things are falling down.

Hint #2: Flow vs Velocity.

We used to have someone that worked with fluid dynamics...



Your all on the right track, but could have been finished by now if you just got the length of pipe you wanted for the spray bar and drilled 1/8" holes in it and then enlarged them til you had acceptable flow (then told everybody it was too technical to explain ).

Dr Joe

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Dr. Joe, why do you always have to be so practical?

You could also just add more and more 1/8 or 3/32 holes until you had the right flow. PVC is cheap - make a few spraybars and see which one you like best, that's what I usually end up doing.

 

[Jgray152]

Hint #1: I don't see pressure being introduced into any of your equations, and this is were things are falling down.

You don't need to figure pressure into the equations when we are figuring with flow volume and velocity through a 1" piece of pipe. Because the pressure is what it is. Now obveously if we restrict the flow, the volume of flow will be reduced and the pressure will increase.

Water (specifically) flowing through a 1" pipe at a rate of 600 GPH had X as a velocity means you have Y as a pressure. If you had 1000 GPH flowing through a 1" pipe then you have Y as a pressure. Thats how I look at it.

 

[Dr Joe]

I figured it out... It's 30*F in NH and Jgray152 can't go outside so he's trying to drive us crazy too!

 

[Jgray152]

^ Yesterday it was almost 50*F!!! The warmest its been in a while. Just a couple days before that it was 10*F!

Haha.

You think im driving you crazy here, you should see what I have been talking about on the fishforums.com DIY site about my Fx5....

 

[Oosh]

Complete opposite set of problems down here, it rarely drops below 50F (I guess I'll speak in your silly Fahrenheit ), and last year we had a record 15 days straight with 95F and above maximums (numerous 100F-105F days) and worst of all there was a over week straight in there where the temp never dropped below 70F at night.

Not a lot of fun when the only AC was in lounge room.

 

[Dr Joe]

It's ok Oosh, we can translate for our foreigner friends , even the upsidedown ones!

Dr Joe

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[cichness]

man, that was alot of technical stuff i didnt completly follow..... i was thinkin about putting a spray bar on my magnum 350 and try to rig a custom biowheel rigging

 

[Jgray152]

Well im back. We were out of power for 4 days because of an VERY bad ice storm up here. I have never seen so much destruction in my life. Other than what I have seen on TV.

I lost 4 fish, 1 tiger barb, 1 elephant nose, 1 electric yellow and something else I forget the name.