Pumping issues

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Pumping issues

Post  Qays Hassan on Sat Apr 30, 2016 4:12 am

Hello Everyone,
I am planning to build a laminar fountain in my campus which will include around 15 laminar jets.
I know the fluid mechanics and I know reynolds number as well but I'm having a bit difficulty in pumping the water into each jet.. Kindly resolve my queries as soon as possible.
- How many pump will I need for 15 jets? and what will be their specifications?
- How much  pressure is needed for an arch of min 8ft length and 7ft height? how do you guys calculate it any article regarding this will be much helpful so that I can understand the maths as well
- And how to restrict the flow of pump to the desired pressure?

If you know the answer of any of these questions kindly help and if there is something about the pump procedure which I should take care of do mention it...

Qays Hassan
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Re: Pumping issues

Post  Ike on Sun May 01, 2016 11:09 am

These are some loaded questions that you'll need some more information to answer:

- Its best if you can have one pump per nozzle for several reasons. 1) Its easier to control the output and arch size of each nozzle with a dedicated pump. 2) If you use one pump for more than one nozzle you'll most likely have a supply line going to multiple nozzles from the same pump. As the water goes down the line it will continually lose pressure from each nozzle meaning that the first nozzle in line will have a much larger arch than the last nozzle in the supply line. 3) Having a very steady pump is important to reduce pressure jitter. This could be harder with a large pump unless you move to an industrial high grade pump in which case it will be very expensive. Smaller fountain pumps might be easier to get smooth

- To calculate pressure you'll have to go find the fluid equations to translate pressure in a pipe to velocity and then from there run the velocity through the standard physics kinematic equations to turn that in to a distance traveled. This question is easier answered in terms of flow rate since that is what most pumps are rated for. The other factors you'll have to take in to account is head pressure and restrictions. If the pump has to pump the water up in elevation to the nozzle at all that will add head pressure and reduce the flow rate. If you use small pipes then the flow restriction will add head pressure and reduce your flow rate. The nozzle itself will add back pressure and reduce flow rate which depends on the internals of the nozzle. To help, my first nozzle used a 1 inch supply hose, 8 inch nozzle, 1 foot of vertical lift from pump to nozzle and a 500 GPM pump which achieved about the arch size you are looking to get.

- You can use an inline valve to add back pressure and reduce the flow rate. You'll need to make sure this is a large valve though so it doesn't cause flow restrictions even when fully open. The other options is that some pumps have an adjustable inlet restriction. If you purchase this type of pump then you can use that to adjust it

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