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Affect on water flow through reduced diameter section of pipe?
Been too long since I studied fluid mechanics at Uni, and I must say that when I was there I never thought I would need to know this stuff.
I have a very large commercial garden and want to get new water hoses. I obviously want to deliver as much water in as little time as possible. I was planning to have 25m lengths of hose with perhaps up to 3 or 4 in sequence (75 - 100m max). The water pressure is up to 5 bar, but will probably be used at less than max.
Hoses are available here in 3/4" or 1/2" diameter, however the various attachments (spray nozzle, etc.) are only available for the 1/2" hose. An adapter to enable 1/2" hose attachments to connect to 3/4" hose is available.
Is there any point in buying 3/4" hose if planning to use 1/2" attachments? How does the final reduction in "conduit" diameter affect the flow? Do you understand what I am trying to say?
Thanks in advance
A taxed mind
If at its final point, the water is leaving a 1/2 inch diameter opening, it will be leaving at basically the same velocity no matter if you are using a 3/4 inch hose being reduced with a 1/2 inch attachment or using a 1/2 inch hose. There will be energy losses based on the diameter reductions but these probably won't affect anything too much. If you are reducing the flow with the attachment at the end there will be added pressure in the 3/4 inch hose as opposed to using a 1/2 inch hose with no flow reduction at the end.
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