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How to build a tapered pump outlet
Last Post 13 Dec 2008 11:06 AM by Greg McFadden. 6 Replies.
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12 Dec 2008 07:07 PM

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Danny #3
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12 Dec 2008 09:48 PM
Wow Danny, that is really cool. There is some interesting pump tech out there and I may have to give it another look.
Rob A.
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12 Dec 2008 11:15 PM
nice.
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13 Dec 2008 02:21 AM
Why doesn't the flow go right to left thru the nozzle above?
Battling: SMS Scharnhorst, SMS Baden Building: HMS KGV (Drives, pumps water, guns are in but not plumbed) MN Edgar Quinet (Hull done) Drydock/Mothballed: Rus Evstafi, DKM Lutzow, HMS Invincible Plus 20-odd other projects, according to my Boy Scouts who thoughtfully counted them for me.
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13 Dec 2008 09:50 AM
from a fluid mechanics point of view, at the downstream side of the orifice, the flow is in an unstable condition, with pressure increasing in the direction of flow. You need to be "gentile" to the fluid in this condition to prevent loss inducing secondary flows and separation from the surface... hence the long lead out. Upstream of the orifice, you are accelerating the fluid, meaning that the pressure gradient is negative in the direction of flow, which is a stable flow regime to be in, so you can be more aggressive with the changes in geometry...
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13 Dec 2008 10:25 AM
So that means the way I have it set up is correct? (i.e. the best for max water flow)
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13 Dec 2008 11:06 AM
in theory... when you throw air into the mix it can get trickeier
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