Calculating velocity/depth change in narrowing open channel
Calculating velocity/depth change in narrowing open channel
(OP)
For a currant project I am designing a model waterwheel to work in a flume. Basically I am narrowing the flume in order to increase the fluid velocity.
I know that the equation u1.a1=u2.a2 cannot be used as this is for a closed pipe but have heard there is an equation to calculate for open channels.
Is anyone able to point me in the right direction?
Thanks,
Mike
I know that the equation u1.a1=u2.a2 cannot be used as this is for a closed pipe but have heard there is an equation to calculate for open channels.
Is anyone able to point me in the right direction?
Thanks,
Mike





RE: Calculating velocity/depth change in narrowing open channel
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RE: Calculating velocity/depth change in narrowing open channel
Mike
RE: Calculating velocity/depth change in narrowing open channel
Mike
RE: Calculating velocity/depth change in narrowing open channel
iterate hydraulic depth until your calculated discharge converges
RE: Calculating velocity/depth change in narrowing open channel
Water is travelling down a flume, with dimensions of flow 0.6x0.05m at 1.67m/s. I want to narrow the flow in a 0.1m wide channel.
And I would then like to calculate the new velocity and depth.
Is this data sufficient to carry out the iteration you mention?
Thanks, I really appreciate this.
RE: Calculating velocity/depth change in narrowing open channel
From "BigInch's Extremely simple theory of everything."
RE: Calculating velocity/depth change in narrowing open channel
does slope change?
In addition to the large increase in water depth due to the very narrow flume, there will also be some energy loss in the contraction. how long is the transition?
RE: Calculating velocity/depth change in narrowing open channel
Patricia Lougheed
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RE: Calculating velocity/depth change in narrowing open channel
I understand there will be lots of losses, so by the sounds of it, there isn't really an equation that will be able to calculate anything with any accuracy?
Mike
RE: Calculating velocity/depth change in narrowing open channel
Piping Design Central ://www.gul fpub.com/p roduct.asp ?PositionI D=campaign &Produ ctID=10679">The Planning Guide to Piping Design</a>
www.pipingdesign.com
<a href="http
RE: Calculating velocity/depth change in narrowing open channel
RE: Calculating velocity/depth change in narrowing open channel
Mike
RE: Calculating velocity/depth change in narrowing open channel
If it backed up, rather than spilled over, perhaps enough head would be available to increase velocity in the narrows a little, even if the slope wasn't steepened. If it spilled over, velocity wouldn't have a chance to increase under any circumstances.
From "BigInch's Extremely simple theory of everything."