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laminar flow in inclined pipe

laminar flow in inclined pipe

laminar flow in inclined pipe

(OP)
Hi

I am trying to define acceleration of fluid in an inclined pipe. I need to express it in a function so I can iterate it. I know the velocity entering the pipe and need to solve for velocity exiting. The acceleration of the fluid is dependent on the angle of the incline. Any suggestions or place to start?

Thanks

RE: laminar flow in inclined pipe

What causes the fluid to accelerate?
Does the mass flow change over the length of the pipe?
Where did the fluid come from?
Where is the fluid going?
Is the fluid compressible?



Mike Halloran
Pembroke Pines, FL, USA

RE: laminar flow in inclined pipe

(OP)
the fluid is water from a tank (i found the velocity of that already)
it accelerates due to the increase of slope
No change in heat, mass, pressure, or density
no external work

Think of a pipe on a see saw, as it tips the water will accelerate to the downhill side. That is the acceleration i need to define.

Thanks

RE: laminar flow in inclined pipe

Yeah, I remember trying to fill a bucket from a sink faucet with a straight inclined pipe when no hose was available.

Got my shoes pretty wet.

It gets especially messy when the free surface travels up the pipe while the water is still traveling down. Messy, mathematically and physically.

I probably should have removed my shoes and used them to transfer the water incrementally.

You didn't mention a tank or a seesaw before. I know you can see the problem you're trying to solve, in your head, plain as day. We can't see it.

We can't see the parts you haven't included in your description.

Also, we can't see the impossible parts you've been glossing over in your mind. I do that too. I can imagine most anything, working just fine, until I try to make a drawing of it. In that sense, making a drawing is a way of forcing your mind to be honest with itself.



Mike Halloran
Pembroke Pines, FL, USA

RE: laminar flow in inclined pipe

sounds like gravity flow in a sewer or drain. suggest mannings equation for normal depth flow. you need the flow rate and an estimate of the n value, to complete this calculation.

RE: laminar flow in inclined pipe

(OP)
thanks I think manning equation can work

RE: laminar flow in inclined pipe

"Any suggestions or place to start". A good drawing.

If what you're talking about is a pipe which starts full then moves to a partially full pipe as it empties to the open air then you have a variety of things going on which are changing until you get to steady state. This is very difficult to work out.

This can only really happen if you restrict the flow into the pipe or introduce a hill in the way and a pump.

.If you're talking about an open pipe like a sewer then the velocity will be steady very fast as friction equals the head per metre available.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

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