# Flow in a semi circular pipe

1. Nov 25, 2008

### nitinhanda

Hi All:

I am trying to calculate volumetris flow rate in a semi circular pipe with a fixed pressure but seem to have problems. I have calculated in a circular pipe as

Q= (Pi (P1-P2) R^4)/8uL

Can anyone comment on how to calculate for semi circular pipes?

Regards

2. Nov 26, 2008

### CaptainPanic

Q= (Pi (P1-P2) R^4)/8uL

First of all: always write down what the symbols mean. Now I have to guess, and that's not helping. If I make a mistake (because I use other symbols because I live on another continent perhaps) we waste time.

Assuming that
Pi = 3.14 (-)
P1 and P2 = pressure (Pa)
u = Viscosity (Pa*s)
L = length (meter)

Then Q is the volumetric flowrate, in (m3/s), which seems correct.

The next question is: what is "semicircular"?
Does it mean that it was a round pipe (like almost all pipes) and that it's now flat on one side? Or did somebody put a bend of 180 degrees in a normal pipe?

The pressure difference in a pipe depends on the wall-roughness, bends, flowrate (turbulent or laminar flow) and type of fluid, to name a few factors.

I don't see enough information here.

I'm sorry if I just made life more difficult, but I cannot simply give you the other formula like that... because I don't know it (I'd need more info!)

3. Nov 26, 2008

### nitinhanda

Hi:

I am sorry for not being clear.

Yes you were right in assuming the symbols. The tube was circular but now its flat on one side - so you are right there also. We can assume steady state laminar flow. We are applying a constant pressure and can assume the tube to be smooth. There is no bend in the tube and we can have the answer in terms of "u - viscosity".

Please let me know if you need any other information.

Thanks

4. Apr 20, 2009

### piyushmor

Re: Flow in a semi circular pipe Heat Transfer

Can Anyone please tell me what is the heat transfer coefficient for convection in a semi-circular pipe???