Calculating diameter of vertical pipe

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prbirdo
Posts: 2
Joined: Mon Feb 06, 2012 1:53 pm

Calculating diameter of vertical pipe

Post by prbirdo »

Ok I have been given the task of figuring out this equation and need some help.

The principle is that a fulid or solid particls fall vertically through a detector.
The length of the drop is 0.962 m.
The flow rate is 30,000 puonds.hour
bulk density is 40 pounds per cubic foot.


I am given A = [0.024*Flowrate]/Bulkdensity. to calculate the diameter of the pipe.

the velocity from drop is 4.34ms^-1

There can be a coefficent of friction on the pipe of 0.2

Any Ideas were this has come from? 0.024???
The challenge is on
PipeFlowCalcs
Posts: 57
Joined: Sat Sep 17, 2011 8:50 am

Re: Calculating diameter of vertical pipe

Post by PipeFlowCalcs »

Here is how you can calculate pipe diameter.
Also, you can use pipe diameter calculator.
From calculator you will have velocity also.

Here is how you can calculate friction coefficient for pipe line.

Static pressure of 0.962 m and 40lb/ft3 fluid is p=rho*g*h=640.6 kg/m3 * 9.81 * 0.962 m = 6045 Pa and I will set this is in pressure drop calculator as p1, which is in absolute values 101325 Pa + 6045 Pa =107370 Pa , and p2 is 101325 Pa (if flows to atmosphere). This means that flow is established between two points with pressure difference of 6045 Pa.

I have attached screen shoot of calculation in pressure drop calculator.

Two things you must also know, pipe roughness and fluid viscosity.

This calculation is based on assumption that fluid is newtonian, but solid/liquid mixtures are often non-newtonian fluids, so take care of that also.

In image you will see that diameter is 46 mm, velocity 3.5 m/s, friction coefficient 0.249, but this all depends on pipe roughness and fluid viscosity.
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prbirdo
Posts: 2
Joined: Mon Feb 06, 2012 1:53 pm

Re: Calculating diameter of vertical pipe

Post by prbirdo »

Thanks this is real helpful, main problem is that companies which are putting cornflakes for example down do not give a viscosity.
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