Fluid Flow Calculation for Gravity-Driven System: Velocity and Pipe Diameter

[birddog]

Hello there,

Im trying to figure this assignment question and I have hit hurdle. Can someone please help with figuring out what the velocity and pipe diameter will be??

Question:
In a plant 20m3(cubic)/h of water at 20 degrees C is to flow via gravity from a storage tank to another one. the difference in elevation is 15m and total pipe length is 50m.

I thought it would be 9.81 m/s because of gravity but that seems too fast.
Can someone please help.

Thanks in advance!

 

[saunderson]

i would give bernoulli's equation a try

$$p + \frac{1}{2} \rho v^2 + \rho g h = \rm{const}$$​

remember:

$$\dot V = \frac{v}{A}$$​

 

[CFDFEAGURU]

Just to be technical on this.

Bernoulli's equation only works well if the viscosity of the fluid can be neglected.

Follow saunderson's post. I just wanted to throw the viscosity bit in.

Thanks
Matt