(adsbygoogle = window.adsbygoogle || []).push({}); Hello!

1. The problem statement, all variables and given/known data

Symbols and variables:

##\dot{V}## : flow rate

##H## : Hydraulic head

##g = 9.81 \frac{N}{kg}##

##P_{atmosphere} = 101325Pa##

##\rho = 1000\frac{kg}{m^3}##

I am given a piping system, with serie and parallel pipes, they start from one point and go back in to one point.

I need to plot the hydraulic head (the medium in the piping system is water at 20°C, and the local flow loses are negligible) in function of the flow rate, for ##H(\dot{V}=0 \frac{m^3}{s})## to ##H(QMax)##.

With ##QMax## the flow rate where the hydraulic head is 3 times the hydraulic head by zero flow.

The question:

My instruction paper is in dutch (reason why i didn't upload it)

- How can I calculate the hydraulic head by zero flow

- How can I calculate the maximal flow rate

2. Relevant equations

In my instruction paper:

$$H = \frac{P_{In} - P_{atmosphere}}{g\rho}$$

Further the mechanical equation out of my syllabi:

$$H_1 - H_2 = R\dot{V}$$

3. The attempt at a solution

In appendix.

I also includes a plot from what I think the solution is. (hydraulic head in function of flow rate)

But what i don't understand, how can (according to my solution) the hydraulic head be negative.

Does someone know how or knows a resource.

Thanks in advance,

Good day!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Hydraulic head as a function of flow rate

Tags:

Have something to add?

**Physics Forums | Science Articles, Homework Help, Discussion**