How to correlate the amount of water to its speed?

Question

For example, a fire hydrant shoots water at 200 liters a second, how to convert this to its velocity?

Answer 1

v(m/s) = Q(m3/s) / Nozzle Area(m2)

Answer 2

Hi,

Bernoulli's principle should help you out with this question.

V^2/2 + gh + P/d = Constant

Where:
V = Velocity of fluid
g= gravity
h = height
P = pressure
d = density.

In our case, gravity doesn't matter because we are talking about horizontal flow, so height is effectively zero. Also the density of water is defined as 1.

so now we have

V^2/2 + P = Constant = c

V^2 = 2(c - P)

V= Sqrt (2(c-P)).

Hope that helps,
Matt

Answer 3

You need to know the size of the pipe/opening the water flows through.
then the volume per sec = velocity x area