- #1
PTlusitano
- 3
- 0
Dear all,
I have found in the literature that if there is a open tank discharging water into the atmosphere the pressure at the discharge point is considered to be equal to the atmospheric pressure.
If one looks to the Bernoulli's equation and assuming no friction:
Pressure + Elevation Pressure + Dynamic pressure = Total Pressure
So, my question is:
Why do they consider the Pressure at the discharge point to be equal to the atmospheric pressure and not the Total Pressure instead? Shouldn't it be similar to the Venturi case, where there is a pressure decrease due to an increase in velocity.
Couldn't we be pumping water against atmospheric pressure with a Pressure< 101 325 Pa but compensated by the discharge velocity of 5 m/s, for example (no calculations done)?
Regards
I have found in the literature that if there is a open tank discharging water into the atmosphere the pressure at the discharge point is considered to be equal to the atmospheric pressure.
If one looks to the Bernoulli's equation and assuming no friction:
Pressure + Elevation Pressure + Dynamic pressure = Total Pressure
So, my question is:
Why do they consider the Pressure at the discharge point to be equal to the atmospheric pressure and not the Total Pressure instead? Shouldn't it be similar to the Venturi case, where there is a pressure decrease due to an increase in velocity.
Couldn't we be pumping water against atmospheric pressure with a Pressure< 101 325 Pa but compensated by the discharge velocity of 5 m/s, for example (no calculations done)?
Regards