Need a confirmation. Bernoulli.

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In the discussion, participants analyze the implications of Bernoulli's principle in the context of ideal fluid flow through a pipe with an orifice. They agree that there is a loss of stagnation pressure as the fluid exits into a reservoir at atmospheric pressure, with static pressure at the exit equating to atmospheric pressure. The conversation highlights that Bernoulli's equation may not apply due to significant energy losses from viscous dissipation, particularly between sections of the flow. Participants emphasize that while static pressure can remain constant, total pressure is not conserved in real fluid dynamics scenarios, especially when considering orifice effects. Overall, the consensus is that ideal flow assumptions do not hold in practical applications, leading to pressure losses that must be accounted for.
  • #31
Q_Goest said:
I'm not stubborn, I've been doing this for so long I don't need to think about it any more.

Your experience is not a seal of guarantee. My father is 61 years and he keeps on being wrong in some things.

I must say the truth, and the truth is that the phrase "Bernoulli with losses" DOESN'T REPRESENT THE BERNOULLI EQUATION, BECAUSE BERNOULLI EQUATION DOES NOT CALCULATE ANY LOSS, BECAUSE BERNOULLI EQUATION STATES THE CONSERVATION OF STAGNATION PRESSURE. The fact of calling Bernoulli to an equation which APPARENTLY is similar to Bernoulli is a MISCONCEPTION, no matter how long have you been calling it Bernoulli.
 
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  • #32
For those interested, I have simulated the original problem in Fluent 6.0. I have attached the Total Pressure Contours. Red color means highest total pressure and blue color the lowest one. The computational mesh is axisymmetric, so the lowest line is a symmetry axe.
 

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