What Is the Impact of Throat Velocity on Pressure According to Bernoulli's Law?

[gerdsmit]

According to Bernouilli's law there is a direct relation between pressure drop and fluid's velocity at the throat. What would be the physical meaning of a high value negative absolute pressure that theoretically can be achieved by increasing fluid's throat velocity.

 

[sp1408]

It would probably mean that the pressure experienced before the throat is increased,

In the eq P1 + 1/2DV1^2 = -P2 + 1/2DV2^2,
bring _p2 to the other side

=>P1+P2 + 1/2DV1^2 = 1/2DV2^2

(D=density,P1 = initial press.,P2=final pressure,same for V1 and V2)

implying that the original pressure is increased...
Hope you understand what I am trying to say...(good question though)

 

[stewartcs]

According to Bernouilli's [equation] there is a direct relation between pressure drop and fluid's velocity at the throat. What would be the physical meaning of a high value negative absolute pressure that theoretically can be achieved by increasing fluid's throat velocity.

It is nonsensical since absolute pressures cannot be negative.

CS

 

[FredGarvin]

Absolute limit of velocity in any throat is going to be sonic velocity. There's your limit right there.