Can Sonic Velocity Be Achieved in a Short, Constant Cross-Section Pipe?

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Discussion Overview

The discussion centers on whether sonic velocity can be achieved in a short pipe with a constant cross-section, under the assumption of isentropic flow and neglecting viscous effects. The scope includes theoretical considerations and mathematical reasoning related to fluid dynamics.

Discussion Character

  • Exploratory, Technical explanation, Mathematical reasoning

Main Points Raised

  • One participant questions if sonic velocity can be achieved under the specified conditions.
  • Another participant suggests that achieving sonic velocity is possible if the pressure differential is sufficiently large.
  • A further inquiry is made regarding the specific magnitude of the pressure gradient required to reach sonic velocity.
  • One participant proposes using Bernoulli's equation to estimate the pressure difference needed based on the flow diameter of the tube.

Areas of Agreement / Disagreement

Participants express differing levels of certainty about the conditions required to achieve sonic velocity, with no consensus on the specific pressure gradient needed.

Contextual Notes

Assumptions regarding the neglect of viscous effects and the nature of isentropic flow are critical to the discussion, but these assumptions remain unexamined in detail.

arhanbezbora
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Can sonic velocity be achieved in a short pipe with constant cross-section, assuming isentropic flow with no viscous effects being taken into account?

Thank you.
 
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I can't think of any reason why not as long as the delta P is large enough.
 
Large enough? How large would the pressure gradient need to be? Thanks
 
For a quick calculation, use bernoulli knowing the flow diameter of the tube. Solve for P1-P2
 

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