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pranj5
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Kindly supply some net links that I can download directly.
Can a Convergent Nozzle Achieve High Pressure with Subsonic Exit Velocity?
- Thread starter Sunfire
- Start date
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- Tags
- Convergent Nozzle Physics
Click For Summary
Discussion Overview
The discussion revolves around the feasibility of achieving high pressure in a convergent nozzle while maintaining a subsonic exit velocity for air. Participants explore the implications of nozzle geometry, pressure ratios, and the application of Bernoulli's equation in this context.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
- Mathematical reasoning
Main Points Raised
- One participant questions whether a convergent nozzle can achieve high pressure while keeping the exit velocity below sonic, seeking the highest possible inlet pressure.
- Another participant references Bernoulli's equation, suggesting it could apply under certain assumptions, but acknowledges limitations regarding compressibility.
- A participant introduces the concept of critical pressure ratio for subsonic nozzles, proposing it as a threshold for pressure ratios before the flow becomes sonic.
- Some participants express uncertainty about the applicability of Bernoulli's equation for air at higher velocities, noting that air behaves as incompressible only below a certain Mach number.
- There are discussions about the implications of back pressure and how it restricts the maximum achievable inlet pressure without reaching sonic conditions.
- Participants debate the effects of nozzle geometry on pressure ratios and mass flow rates, with some suggesting that only convergent nozzles limit the ability to increase reservoir pressure effectively.
- Questions arise regarding the choking phenomenon in convergent-divergent nozzles and whether the throat can exceed Mach 1, with mixed responses about the definitions and implications of choking flow.
- One participant expresses a desire for clarification on the concept of choked flow and its relationship to upstream and downstream conditions.
Areas of Agreement / Disagreement
Participants do not reach a consensus on the applicability of Bernoulli's equation for the scenario described, nor on the implications of critical pressure ratios and choking in nozzles. Multiple competing views remain regarding the effects of nozzle geometry and the definitions of choking flow.
Contextual Notes
Limitations include assumptions about fluid behavior, the applicability of Bernoulli's equation under varying conditions, and the specific definitions of choking flow that are not universally agreed upon among participants.
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