Fluid Mechanics - Linear Momentum

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Discussion Overview

The discussion revolves around the application of conservation of linear momentum and Bernoulli's equation in fluid mechanics. Participants are exploring how to relate mass flow rate and velocity using these principles, particularly in the context of a specific problem they are facing.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • Emma mentions using Bernoulli's equation to find V1 and the continuity principle to find V2, but expresses difficulty with the mass flow rate.
  • Emma indicates uncertainty in identifying external body forces and surface forces acting on the fluid.
  • Another participant expresses they are also struggling with the same question and seeks assistance.
  • A different participant comments on the difficulty of the question, suggesting it may be too challenging for an exam.

Areas of Agreement / Disagreement

Participants generally agree on the difficulty of the problem and express a shared struggle with the concepts involved, but no consensus on a solution or approach has been reached.

EmmaJ
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I know the equation for conservation of linear momentum, and Bernoulli's equation:
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So I've tried using Bernoulli's equation to find V1, then use the continuity principle to find V2, but then I get stuck on the mass flow rate.

I tried a different approach by trying to convert mass flow rate and velocity into variables I know, such as density, A1 and A2 but I think really I'm just stuck in correctly identifying the external (body) forces on the fluid and the surface forces on the fluid.

Many thanks for any help offered!

Emma
 
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I'm stuck on this very same question... any help?
 
You go to UNSW? Still haven't worked it out...I'll just hope it's not in the final!
 
Ha ha yeah i do. I'm thinking this question is a bit too nasty for an exam
 

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