How Can I Calculate Flow Pressure Drop in a Two-Dimensional Diffuser?

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Discussion Overview

The discussion revolves around calculating the flow pressure drop in a two-dimensional diffuser, focusing on fluid dynamics principles and potential resources for further study. Participants explore theoretical approaches and seek clarification on the problem presented.

Discussion Character

  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant requests assistance in calculating the flow pressure drop, providing specific parameters such as average flow velocity and fluid temperature.
  • Another participant expresses difficulty in understanding the schematic provided and requests a clearer version.
  • A later reply suggests that mass flow at the inlet should equal mass flow at the outlet, proposing the use of Bernoulli's equation under the assumption of incompressible flow to calculate the pressure drop.
  • There is a discussion about the lack of examples in fluid dynamics handbooks, with one participant questioning this claim and recommending specific textbooks for reference.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the availability of examples in fluid dynamics literature, and there are differing opinions on the clarity of the provided schematic. The discussion remains unresolved regarding the specific calculation method for the pressure drop.

Contextual Notes

Limitations include the assumption of incompressible flow and the need for clearer visual aids to facilitate understanding. The discussion also highlights the dependency on specific fluid dynamics textbooks for guidance.

Who May Find This Useful

Individuals interested in fluid dynamics, particularly those studying or working with two-dimensional diffusers and pressure drop calculations, may find this discussion relevant.

me_ia
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Hey!
I need to calculate the flow pressure drop inside a two dimensional diffuser (please see image below).
nozzle.jpg

The average flow velocity at the inlet is 0.095 m/s.
The fluid is air at a temperature T=373K .

I can't find any close model at any fluid dynamics handbook.

Does anyone know how can I calculate this?

I will highly appreciate any kind of help!
Thanks!
 
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The schematic is not very helpful, at least for me. Can you make a new, more clear one?
 
I hope this is clearer:

nozzle.jpg
 
Much more clear now. You have the Mass flow at the inlet which should be equal to the mass flow at the outlet.
Q(in) = Q (out). From this you can compute the outflow velocity (and you already have the inflow velocity).
Then, provided the flow is incompressible, you have Bernulli's equation to calculate the pressure drop...
Which fluid mechanics book do you use?
 
I will do so... thanks very much!
 
Which fluid mechanics book did you say you use?
 
I use non at the moment, do you recommend a specific book?
 
I asked because I found it quite strange what you said that you can't find any similar example at any fluid dynamics handbook...
I would recommend the book Fluid Mechanics by Kundu and Cohen or the Fundamentals of Fluid Mechanics by Munson.
 

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