What does compressible flow look like in a duct undergoing heating/cooling?

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Discussion Overview

The discussion revolves around the visualization of compressible flow in a duct undergoing heating and cooling. Participants explore the properties and behavior of the flow, particularly in the context of Rayleigh flow, and seek to understand the implications of temperature changes on the flow characteristics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant expresses difficulty in visualizing compressible flow and seeks to understand the property changes that occur in a duct during heating and cooling.
  • Reference material includes a textbook on fluid mechanics, specifically discussing Rayleigh flow and property changes associated with it.
  • There is a question about whether the heating or cooling of the fluid is uniform across the duct's cross-section at a given point.
  • Another participant suggests looking for resources or individuals who can help visualize compressible flows.
  • A participant shares a link to a resource that may provide useful visualizations of compressible flows.
  • One participant speculates about the creation of an artificial nozzle effect due to the heating or cooling of the fluid, indicating a personal interpretation of the flow behavior.

Areas of Agreement / Disagreement

The discussion remains unresolved, with participants exploring various ideas and seeking resources without reaching a consensus on the visualization of compressible flows or the implications of heating and cooling.

Contextual Notes

Participants have not established specific assumptions regarding the uniformity of temperature changes across the duct's cross-section, nor have they resolved the implications of the heating/cooling on flow characteristics.

s34n
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Been trying to find out what compressible flows would look like, to picture why you get the not so intuitive property changes.

Started with looking into what might be happening in Rayleigh flow. there's plently of examples on how to use maths to calculate property changes when going from inlet to outlet of a duct, but I've not been able to find anything that gives a visual picture of what is happening with the flow within the duct and at the heating/cooling point.

My reference material has been this book link to pdf copy of Fluid Mechanics: Fundamentals & Applications (link to copyright book removed by moderator) , Rayleigh flow starting at page 693 of the book (718 of the PDF).
And the table for Rayleigh flow property changes, Table 12-3 on page 696 (721 of pdf).

Should I be thinking of the heating/cooling causing a creation of an artifical nozzel out of the affected fluid at the wall of the duct?

Is the heating/cooling of the fluid meant to be equal across the cross section of the duct at the one point?

Cheers
 
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Thread is in Moderation for Mentor review...
 
After deleting a link to a PDF textbook copy of questionable origin, this thread is re-opened.
 
If anyone has any suggestions on where to look or who/where to ask about visualising compressible flows, that would be welcomed as well.

Cheers
 
Thanks onatirec.

Interesting video. Its those sorts of images and ideas that make me think maybe there's a nozzel being created out of the affected fluid, but thats just my crazy thoughts at the moment.

Cheers
 

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