Understanding the Relationship between Turbulence and the Reynold Number

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Homework Help Overview

The discussion revolves around the relationship between turbulence and the Reynolds number, specifically questioning the assertion that complete turbulence is independent of the Reynolds number. Participants are exploring concepts related to fluid dynamics and the Moody diagram.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to understand why turbulence is said to be independent of the Reynolds number in certain contexts. They are questioning the conditions under which turbulence occurs and how it relates to the friction factor as depicted in the Moody diagram.

Discussion Status

The discussion is ongoing, with some participants seeking clarification on the concepts presented. There is an indication that guidance has been offered regarding the relationship between the friction factor and the Reynolds number, but no consensus has been reached on the interpretation of these concepts.

Contextual Notes

Participants are referencing specific materials and diagrams, such as the Moody diagram, to support their inquiries. There is an emphasis on understanding the conditions for complete turbulence and the role of pipe roughness in this context.

werson tan
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Homework Statement


why the author gave that the complete turbulenece is indpendent on the Reynold number ?

Homework Equations

The Attempt at a Solution


For the turbulence to occur , the Reynold number must be higher than certain value , am i right . So , IMO , turbulenet is dependent on the Reynold number
 

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werson tan said:

Homework Statement


why the author gave that the complete turbulenece is indpendent on the Reynold number ?

Homework Equations

The Attempt at a Solution


For the turbulence to occur , the Reynold number must be higher than certain value , am i right . So , IMO , turbulenet is dependent on the Reynold number
You're not correctly comprehending what this slide is saying.

First, it's discussing the friction factor f as it's plotted on the Moody diagram:

6837190_f520.jpg


In the zone where the flow is completely turbulent, i.e. to the right of the dashed line, the friction factor is constant w.r.t. the Reynolds number. In this region, the friction factor f depends on the relative pipe roughness only.
 
SteamKing said:
You're not correctly comprehending what this slide is saying.

First, it's discussing the friction factor f as it's plotted on the Moody diagram:

6837190_f520.jpg


In the zone where the flow is completely turbulent, i.e. to the right of the dashed line, the friction factor is constant w.r.t. the Reynolds number. In this region, the friction factor f depends on the relative pipe roughness only.

SteamKing said:
You're not correctly comprehending what this slide is saying.

First, it's discussing the friction factor f as it's plotted on the Moody diagram:

6837190_f520.jpg


In the zone where the flow is completely turbulent, i.e. to the right of the dashed line, the friction factor is constant w.r.t. the Reynolds number. In this region, the friction factor f depends on the relative pipe roughness only.
Can you explain this phenomenon?
 
werson tan said:
Can you explain this phenomenon?
You can read a more detailed explanation here:

https://www.uio.no/studier/emner/matnat/math/MEK4450/h11/undervisningsmateriale/modul-5/Pipeflow_intro.pdf
 
SteamKing said:
You can read a more detailed explanation here:

https://www.uio.no/studier/emner/matnat/math/MEK4450/h11/undervisningsmateriale/modul-5/Pipeflow_intro.pdf
this is the book that i use . can you expalin why during the complete turbulent , it is independent of reynold number ?
 

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