Finding the Darcy-Weisbach Friction Factor with Limited Info

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Discussion Overview

The discussion revolves around finding the Darcy-Weisbach friction factor using the Moody diagram, specifically when limited information is available, such as the Reynolds number. The context is a homework problem involving fluid dynamics.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant, Ben, expresses difficulty in calculating the Reynolds number due to insufficient information about the fluid properties.
  • Another participant questions whether the problem statement specifies the type of fluid, suggesting that this information is crucial for solving the problem.
  • A further reply suggests assuming fully developed turbulent flow, indicating a potential approach to simplify the problem, but asks for clarification on the pipe material.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as there are multiple uncertainties regarding the fluid type and pipe material, which are essential for calculating the Reynolds number and subsequently the friction factor.

Contextual Notes

The discussion highlights limitations due to missing assumptions about the fluid properties and the pipe material, which affect the ability to calculate the Reynolds number.

ben49
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Homework Statement


I need to find the Darcy Weibach friction factor from the moody diagram but i cannot find reynolds number?

All the information i have is K = 0.02mm D = 150mm Q=100 l/s

The only formula for RE i found is RE = (density) x (velocity) x (diameter of pipe) / (dynamic viscocity)

Im really stuck.

Any help would be much appreciated.

Thanks

Ben


Homework Equations





The Attempt at a Solution

 
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Did the problem statement tell you what the fluid is (e.g oil, water)?
 
No it didnt?
 
You may need to assume fully developed turbulent flow then. What is the pipe material (e.g. steel, PVC)?
 

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