Reynolds & Velocity: Finding Mean & Max Velocities

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SUMMARY

The discussion focuses on calculating mean and maximum velocities in a pipe using the Reynolds number (RE) and pipe size, specifically for water. It is confirmed that the velocity used in the computation of the Reynolds number is the mean velocity. The user seeks clarification on whether the transposed formula for RE provides mean or maximum velocity, with the consensus being that it yields the mean velocity. Additional parameters discussed include velocity pressure and pressure drop.

PREREQUISITES
  • Understanding of Reynolds number (RE) calculations
  • Knowledge of fluid properties, specifically density and dynamic viscosity of water
  • Familiarity with fluid dynamics concepts, including velocity profiles in pipes
  • Basic mathematical skills for transposing formulas
NEXT STEPS
  • Research the derivation of the Reynolds number formula in fluid dynamics
  • Learn about velocity profiles in laminar and turbulent flow conditions
  • Explore methods for calculating pressure drop in pipes using Darcy-Weisbach equation
  • Study the relationship between mean velocity and maximum velocity in fluid flow
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Engineers, fluid dynamics students, and professionals involved in hydraulic system design or analysis who need to understand velocity calculations in pipe flow.

Libertiene
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Hi,

I have been given a couple of questions in which i have to draw a velocity profile in a pipe etc.

We are asked to find the mean & maximum velocitys, velocity pressure & pressure drop. the only 2 parameters we are given are the RE (Reynolds number) & pipe size. We are also told that the fluid is water. So thus we know the density & dynamic viscosity.

The only way i can see that i can find the velocity would be to transpose the formula for RE to get velocity (please correct me if I am wrong). But my question is, would this be the mean or maximum velocity? I have assumed mean, but if i am wrong i have stuffed the hole thing.

Regards
 
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Libertiene said:
Hi,

I have been given a couple of questions in which i have to draw a velocity profile in a pipe etc.

We are asked to find the mean & maximum velocitys, velocity pressure & pressure drop. the only 2 parameters we are given are the RE (Reynolds number) & pipe size. We are also told that the fluid is water. So thus we know the density & dynamic viscosity.

The only way i can see that i can find the velocity would be to transpose the formula for RE to get velocity (please correct me if I am wrong). But my question is, would this be the mean or maximum velocity? I have assumed mean, but if i am wrong i have stuffed the hole thing.

Regards

The velocity used in the computation of the Reynold's number is indeed the mean velocity.

CS
 

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