Is the Flow Laminar or Turbulent? Determining with Reynolds Number

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SUMMARY

The discussion focuses on determining the flow type—laminar or turbulent—using the Reynolds number for water at 10°C flowing at 2 m/s in a 100-mm pipe. The calculated Reynolds number is 152671.8, indicating turbulent flow, as it exceeds the threshold of 4000. The method employed for calculation is correct, although attention to significant figures is advised for precision.

PREREQUISITES
  • Understanding of fluid dynamics concepts, specifically laminar and turbulent flow.
  • Familiarity with the Reynolds number and its significance in fluid mechanics.
  • Knowledge of basic fluid properties such as viscosity and density.
  • Ability to perform calculations involving the formula Re=ρVd/μ.
NEXT STEPS
  • Study the implications of Reynolds number thresholds for different flow types.
  • Learn about the effects of temperature on fluid viscosity and density.
  • Explore practical applications of Reynolds number in engineering and design.
  • Investigate methods to measure flow characteristics in real-world scenarios.
USEFUL FOR

Students in engineering or physics, fluid mechanics researchers, and professionals involved in hydraulic system design will benefit from this discussion.

joe98
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Homework Statement



For the following situations of steady flow, determine whether the flow is laminar or
turbulent based on Reynolds number: water at 10oC flowing at an average velocity of
2 m/s in a 100-mm pipe, (Viscosity of water at 10oC: 1.31 cP, density: 1000 kg/m3)

Homework Equations



Re=ρVd/μ=vL/viscosity

The Attempt at a Solution




so Re=(1000x2x0.1)/(1.31x10^-3)=152671.8

therefore its turbulent flow

Am I correct in this method?
 
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Yes but watch your significant figures.
 

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