Help with D'Arcy's: Finding Head Difference between Res.

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SUMMARY

The discussion focuses on calculating the head difference between two reservoirs connected by a pipe using D'Arcy's equation. The user has data on flow rate, pipe length, diameter, and roughness but lacks the frictional coefficient and pressure information. A participant clarifies that the frictional coefficient can be determined using the Moody diagram, which does not require pressure data. The conversation emphasizes the importance of utilizing the Moody diagram to solve the problem effectively.

PREREQUISITES
  • Understanding of D'Arcy's equation for fluid flow
  • Familiarity with the Moody diagram for determining friction factors
  • Knowledge of pipe flow characteristics including diameter and roughness
  • Basic principles of fluid mechanics
NEXT STEPS
  • Study the application of D'Arcy's equation in fluid dynamics
  • Learn how to use the Moody diagram for calculating friction factors
  • Research the impact of pipe roughness on flow characteristics
  • Explore methods for measuring flow rate in pipe systems
USEFUL FOR

Engineers, fluid mechanics students, and professionals involved in hydraulic design and analysis will benefit from this discussion.

eddierolling
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hi

me again sorry.

i have a problem to solve finding the head difference between two reservoirs connected by a pipe.

i have to use D'Arcy's equation to solve this.

the only data i have is the flow rate, the pipe length and diameter. i also have the pipe roughness in mm but i don't have the frictional coefficient or any pressures in the pipe or reservoirs.

i have searched the net and books i have access to and to find the Frictional coefficient i seem to need pressures.

am i missing something or can this problem not be solved without additional information?

thanks
 
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The problem can be solved. You do not need pressurse to find frictional coefficient; perhaps you are forgetting your Moody diagram?

Give it a try and show your work and from there we can guide you through the rest.
 

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