Why does friction factor decrease with Reynolds number?

Thread starter Ram7788
Start date Mar 8, 2016
Tags

decrease Fluid dynamics Friction Friction factor Reynolds Reynolds number

Click For Summary

SUMMARY

The discussion centers on the relationship between friction factor and Reynolds number (Re) in fluid dynamics. As flow rate increases, the frictional force rises; however, both the Darcy and Fanning friction factors decrease with increasing Reynolds number. This phenomenon is attributed to the transition from laminar to turbulent flow, where the flow becomes more efficient, reducing the friction factor despite higher velocities. Understanding this relationship is crucial for engineers and scientists working with fluid mechanics.

PREREQUISITES

Understanding of fluid dynamics principles
Familiarity with Reynolds number and its significance
Knowledge of Darcy and Fanning friction factors
Basic concepts of laminar and turbulent flow

NEXT STEPS

Research the derivation of the Darcy-Weisbach equation
Study the transition criteria between laminar and turbulent flow
Explore the impact of surface roughness on friction factors
Learn about computational fluid dynamics (CFD) simulations for flow analysis

USEFUL FOR

Engineers, fluid mechanics researchers, and students studying fluid dynamics who seek to understand the behavior of friction factors in relation to flow rates and Reynolds number.

Mar 8, 2016

Ram7788

As the flow rate increases frictional force increases but friction factor(Darcy,Fanning) decreases with Re. Can anyone explain what is the concept behind it?