Physics · Fluid Dynamics
In turbulent flow through a smooth pipe, which of the following best describes the factor(s) that influence the Darcy friction factor?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1It is determined primarily by the Reynolds number and is practically independent of pipe roughness, as the pipe is hydraulically smooth.✓
- 2It depends on both the Reynolds number and pipe roughness, but the relative roughness effect becomes completely negligible at extremely high Reynolds numbers.
- 3It is inversely proportional to the Reynolds number in transitional flow, but becomes completely constant in fully developed turbulent flow.
- 4It decreases with increasing Reynolds number, but is heavily affected by pipe diameter and roughness at all flow rates.
Correct answer
It is determined primarily by the Reynolds number and is practically independent of pipe roughness, as the pipe is hydraulically smooth.
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