The mechanical-energy balance provides a basis for estimating pressure drop owing to friction in fluid flow. For
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Where ff is the Fanning friction factor, Churchill11 gives the flowing expression for fF for turbulent flow:
Here, Re is the Reynolds number, and (ε/D) is the dimensionless pipe roughness. Turbulent flow obtains for Re > 3,000.
Consider the flow of liquid water at 25oC. For one of the sets of conditions given below, determine (in kg s-1) and P / L (in kPa m'1). Assume ε / D = 0.0001. Fur liquid water at 25oC, ( = 9% kg m-3 and ( = 9.0 à l0-4 kg m-l s-1. Verify that the flow is turbulent.
D = 2 cm. u = 1 m s-1
D = 5 cm. u = 1 m s-1
D = 2cm, u = 5ms-1
D = 5 cm. u = 5 m s-l
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Related Book For
Introduction to Chemical Engineering Thermodynamics
ISBN: 978-0071247085
7th edition
Authors: J. M. Smith, H. C. Van Ness, M. M. Abbott
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