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Student_handout_L2 - FRICTION IN FLUID FLOW MAE 306 A...

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Page 1 of 4 FRICTION IN FLUID FLOW MAE 306 A. Objective The objective of this investigation is to compare the experimental and theoretical values of the friction coefficient for a smooth pipe and various flow rates. B. Pressure (Head) Loss due to Friction L p 1 p 2 D u Fig. 1: Head loss in fluid flow. Consider the flow in Figure 1. A fluid flowing down a pipe at velocity u will experience a pressure drop from p 1 to p 2 due to internal friction. The mean flow velocity u mean can be determined from the volume flow rate Q and the cross-sectional area of the pipe A as: A Q u mean = . The Reynolds number is defined as: μ ρ D u R mean e = , where is the fluid density , and is the dynamic viscosity . These parameters are tabulated as functions of fluid temperature. D is the pipe diameter. Theoretically, the pressure (head) loss is determined from the Darcy–Weisbach equation. g u D L f p loss Head mean 2 2 = Δ , where L is the pipe length, , and g is the acceleration of gravity. The

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Student_handout_L2 - FRICTION IN FLUID FLOW MAE 306 A...

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