# example 16-2 - Example 16-2 Clean engine oil is pumped...

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Example 16-2 Clean engine oil is pumped through a pipe ½ in. in diameter and 10 ft long, as shown. Pressure is atmospheric both at the inlet to the pump and at the exit from the pipe. The average velocity of the oil is 1.5 ft/s. Assuming fully-developed laminar flow, calculate the pressure rise across the pump (in psia) and the power input of the pump (in hp) if the oil temperature is a) 70°F b) 40°F Solution The pressure drop from the exit of the pump to the exit of the pipe is 2 8 m L P R µ ∆= V From EES, the viscosity of the oil at 70°F is 1888 lbm/ft·h. () 2 2 2 lbm ft 1lbf 1h 81888 10 f t 1 .5 lbm ft ft h s 3600s 32.2 s 0.5 in 2 P ⎛⎞ ⎜⎟ ⎝⎠ 31.3psia

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example 16-2 - Example 16-2 Clean engine oil is pumped...

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