• Card 16 / 35: Water flows through a narrow (ID = 750 micron) capillary at 1 ml/min. The surface of the capillary is smooth. The capillary is 1 m long. Calculate the pressure drop over a 1 m length.
    A) 2.1 kPa
    B) 2.1 Pa
    C) 42 kPa
    D) 21 Pa
    E) 4.2 Pa

    Answer:
    A) 2.1 kPa

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Explanation:

First calculate v = (1 ml/min) (1 min/60sec) (1/(0.0375 x 0.0375 x 3.14)) = 3.77 cm/s. Re = 28. Flow is laminar. One may use a Moody plot for laminar flow, but the corresponding equation for Re, as given on the Engineers Edge website linked in Unit 4, is preferable. In the present case Δ P= (64/28) x (L/D) x( ρ/2) x v2=2.1kPa.

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Thermal-Fluid Systems ME303

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Attribution:  Dr. Steve Gibbs. Thermal-Fluid Systems. The Saylor Academy 2014, http://www.saylor.org/courses/me303/
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