Factors affecting friction factor in fluid flowing through pipe - Fluid Mechanics

Q.  The friction factor in fluid flowing through pipe depends upon
- Published on 05 Aug 15

a. Reynold's number
b. relative roughness of pipe surface
c. both a. and b.
d. none of the above

ANSWER: both a. and b.

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    Discussion

  • Pankaj   -Posted on 30 Sep 15
    The friction loss in pipe is given by Darcy-Weisbach formula given below,

    hf = (4 f L V2) / (2 g D)

    Where,
    f = Darcy's coefficient of friction.

    Sometimes this equation is also written as,

    hf = (f L V2) / (2 g D)

    Here, f is called as 'friction factor'.

    Friction factor = 4 x Darcy's coefficient of friction

    The friction factor is a dimensional less term. It depends upon,

    1. Reynold's number: The friction factor decreases with increase in Reynold's number but beyond certain value it becomes independent of Reynold's number.

    2. Relative roughness of pipe: The friction factor increases with relative roughness of pipe at constant value of Reynold's number.

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