Question

In turbulent flow through a pipe of
radius R, at what distance from the
boundary would the local velocity be
equal to the mean velocity ?
(A) 0.22 R (B) 0.37 R
(C) 0.5R (D) 0.707 R​

Answer 1

Answer:

(C) 0.5R

Explanation:

The velocity profile for turbulent flow is fuller than for the laminar flow, whereas a relationship between the average and axial velocities ū/u0 depends on the Re number, being about 0.8 at Re = 104 and increasing as Re rises.

With the laminar flow, the ratio is constant and equal to 0.5R. A general specific feature of the near-wall turbulent flows is the presence, on the wall, of a thin viscous sublayer, wherein molecular viscosity forces are dominant and the velocity distribution is linear.

Answer 2

Answer:

A) 0.22,

Explanation:

use u-v/uf = 5.75 log10 (y/R)+3.75

its a formula for velocity distribution through smooth and rough pipe