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Which of the following flow is less efficient than radial flow?

(a) Bottom flow

(b) Spherical flow

(c) Turbulent flow

(d) Linear flow

I had been asked this question in an internship interview.

Question is taken from Well Hydraulics topic in chapter Well Hydraulics of Geotechnical Engineering I

1 Answer

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Correct option is (b) Spherical flow

Easiest explanation: The discharge of spherical flow qs is given by, qs/q =2.3(r/b) log10 1000

Let r =8cm =0.08 m

R/r =1000; b=16 m

qS/q =2.3(0.08/16) log10 1000

qS/q = 1/30

This shows that the spherical flow is much less efficient than the radial flow.

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