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The hydraulic radius RH of circular tube is given by ________

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The hydraulic radius RH of circular tube is given by ________

(a) RH=R/4

(b) RH=R/6

(c) RH=R/2

(d) RH=R/12

I had been asked this question in class test.

Question is taken from Poiseuille’s Law topic in chapter Permeability of Geotechnical Engineering I

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Right answer is (c) RH=R/2

Explanation: The hydraulic radius RH is defined as the ratio of the area of the tube to the wetted perimeter.

∴  RH=A/P=πR^2/2πR

∴  RH=R/2.

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