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Question

Water flows at a speed of 16 cm/s through a tube of radius 10 cm. Co-efficient of viscocity of water at room temperature is 0.01 poise. Then, find the Reynolds number.
  1. 3000
  2. 2800
  3. 3200
  4. 3400


Solution

The correct option is C 3200
Given, speed of water, (v)=16 cm/s=16×102 m/s
Co-efficient of viscocity of water, η=0.01 poise
Radius of tube, (r)=10 cm
Diameter of tube, (D)=2r=20 cm=20×102 m/s
Density of water, ρ=1000 kg/m3
We know from the definition of 
Reynolds number, (R)=ρvDη
=1000×16×102×20×1020.01
R=3200
Hence, option (c) is the correct answer.

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