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Question

In which one of the following cases will the liquid flow in a pipe be most streamlined

A
Liquid of high viscosity and high density flowing through a pipe of small radius
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B
Liquid of high viscosity and low density flowing through a pipe of small radius
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C
Liquid of low viscosity and low density flowing through a pipe of large radius
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D
Liquid of low viscosity and high density flowing through a pipe of large radius
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Solution

The correct option is B Liquid of high viscosity and low density flowing through a pipe of small radius
For a streamline or laminar flow, Reynold's number, NR=ρvDη should be less.
So, for lesser value of NR, diameter (or radius) and density should be small and viscosity should be high.

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