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

Question

In which one of the following cases will the liquid flow in a pipe be most streamlined, Liquid of high viscosity and high density flowing through a pipe of small radius, Liquid of high viscosity and low density flowing through a pipe of small radius, Liquid of low viscosity and low density flowing through a pipe of large radius, Liquid of low viscosity and high density flowing through a pipe of large radius

MARKS App · Accepted Answer

For streamline flow, Reynold's number N R ​ ∝ η r ρ ​ should be less. For less value of N R ​ , radius and density should be small and viscosity should be high.

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