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

Discussion Forum : Mechanical Properties Of Fluids

Question -

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

Options:

A . Liquid of high viscosity and high density flowing through a pipe of small radius

B . Liquid of high viscosity and low density flowing through a pipe of small radius

C . Liquid of low viscosity and low density flowing through a pipe of large radius

D . Liquid of low viscosity and high density flowing through a pipe of large radius

Answer: Option B
:
B

For streamline flow, Reynold's number $N_{R} \propto \frac{r ρ}{η}$ should be less. For less value of $N_{R}$ , radius and density should be small and viscosity should be high.

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