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Question

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


Solution

The correct option is D Liquid of high viscosity and low density flowing through a pipe of small radius
For streamline flow, Reynold's number NRrρη should be less. For less value of NR, radius and density should be small and viscosity should be high.

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