First slide

Fluid dynamics

Question

Which of the following processes will be least affected by the viscosity of water?

Moderate

A

Water flowing through a pipe.
B

Air bubble rising up through water.
C

A wide, shallow sheet of water flowing on a flat surface.
D

Water flowing out through a hole in a tank.

Solution

When water flows out of a hole in a tank, it is in contact with the edges of the hole over a very small area, and therefore viscosity effects are small.

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