Discussion
The flow of an unbounded fluid over a surface is called as __________ when fluid is completely bounded by solid surface.
Answer: D
The answer is external flow and internal flow.
Flow of a fluid that is unbounded and passes over a surface, such as air over a wing or a plate, is called external flow. Flow that is completely enclosed by solid walls, such as flow in a pipe or duct, is called internal flow. That pair fills the two blanks in order.
The other pairs classify flow on other grounds: uniform and non-uniform by change with position, viscous and inviscid by whether friction is counted, and laminar and turbulent by the regime of motion.
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