Question

Why is viscous force directly proportional to velocity gradient

Answer 1

Answer:

There's this concept in fluid dynamics called the “No-slip condition” where you assume that at a fluid solid interface the velocity of the solid is the same as the fluid. This means that the viscous force must be dependent on the velocity of the fluid.

Answer 2

Answer:

There's this concept in fluid dynamics called the “No-slip condition” where you assume that at a fluid solid interface thevelocity of the solid is the same as the fluid. This means that the viscous force must be dependent on thevelocity of the fluid.

Explanation:

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