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What is the most common assumption while dealing with fluid flow problems using continuity equation?

(a) Flow is assumed to be compressible

(b) Flow is assumed to be unsteady

(c) Flow is assumed to be steady

(d) Flow is assumed to be turbulent

The question was asked in my homework.

This intriguing question originated from Continuity Equation in Two and Three Dimensions in portion Kinematics of Flow and Ideal Flow of Fluid Mechanics

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Best answer
Right choice is (c) Flow is assumed to be steady

The explanation: In majority of the fluid flow problems, flow is assumed to be steady.

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