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Which of the following is NOT a type of force considered in the Navier-Stokes equation?

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in Fluid Mechanics by (118k points)
Which of the following is NOT a type of force considered in the Navier-Stokes equation?

(a) Gravity force

(b) Pressure force

(c) Surface tension force

(d) Viscous force

The question was asked in an international level competition.

Question is taken from Introduction to Fluid Dynamics in section Fluid Dynamics of Fluid Mechanics

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Best answer
The correct option is (c) Surface tension force

The explanation: Gravity, Pressure force and viscous forces together constitute the derivation of the Navier-Stokes equation. Though surface tension force act on a fluid in motion, it is considered to be negligible for the Navier-Stokes equation.

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