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What is the dimension for drag coefficient?

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+1 vote
in Fluid Mechanics by (118k points)
What is the dimension for drag coefficient?

(a) Newton/s

(b) m/s

(c) kg/N

(d) Dimensionless

I have been asked this question in homework.

Query is from Drag on a Sphere in division Boundary Layer Flow & Forces on Sub-merged Bodies of Fluid Mechanics

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+2 votes
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Best answer
Correct answer is (d) Dimensionless

To explain I would say: In fluid dynamics, the drag coefficient has no dimensions. It is a dimensionless quantity. Drag coefficient is used to quantify the resistance of an object in a fluid environment. It is mainly used in air and water.

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