- #1

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where [tex]\eta[/tex] is the fluid's dynamic viscosity

Where the drag force comes from ? How does this force occur?

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- Thread starter IPhO' 2008
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- #1

- 44

- 0

where [tex]\eta[/tex] is the fluid's dynamic viscosity

Where the drag force comes from ? How does this force occur?

- #2

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- #3

- 44

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[tex]\rho\pi[/tex]r

This formula come from F[tex]\Delta[/tex]t = m(v-u).

so, F [tex]\alpha[/tex] v

but from Stoke's law F [tex]\alpha[/tex] v.

- #4

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[tex]\rho[/tex] is the density of fluid.

- #5

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- #6

- 12,134

- 161

[tex]\rho\pi[/tex]r^{2}v^{2}

This formula come from F[tex]\Delta[/tex]t = m(v-u).

so, F [tex]\alpha[/tex] v^{2}.

but from Stoke's law F [tex]\alpha[/tex] v.

That is true when collisions among the fluid molecules may be neglected, i.e. the viscosity is small.

For significantly large viscosity, the collisions between fluid molecules modify the force expression. In that case the force is proportional to

In both cases, the force arises from fluid molecules impacting upon the moving object.

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