Newton’s law of viscosity, • Pressure and temperature ...

[Pages:35]? Newton's law of viscosity, ? Pressure and temperature dependence of

viscosity

MPD/FFO/Lect_3

viscosity,

MPD/FFO/Lect_3

Viscosity

? Viscosity is a property that represents the internal resistance of a fluid to motion.

? Ethanol ? Water ? Honey ? Sludge ? Slurry ? Pastes

MPD/FFO/Lect_3

MPD/FFO/Lect_3

Newton's Law of Viscosity

Velocity Gradient = U/Y

MPD/FFO/Lect_3

Velocity gradient

MPD/FFO/Lect_3

Newton's Law of Viscosity

Shear stress acts tangentially to the surface (F=tangential force).

X F

Area

Force

F

A

= shear force tangential area

MPD/FFO/Lect_3

Newton's Law of Viscosity

? Newton's law of viscosity states that

"Shear stress is directly proportional to velocity gradient"

du

dy

= ? du

dy

? = Viscosity of the fluid

1 Poise = 1g/cm. s

MPD/FFO/Lect_3

Unit of ? Kg/m.s Poise Pa.s

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