Fluid Properties Flashcards by aditi singh

Q

What is the shear force in static fluid?

A

Zero

Shear force in a static fluid is zero because the fluid is at rest and there is no relative motion.

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Q

Density is

A

Mass/volume

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Q

Density Units

A

Kg/m3

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Q

Specific Weight

A

Row g

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Q

Weight

A

Row g V

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Q

Compressibility

A

-dV/VdP

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Q

Force

A

Viscosity x Area x Velocity/ h

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Q

Kinematic Viscosity

A

Dynamic viscosity/ density

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Q

Dynamic Viscosity Unit

A

Kg/m.s

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Q

Kinematic Viscosity Unit

A

m²/s

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Q

As pressure Increases, kinematic Viscosity in liquid

A

Doesn’t Change

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Q

As pressure Increases, Dynamic Viscosity in gas

A

Doesn’t Change

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Q

As pressure Increases, kinematic Viscosity in gas

A

Decreases

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Q

With increase in temperature, Vapour Pressure…

A

Increases

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Q

Torque

A

Power x angular velocity
Force x radius

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Q

Surface tension

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A

F/L
Force/perimeter

Q

Surface tension SI unit

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A

N/m

Q

Surface tension is due to

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A

Unbalanced cohesive forces

Q

Pressure difference in droplets ll

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A

2 sigma / R

Q

Pressure difference in bubble

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A

4 sigma/ R

Q

Pressure difference in air bubble

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A

2 sigma / r

Q

Pressure difference in liquid jet

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A

Sigma/R

Q

Capillary rise is due to

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A

Adhesion

Q

Capillary fall is due to

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A

Cohesion

Capillary rise formula

4 sigma cos@ / wd

Rise in parallel plate

h = 2 sigma cos@/wt

Rise in coaxial tubes

h = 2 sigma Cos@ / w [Ro-Ri]