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Physics > Fluid Dynamics > Flashcards

Fluid Dynamics Flashcards

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1
Q

Specific Gravity Equation

A

SG = weight of sample / weight of equal volume of water

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2
Q

What do we use to measure specific gravity?

A

Hydrometer

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3
Q

If the hydrometer measures more than 1000, what happens to the float?

A

Float will rise

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4
Q

If the hydrometer is less than 1000, where does the float sit?

A

The float will sink

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5
Q

If the float is =1000

A

The float is fully immersed in pure water

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6
Q

What is viscosity?

A

Viscosity is the opposition to flow

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7
Q

What happens to the viscosity in a LIQUID if temperature is increased?

A

Viscosity will decrease

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8
Q

What happens to the viscosity in a GAS if temperature is increased?

A

Viscosity will increase

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9
Q

What is the unit for viscosity?

A

Ns/m^2

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10
Q

What does streamlining do?

A

Decreases the friction

Reduces air resistance

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11
Q

How do you work out the total pressure?

A

Total pressure = static pressure + dynamic pressure

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12
Q

What does static pressure depend on?

A

Height

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13
Q

What does dynamic pressure depend on?

A

Flow

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14
Q

How do you find the absolute pressure?

Units?

A

Absolute Pressure = Gauge Pressure + Atmospheric Pressure

Units: N/m^2

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15
Q

At sea level, what is the atmosphere in lbs./inch^2 and in mmHg?

A

14.7 lbs./in^2

760 mmHg

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16
Q

What does Bernoulli’s Principle state?

A

When a fluid is in motion (without energy being added or taken away) :

Potential energy decreases when kinetic energy increases
Pressure decreases when velocity increases

17
Q

What does volume flow rate suggest with Bernoulli’s Principle?

A

A constant flow of fluid through a pipe for 1 minute will give you the same volume of water out as a constant flow of fluid through the same pipe, if squeezed, for one minute.

18
Q

If a pipe is raised higher, what does that mean for the pressure?

A

Pressure will also increase

19
Q

What is the pressure if a fluid determined by?

A

Height

20
Q

Boiling and freezing point of water in degrees Celcius?

A

Boiling point : 100 degrees

Freezing point : 0 degrees

21
Q

Boiling and freezing point of water in Kelvin?

A

Boiling point : 373 K

Freezing point : 273K

22
Q

Boiling and freezing point of water in Farenheit?

A

Boiling point : 212 degrees Farenheit

Freezing point : 32 degrees Farenheit

Physics (6 decks)

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