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Engineering Science: Fluids > Fluid Statics > Flashcards

Fluid Statics Flashcards

1
Q

Equation for hydrostatic pressure below surface

A

Hydrostatic pressure = Patm + density * gravity * height

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2
Q

Resultant force on submerged object

A

Resultant force = Pressure at point * Area

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3
Q

Buoyancy equation

A

Buoyancy force = fluid density * gravity * volume of submerged object

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4
Q

How would you determine if a flow is laminar?

A

If it has a Reynolds number of below 2300

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5
Q

How would you determine if a flow is transitional?

A

If it has a Reynolds number between 2300 and 4000

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6
Q

How would you determine if a flow is turbulent?

A

If it has a Reynolds number above 4000

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7
Q

What is the equation for Reynolds number?

A

(Densityvelocitycharacteristic dimension) / dynamic viscosity

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8
Q

How do you calculate characteristic dimension, D

A

D = 4 * cross sectional area/ wetted perimeter

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9
Q

How do you calculate friction factor for laminar flow?

A

f = 64/Re

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10
Q

How do you calculate friction factor for turbulent flow with a smooth pipe?

A

f = 0.3164/Re^0.25

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11
Q

How do you calculate frictional factor for turbulent flow with rough pipe?

A

Hydraulic roughness, e used in haaland approximation

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12
Q

What is the equation for frictional minor loss?

A

Minor frictional loss = Kl * 0.5 * density * average velocity ^2

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13
Q

What is the total head loss for pipe connected in series?

A

Head loss = sum of major frictional loss + sum of minor frictional loss

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14
Q

What is the equation for frictional major loss?

A

Frictional major loss = frictional factor * (length/diameter) * 0.5 * density * average velocity^2

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15
Q

How do you calculate entrance length (Lh) for a laminar pipe?

A

Laminar Lh / D = 0.05 Re

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16
Q

How do you calculate entrance length (Lh) for a turbulent pipe?

A

Turbulent Lh/D = 1.36 Re ^0.25

17
Q

How do you calculate average flow speed?

A

u = Volumetric flow rate/ CSA

18
Q

How do you convert Litres per second to Si

A

x 10^-3

19
Q

What is the equation for work loss

A

Work loss = head loss * mg

20
Q

How to determine the volume flow rate from Change in mass and density

A

Volume flow rate = change in mass / Density

21
Q

Efficiency equation

A

Work useful / w input = efficiency

22
Q

What is the difference between frictional drag & pressure drag?

A

Frictional drag = frictional force due to shear wall stress
Pressure drag = force due to pressure difference arising from change of flow structure

23
Q

How do you work out total drag?

A

Total drag = frictional drag + pressure drag

Engineering Science: Fluids (1 decks)

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