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118 > Fluids > Flashcards

Fluids Flashcards

1
Q

What are the 3 Difference Modes of Heat Transfer

A

Conduction, Convection, Radiation

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2
Q

Heat Transfer always acts ______________________________
Rate of heat transfer increases ________________________________

A

Heat Transfer always acts from a higher temperature to a lower temperature
Rate of heat transfer increases as temperature difference increases (Heat gradient)

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3
Q

What are the Dimensions of Momentum, Force, Pressure & Viscocity

A
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4
Q

Draw a dimensionless plot for the following graph

For the Red Line , use the graph to find v at time 3s

For the Blue Line, use the graph to find V at 0.75s

A
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5
Q

What is Reynolds Number Formula, What does it Represent

What are the Reynolds number ranges for Turbulent Transitional and Laminar Flow

Show how Reynolds Number is Dimensionless

A
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6
Q

Explain Geometric, Kinematic and Dynamic Similarities

A
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7
Q

Find the Dependant and independent Dimentionless values and Draw a Dimensionless Plot for Drag

A
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8
Q

What is the Formula for Static Pressure

A
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9
Q

Explain what is being measured at each of these pentometers

A

Left - Static Pressure - Pressure exerted by parts of the fluid that are stagnant or a constant velocity (Pressure of static fluid compared to atmospheric pressure)

Middle - Total Pressure - Pressure exerted by the dynamic parts of the fluid coming to a stop (pressure of dynamic fluid compared to atmospheric pressure)

Right - Dynamic Pressure - Pressure exerted by the by the dynamics parts of the fluid (pressure of dynamic fluid compared to static pressure, takes into account the kinetic energy of the particles

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10
Q

How is shear stress calculated for a Newtonian Fluid

How does Dynamic Viscocity relate to Kinematic viscosity

A
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11
Q

Explain what a Streamtube and Streamline are

And any rules associated to them

A
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12
Q

Explain the law that governs happens at the entrance and exit of a stream tube

A
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13
Q

Derive Bernoulli’s Equation

A
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14
Q

What is the formula for Lift an Drag of an Aerofoil

A
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15
Q

What is Betz’s Law and the formula associated to power of a wind turbine

A
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16
Q

What does the wind speed need to be in the wind tunnel to achieve dynamic similarity

Explain at potential problem with the model

A

Wind speed is approaching half the speed of sound
Compressibility or the air will be different at this speed, resulting in different air behaviour

17
Q

The Drag force was 35kn on the model
Find the velocity of the water and the force of drag of the full model

A
18
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21
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118 (5 decks)

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