Quiz

Question 1

The Conservation of mass (continuity) equation may be derived from the GENERAL TRANSPORT EQUATION by setting the transport variable, phi, and source term, S respectively

Answer 1

phi = 1

S= 0

Question 2

In Fick’s law of diffusion the units of the diffusion coefficient are:

Answer 2

m^2/s

Question 3

In an non-Newtonian fluid the shear stress is directly proportional to:

Answer 3

The Strain rate to the power of an exponent not equal to 1

Question 4

In the Energy Equation the term responsible for viscous heating is often called:

Answer 4

The dissipation function

Question 5

An example of a TRUE SOURCE TERM in the energy equation is:

Answer 5

Nuclear Fission

Question 6

In the derivation of the Energy Equation the RATE OF WORK acting on the control volume surface may be express as the product of:

Answer 6

Force and Velocity

Question 7

A model of the flow which considers a fluid element fixed in space

Answer 7

Eulerian

Question 8

An example of a CONSTITUTIVE RELATIONSHIP is

Answer 8

Stokes hypothesis

Question 9

The constant of proportionality in Fick’s law of Diffusion is

Answer 9

The mass diffusivity

Question 10

The following term

duu/dx

can be used to describe

Answer 10

The convection of acceleration

Question 11

A definition of fully developed, laminar pipe flow is as follows:

Answer 11

All axial gradients are zero except the pressure gradient

Question 12

In the General Transport Equation the operator GRAD does the following

Answer 12

Converts a scalar to a vector

Question 13

In the Navier-Stokes equation, a NORMAL STRESS term contains the following (where the symbols have their usual meaning)

Answer 13

du/dx

Question 14

What does the following term represent?

mu/rho (d^2u/dx^2)

Answer 14

The diffusion of u in the x direction for constant viscosity

Question 15

The Stokes’ relatioship for shear stress and strain-rate may be express as

txy = tyx = mu(du/dy+dv/dx)

The equality:

txy = tyx

Is true because of:

Answer 15

Conservation of angular momentum

Question 16

Fourier’s law of conduction may be express as:

q = - kA(dT/dx)

Where the negative sign is necessary in order to

Answer 16

Ensure that the 2nd law of thermodynamics is upheld.

Question 17

The GENERAL TRANSPORT EQUATION consists of the following terms:

Answer 17

Transient + Convection + Diffusion + Source

TRANny CONVicts DIe SOURly

Question 18

An example of a non-Newtonian fluid is:

Answer 18

Blood

Question 19

∇.u = 0

may be expanded into what form?

Answer 19

du/dx + dv/dy + dw/dz = 0

Question 20

∇.u = 0

Describes what?

Answer 20

The steady state continuity equation for incompressible flow

Question 21

An example of a Newtonian fluid is

Answer 21

Water, Air, Alcohol, Milk, Glycerol, Thin Motor Oil

Question 22

Define Newtonian Fluid

Answer 22

A fluid that all viscous stresses arising in the flow are, at all points, linear to the local strain rate and rate of change of its deformation over time.

Question 23

In the GENERAL TRANSPORT EQUATION what does phi mean?

Answer 23

Mass, Momentum, Energy, Species Concentration.

MASSive MOMENTs ENERGise SPECky Cunts

Question 24

What does the transient terms in GTE mean?

Answer 24

Accumulation Rate of the variable, phi.

Can be expressed in terms of Convection, diffusion and source terms.

Question 25

What does The Convection Terms in GTE depend on?

Answer 25

Convection Term only becomes important when the variables in partial derivatives vary in direction

Question 26

Convection Terms as "equations" are:

Answer 26

d(rho*u^2)/dx d(rho*v*u)/dy d(rho*u*e)/dx

Question 27

Diffusion process is characterised by a dependency on what?

Answer 27

a gradient of a particulat variable and occurs at a molecular level.

Question 28

State Fourier's Law of Heat Conduction.

Answer 28

q = -k (dT/dx)

Question 29

What does phi represent in the energy equation?

Answer 29

Dissapation function

Question 30

Why is the dissipation function important in compressible flows?

Answer 30

Contributes significant viscous heating of fluid

Question 31

Where does viscous heating also occur?

Answer 31

Incompressible flows, lubrication of bearings and journals

Question 32

What units does species, M have?

Answer 32

kg substance/ kg mixture | KgA/Kg(A+B

Question 33

Is species concentration scalar or vector?

Answer 33

Scalar

Question 34

what four terms make up the species concentration equation?

Answer 34

transient, convection, diffusion, source | TRANny CONVicts Die SOURly

Question 35

What is an example of a constitutive or particular relationship?

Answer 35

Stoke's hypothesis

Question 36

What is Fick's Law of diffusion?

Answer 36

Thermal energy diffusing from high concentration regions to low concentration regions.

Question 37

What can a species be quantified in terms of?

Answer 37

Mass density and molar concentration.

Question 38

What are the units for mass density and molar concentration?

Answer 38

kg/m^3 and Kmol/m^3

Question 39

what is the relationship between mass density, molar concentration and molar mass?

Answer 39

phi i = Mi * ci

Question 40

What are the units of the diffusion coefficient?

Answer 40

m^2/s

Question 41

What are the units of volumetric source (na) of phi A

Answer 41

kg/s/m^3

Question 42

What is heat transfer?

Answer 42

Heat transfer is thermal energy in transit- as a result of temperature differences

Question 43

What is momentum transfer?

Answer 43

Acceleration or deceleration of fluid particles as a result of motive or retardive forces.

Question 44

What is mass transfer?

Answer 44

Mass transfer is mass in transit as a result of concentration differences?

Question 45

Phase change example?

Answer 45

Water evaporating: Energy is taken from the water droplet (cooling) allowing it to break liquid bond, this energy turns into laten heat as the liquid into a gas, this energy is released as the gas is condensed back into a liquid

Question 46

Is the model Eularian or Lagrangian?

Answer 46

Eulerian: Fixed in space Lagrangian: Moves in space (abcdEFg...LMnop...)

Question 47

delta phi = ?

Answer 47

Net convection + net diffusion + source/sink +effects on CV surface (shear/normal stresses)

Question 48

What are the four physical fundamental principles?

Answer 48

Mass, Energy, Species Concentration, momentum

Question 49

What forces act on the CV to allow us to apply momentum equation?

Answer 49

Body forces (gravitational, magnetic) Surface Forces ( Shear and normal stresses pushing and tugging).

Question 50

What type of diffusion occurs and what direction is it in when shear stress are present on 2d body?

Answer 50

Diffusion of momentum in the high to low shear direction (look for terms du/dy, dv/dx etc.)

Question 51

What does the term u*du/dx represent?

Answer 51

Convection of u in x direction

Question 52

What does the term v*du/dy represent?

Answer 52

Convection of u in the y direction

Question 53

What does the term u/p(d^2u/dx^2) represent?

Answer 53

Diffusion of u in the x direction due to normal stresses for constant velocity

Question 54

What does the term | u/p(d^2u/dy^2)

Answer 54

Diffusion of u in the y direction due to shear stresses for constant velocity.