h&f lecture 4&5

Question 1

what does the greek letter phi represent in the energy equation?

Answer 1

disspation function

Question 2

why is the dissipation function important in compressible flows?

Answer 2

contributes significant viscous heating of fluid

Question 3

where does viscous heating also occur?

Answer 3

incompressible flows, lubrication of bearings and journals

Question 4

what units does species, M have?

Answer 4

kg substance / kg mixture

KgA/Kg(A+B)

Question 5

is speices concentration scalar or vector?

Answer 5

scalar

Question 6

what four terms make up the species concentration equation?

Answer 6

accumlation rate, convection, diffusion and source terms

Question 7

what is an example of a constitutive or particular relationship?

Answer 7

stokes hypothesis is an example

Question 8

what is fick’s law of diffusion?

Answer 8

thermal energy diffusing from high concentration regions to low concentration regions

Question 9

what cana species be quantified in terms of?

Answer 9

mass density and molar concentration

Question 10

what are the units for mass density and molar concentration

Answer 10

kg/m^3 and Kmol/m^3 respectively

Question 11

what is the relationship between mass density, molar concentrastion and molecular mass?

Answer 11

phi i=Mi*ci

Question 12

what is the mass fraction equation?

Answer 12

Mi = phi i/phi

Question 13

what are the units of the diffusion coefficient?

Answer 13

m^2/s

Question 14

what re the units of volumetric source (na) of phi A

Answer 14

kg/s/m^3