| A |
Chemical species |
| Ac |
Cross-sectional area (m2) |
| Ap |
Total external surface area of particle (m2) |
| ap |
External surface area of catalyst per unit bed volume (m2/m3) |
| a |
Area of heat exchange per unit volume of reactor (rrr1) |
| ac |
External surface area per volume of catalyst pellets (m2/m3) |
| B |
Chemical species |
| BA |
Flux of A resulting from bulk flow (mol / m2 · s) |
| Bo |
Bodenstein number |
| C |
Chemical species |
| Ci |
Concentration of species i(mol/dm3) |
| Çpi |
Heat capacity of species i at temperature T (cal/gmol · K) |
| Cpi |
Mean heat capacity of species i between temperature T0 and temperature T (cal/mol · K) |
| Ĉpi |
Mean heat capacity of species i between temperature TR and temperature T (cal/mol · K) |
| c |
Total concentration (mol/dm3) (PDF Chapter 14) |
| D |
Chemical species |
| Da |
Damköhler number (dimensionless) |
| DAB |
Binary diffusion coefficient of A in B (dm2/s) |
| Da |
Dispersion coefficient (cm2/s) |
| De |
Effective diffusivity (dm2/s) |
| DK |
Knudsen diffusivity (dm2/s) |
| D* |
Taylor dispersion coefficient |
| E |
Activation energy (cal/gmol) |
| (E) |
Concentration of free (unbound) enzyme (mol/dm3) |
| Fi |
Molar flow rate of species i (mol/s) |
| Fi0 |
Entering molar flow rate of species i (mol/s) |
| f |
volumetric flow rate ratio, υ/ υ0 |
| G |
Superficial mass velocity (g / dm2 · s) |
| Gi |
Rate of generation of species i (mol/s) |
| Gοi(T) |
Gibbs free energy of species i at temperature T (cal/gmol· K) |
| Hi (T) |
Enthalpy of species i at temperature T (cal/mol i) |
| Hi0(T ) |
Enthalpy of species i at temperature T0 (cal/mol i) |
| Hοi |
Enthalpy of formation of species i at temperature TR (cal/gmol i) |
| h |
Heat transfer coefficient (cal /m2 · s · K) |
| JA |
Molecular diffusive flux of species A (mol/m2 · s) |
| KA |
Adsorption equilibrium constant |
| Kc |
Concentration equilibrium constant |
| Ke |
Equilibrium constant (dimensionless) |
| Kp |
Partial pressure equilibrium constant |
| k |
Specific reaction rate (constant) |
| kc |
Mass transfer coefficient (m/s) |
| Mi |
Molecular weight of species i (g/mol) |
| mi |
Mass of species i(g) |
| Ni |
Number of moles of species i (mol) |
| n |
Overall reaction order |
| Nu |
Nusselt number (dimensionless) |
| Pe |
Peclet number (PDF Chapter 17) |
| Pi |
Partial pressure of species i (atm) |
| Pr |
Prandtl number (dimensionless) |
| Q |
Heat flow from the surroundings to the system (cal/s) |
| R |
Ideal gas constant |
| Re |
Reynolds number |
| r |
Radial distance (m) |
| rA |
Rate of generation of species A per unit volume (gmol A/s · dm3) |
| –rA |
Rate of disappearance of species A per unit volume (mol A/s · dm3) |
| −r′A |
Rate of disappearance of species A per mass of catalyst (mol A/g · s) |
| −r′′A |
Rate of disappearance of A per unit area of catalytic surface (mol A/m2 · s) |
| S |
An active site (Chapter 10) |
| (S) |
Substrate concentration (gmol/dm3) (Chapter 7) |
| Sa |
Surface area per unit mass of catalyst (m2/g) |
| SD/U |
Instantaneous selectivity (Chapter 8) |
| S˜D/U |
Overall selectivity of D to U |
| Sc |
Schmidt number (dimensionless) (Chapter 10) |
| Sh |
Sherwood number (dimensionless) (Chapter 10) |
| SV |
Space velocity (s-1) |
| T |
Temperature (K) |
| t |
Time (s) |
| U |
Overall heat transfer coefficient (cal /m2 · s · K) |
| V |
Volume of reactor (dm3) |
| V0 |
Initial reactor volume (dm3) |
| υ |
Volumetric flow rate (dm3/s) |
| υ0 |
Entering volumetric flow rate (dm3/s) |
| W |
Weight of catalyst (kg) |
| WA |
Molar flux of species A (mol /m2 · s) |
| X |
Conversion of key reactant, A |
| Yi |
Instantaneous yield of species i |
| Y˜i |
Overall yield of species i |
| y |
Pressure ratio P / P0 |
| yi |
Mole fraction of species i |
| yi0 |
0 Initial mole fraction of species i |
| Z |
Compressibility factor |
| z |
Linear distance (cm) |
