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Area (m
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Acceleration (m/s
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Local speed of sound (m/s, ft/s) |
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Concentration (mass/volume, moles/volume) |
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Drag coefficient, defined different ways (dimensionless) |
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Heat capacity at constant pressure, volume (J/kg-K, Btu/lb
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Diameter;
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Hydraulic diameter (m, ft) |
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Mass diffusion coefficient (m
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Total energy, activation energy (J, kJ, cal, Btu) |
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Mixture fraction (dimensionless) |
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Force vector (N, lb
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Drag force (N, lb
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Gravitational acceleration (m/s
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Gr | Grashof number
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Total enthalpy (energy/mass, energy/mole) |
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Heat transfer coefficient (W/m
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Species enthalpy;
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Radiation intensity (energy per area of emitting surface per unit solid angle) |
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Mass flux; diffusion flux (kg/m
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Equilibrium constant = forward rate constant/backward rate constant (units vary) |
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Kinetic energy per unit mass (J/kg, Btu/lb
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Reaction rate constant, e.g.,
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Thermal conductivity (W/m-K, Btu/ft-h-
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Boltzmann constant (
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Mass transfer coefficient (units vary); also
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Length scale (m, cm, ft, in) |
Le | Lewis number
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Mass (g, kg, lb
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Mass flow rate (kg/s, lb
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Molecular weight (kg/kgmol, lb
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M | Mach number
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Nu | Nusselt number
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Pressure (Pa, atm, mm Hg, lb
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Pe | Peclet number
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Pr | Prandtl number
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Flow rate of enthalpy (W, Btu/h) |
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Heat flux (W/m
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Gas-law constant (8.31447
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Radius (m, ft) |
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Reaction rate (units vary) |
Ra | Rayleigh number
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Re | Reynolds number
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Total entropy (J/K, J/kgmol-K, Btu/lb
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Species entropy;
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Sc | Schmidt number
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Mean rate-of-strain tensor (s
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Temperature (K,
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Time (s) |
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Free-stream velocity (m/s, ft/s) |
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Velocity magnitude (m/s, ft/s); also written with directional subscripts (e.g.,
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Volume (m
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Overall velocity vector (m/s, ft/s) |
We | Weber number
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Mole fraction (dimensionless) |
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Mass fraction (dimensionless) |
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Permeability, or flux per unit pressure difference (L/m
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Thermal diffusivity (m
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Volume fraction (dimensionless) |
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Coefficient of thermal expansion (K
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Porosity (dimensionless) |
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Ratio of specific heats, c
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Change in variable, final
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Delta function (units vary) |
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Emissivity (dimensionless) |
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Lennard-Jones energy parameter (J/molecule) |
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Turbulent dissipation rate (m
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Void fraction (dimensionless) |
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Effectiveness factor (dimensionless) |
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Rate exponents for reactants, products (dimensionless) |
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Radiation temperature (K) |
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Molecular mean free path (m, nm, ft) |
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Wavelength (m, nm, Å, ft) |
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Dynamic viscosity (cP, Pa-s, lb
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Kinematic viscosity (m
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Stoichiometric coefficients for reactants, products (dimensionless) |
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Density (kg/m
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Stefan-Boltzmann constant (5.67
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Surface tension (kg/m, dyn/cm, lb
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Scattering coefficient (m
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Stress tensor (Pa, lb
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Shear stress (Pa, lb
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Time scale, e.g.,
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Tortuosity, characteristic of pore structure (dimensionless) |
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Equivalence ratio (dimensionless) |
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Thiele modulus (dimensionless) |
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Angular velocity;
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Specific dissipation rate (s
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Solid angle (degrees, radians, gradians) |
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Diffusion collision integral (dimensionless) |