Constants and Conversion Factors - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 383

TABLE B.1 (CONTINUED)
Meanings of Symbols

Symbol Meanings

u flow velocity

v 0 flow rate of fuel without air preheating

v a flow rate of fuel

V velocity of uniform flow upstream

W bandwidth parameter in Equation 2.22, molecular weight

X positions in coordinate

Y positions in coordinate in Section 2.2, mass rate in Section 2.5

Y mass rate

G 0
H 0

standard free energy

standard heat of reaction

T temperature difference

V , ∆ v velocity difference

t division of time

x division of x coordinate

3

the pentagamma function

α ratio of the recirculated heat to the total heat contained in the recirculated gas flow

α

k , β k

the integrals of the soot volumetric fraction over the path length ( L - S k ) and
( S k +1 - 0)

β mass transfer number in Equation 2.34

β mass transfer number

δ ij Kronecker's delta

m ·

mass flow rate

η efficiency

thermal conductivity

µ coefficient of viscosity

ν wave length

υ radiation wave number

ω mass fraction

i

— F ij * shape factor under consideration with radiation and reflection of surface

φ equivalence ratio, concentration fluctuation

φ CG overall heat transfer coefficient (total absorptivity)

φ CH overall heat transfer coefficient calculated by Equation 5.3

φ i the production rate

ρ density

σ Stefan-Boltzmann constant

τ time constant

τ ν τ ν

, spectral soot and gas emissivity

S the mean formation rate

ε dissipation rate of turbulence energy

ε C emissivity of heated surface

ε H emissivity of heating surface

ε λ monochromatic emissivity

ξ heat exchange coefficient