Page 14 - Advanced Thermodynamics for Engineers, Second Edition
P. 14
xxiv NOTATION
Distance
x
Thermodynamic force
X
Mass fraction
y
Valency
z
Greek characters
a Degree of dissociation
a [A]/[A]e
a Branching multiplication coefficient
a Molecular thermal diffusivity
a Crank angle (in internal combustion engines)
a Constant volume period in dual combustion cycle
b Coefficient of thermal expansion
b Constant pressure period for diesel or dual combustion cycles
b [B]/[B]e
d Increment in – usually used for indefinite integral, e.g. work (W), heat (Q)
d [D]/[D]e
ε Potential difference, voltage
ε Eddy diffusivity
ε Air–fuel ratio (by mass)
ε A,B Seebeck coefficient for material pair A, B
D Increment in – usually used for indefinite integral, e.g. work (W), heat (Q)
DH a Atomisation energy
DH f Enthalpy of formation
DH() Dissociation energy
ε Degree of reaction
ε Air–fuel ratio of mixture
Heat exchanger effectiveness
E
k Ratio of specific heats (cp/cv)
l Electrical conductivity
l Equivalence ratio ¼ ε stotic =ε
m Dynamic viscosity
m Joule–Thomson coefficient
m Chemical potential
m Electrochemical potential
n Kinematic viscosity
Peltier coefficient for material pair A, B
p A,B
q Entropy generation per unit volume
s Thomson coefficient
Isentropic temperature ratio
sr
Pressure ratio for reheat
sR
n Stoichiometric coefficient
g [C]/[C]e
g Ratio of maximum to minimum temperature in cycle
h Efficiency
Isentropic efficiency of intake
h i
