Nomenclature.

Variable	Description [unit]	Variable	Description [unit]
ρ	Density [kg m−3]	k	Thermal conductivity [W (m−1 K−1)]
ε	Relative permittivity	C p	Heat capacity [J (kg−1 K−1)]
σ	Electrical conductivity [S m−1]	p	Pressure [Pa]
D	Diffusion coefficient [m2 s−1]	L	Characteristic length [m]
T	Temperature [K]	u	Velocity vector [m s−1]
c	Concentration [mol m−3]	N	Flux vector [mol (m−2 s−1)]
Re	Reynolds number	μ	Dynamic viscosity [Pa s]
∇·	Divergence operator	∇	Gradient operator
∇×	Curl operator
H	Magnetic field intensity [A m−1]	E	Electric field intensity [V m−1]
B	Magnetic flux density [T]	D	Electric flux density [C m−2]
A	Magnetic potential vector [V s m−1]	J	Electric current density [A m−2]
ω	Angular frequency [rad s−1]	j	Imaginary unit
F ext	External force density	F emf	Electromagnetic force density
F gra	Gravity force density	F buo	Buoyancy force
G	Surface irradiation [W m−2]	G m	Mutual surface irradiation [W m−2]
F amb	Ambient view factor	T amb	Ambient temperature [K]
ε s	Surface emissivity	J	Surface radiosity