α	heat transfer coefficient, W/(m2K)
λ	thermal conductivity, W/(mK)
μ	dynamic viscosity, Ns/m2
ν	kinematic viscosity, m2/s
θ	superheat, K
ρ	density, kg/m3
σ	surface tension, N/m
a	fin width, m
Ar	Archimedes number
C	constant, -
Cu	copper
Eh	enhancement ratio
g	gravitational acceleration, m/s2
h	height/groove depth, m
l	liquid
L	distance, m
n	constant, -
Nu	Nusselt number
p	constant, -
Pr	Prandtl number
q	heat flux, W/m2
r	heat of vaporisation, J/kg
Re	Reynolds number
s	width of a single cell in the tunnel, m
Sa	surface roughness, µm
sat	value at the saturated state
t	pulse duration
T	temperature, K
w	tunnel width, m
v	vapor; scanning velocity, mm/s
z	width of the tunnel opening, m.