Symbol | Description | Unit |
A | Laser beam area at the surface | m2 |
a | Approximation constant [16] | - |
Cp | Specific heat capacity | kJ/(kg K) |
D | Thermal diffusivity | m2/s |
Dinner | Inner removal diameter | µm |
Douter | Outer removal diameter | µm |
dspot | Laser spot diameter | µm |
G | Green function | - |
H | Heat transfer coefficient | W/(m2∙K) |
I | Laser power density | W/cm2 |
l | Absorption depth | nm |
PL | Laser power | W |
Pabs | Absorbed laser power | W |
r | Laser beam radius | µm |
T | Temperature rise | ˚C |
TBoiling | Electrolyte boiling temperature | ˚C |
Tmodel,peak | Peak surface temperature (Model) | ˚C |
TR,max | Upper limit temperature for a material removal | ˚C |
TR,min | Bottom limit temperature for a material removal | ˚C |
t | Time | s |
tL | Irradiation time | s |
v | Feed velocity | m/s |
X Y Z | Dimensionless coordinates | - |
x y z | Dimensional coordinates | m |
α | Dimensionless quantity (r/l) | - |
αabs | Wavelength related absorption coefficient of Ti | % |
θ | Dimensionless quantity (H・r/κ) | - |
κ | Thermal conductivity | W/(m K) |
λ | Laser wavelength | nm |
ϕ | Integration variable/substitution quantity (τ - τ’) | - |
ρ | Density | Kg/m³ |
τ | Dimensionless time coordinate | - |
τE | Transmission coefficient of the electrolyte | % |
Ψ | Dimensionless temperature rise | - |