Hslit 1.5[µm] "Slit height"
R 2.3[µm] "Hole radius"
H 1.5[µm] "Membrane thickness"
f0 1[kHz] "Actuation frequency"
AR 0.2 "Hole area coefficient"
W sqrt(pi/(2*sqrt(3))*R^2/AR) "Width unit cell"
area 2*sqrt(3)*W^2 "Area of unit cell"
N 1/area "Holes per area"
air_lambda 6.5e-8[m] "Mean free path, air"
Air_mu 1.81e-5[Pa*s] "Viscosity, air"
Air_rho 1.2[kg/m^3] "Density, air"
Air_c 343[m/s] "Sound speed, air"
Air_Dth 22e-6[m^2/s] "Thermal diffusivity, air"
Nopt sqrt(3/(2*H*Hslit^3)*(AR/2-AR^2/8-log(AR)/4-3/8))*AR/pi "Analytical optimal number of holes"
Ropt (AR/(pi*Nopt))^(1/2) "Analytical optimal radius"
delta_t sqrt(2*Air_Dth/f0) "Thermal boundary layer thickness"