name

expression

value

description

f0

28 [kHz]

28000 Hz

Driving frequency

c0

343 [m/s]

343 m/s

Speed of sound

lambda0

c0/f0

0.01225 m

Wavelength

Dt

2 * lambda0

0.0245 m

Transducer diameter

Dr

3 * lambda0

0.03675 m

Reflector diameter

H

5 * lambda0/2

0.030625 m

Height

dvisc

0.22 [mm] * sqrt(100 [Hz]/f0)

1.3148E−5 m

Viscous boundary layer thickness

d_p

lambda0/10

0.001225 m

Particle diameter

rho_p

500 [kg/m³]

500 kg/m³

Particle density

rho_f

1.2 [kg/m³]

1.2 kg/m³

Fluid density (air)

mu_f

1.8e−5 [Pa * s]

1.8E−5 Pa・s

Fluid viscosity (air)

a0

1.5e6 [m/s²]

1.5E6 m/s²

Normal acceleration of transducer