Table 1 Frequency, median diameter and ratio of median diameter over capillary wavelength, calculated with Kelvin’s formula.

From: Size distributions of droplets produced by ultrasonic nebulizers

Device

Frequency

D50 (ÎĽm)

D50/λ

SAWN small droplets

9.6 MHz

1.1

0.39

Nebulizer chip

105 ± 5 kHz

9.5

0.17

Mist maker

1700 ± 50 kHz

5.6

0.65

Device

Frequency

D 50 ( ÎĽm )

D 50 / \(\ell \)

SAWN big droplets

—

56

0.16

  1. For the big droplets produced by the SAWN, the wavelength \(\ell \) of the surface acoustic waves of the chip is used, which is set by the distance of the metallic strips of the IDT.
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