Generation of monodisperse aerosols by combining aerodynamic flow-focusing and mechanical perturbation

Figures & data

Figure 1. Schematic diagram of FMAG design.

Figure 2. Schematic diagram of flow-focusing nozzle.

Figure 3. Highly monodisperse droplets of IPA (images taken by a high-speed camera with 32,000 pps, 0.28-µs exposure time). X: droplet-to-droplet spacing; L: distance from orifice exit to breakup point.

Figure 4. Size distribution of IPA monodisperse droplets measured by PDI.

Table 1. FMAG IPA operational table.

Q (mL/h)	FF Δp (psi)	Dj (µm)	f (kHz)	Dd (μm)	Qdilution (L/min)
1.5	0.9–1.0	8.6	120–230	15–20	5–8
2	0.9–1.0	10.0	110–140	20–23	5–8
4	0.9–1.0	14.1	110–130	25–28	5–8
8	0.9–1.0	19.9	80–125	33–38	8–10
12	0.7–0.8	26.2	45–70	45–52	8–10
18	0.7–0.8	32.1	40–65	53–62	10–15
24	0.7–0.8	37.1	35–66	58–72	10–15

Q: liquid flow rate, FF ΔP: flow-focusing pressure drop, D_j: jet diameter, f: vibrating frequency, D_d: droplet diameter, Q_dilution: dilution air flow rate.

Table 2. FMAG UPW operational table.

Q (mL/h)	FF Δp (psi)	Dj (µm)	f (kHz)	Dd (μm)	Qdilution (L/min)
2	1.8–1.9	9.2	120–200	17–21	5–10
4	1.8–1.9	13.1	70–170	23–31	8–10
8	1.8–1.9	18.5	70–160	30–40	10–15
12	1.4–1.5	24.1	50–95	41–50	15–20
18	1.4–1.5	29.5	50–80	51–65	20–25
24	1.4–1.5	34.1	40–75	56–69	20–25

Q: liquid flow rate, FF ΔP: flow-focusing pressure drop, D_j: jet diameter, f: vibrating frequency, D_d: droplet diameter, and Q_dilution: dilution air flow rate.

Figure 5. Highly monodisperse droplets of UPW (images taken by a high-speed camera with 32,000 pps, 0.28-µs exposure time).

Figure 6. Jet diameters for IPA at 1.0 psi.

Figure 7. Jet diameters for UPW at 1.8 psi.

Figure 8. APS measurements of oleic acid particles generated by FMAG.

Figure 9. APS measurements of NaCl particles generated by FMAG.

Figure 10. SEM of NaCl particles generated by FMAG.