Unlocking further understanding of the atomization mechanism of a pressurized metered dose inhaler

Myatt, Benjamin J.; Versteeg, Hendrik K.; Hargrave, Graham K.; Long, Edward J.; Gavtash, Barzin; Lewis, David; Church, Tanya; Brambilla, G.

doi:10.1080/02786826.2022.2116305

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Flash boiling is the thermodynamic phenomenon that occurs when a pressurized superheated liquid (i.e., a liquid heated to temperatures above its boiling point without boiling) is exposed to an environment where the ambient pressure is lower than the saturation pressure of the liquid. Flash boiling atomization has various applications ranging from fuel injection in combustion chambers [6] to distillation [7], spray drying [8] or the pharmaceutical industry [9]. Since high temperatures help to reduce the viscosity of liquids or solutions, this method is also used to spray highly viscous liquids.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Deposits Sprayed by a High Power Torch with Flash Boiling Atomization of High-Concentration Suspensions

Amrollahy Biouki,

Ben Ettouil,

C. Liberati

et al. 2024

Materials

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The main objective of this study was to use flash boiling atomization as a new method to inject suspensions with high solid content into the high-power plasma flow. The water-based suspension was prepared with submicron titanium oxide particles with an average size of 500 nm. The investigated solid concentrations were 20, 40, 55 and 70 wt%. Two plasma torches operated at 33, 70 and 110 kW were used to investigate the effect of increasing power on the deposited microstructure and deposition efficiency. At low torch power, the deposition efficiency decreased with increasing solid concentration, and deposits with a high number of unmelted particles were obtained with 70 wt% suspensions. At high torch power, the deposition efficiency increased with increasing solid concentration, and dense deposits were obtained with 70 wt% suspensions. XRD analysis was performed on all deposits to determine the distribution of rutile and anatase phases. The percentage of the anatase phase varied from 35.7% to 66.9%, depending on the power input and solid concentration.

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