Modeling high-speed viscous liquid sheet atomization

Senecal, P. K.; Schmidt, David P.; Nouar, Idriss; Rutland, Christopher J.; Reitz, Rolf D.; Corradini, Michael L.

doi:10.1016/s0301-9322(99)00057-9

Cited by 312 publications

(182 citation statements)

References 23 publications

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“…This is a common approximation made in phenomenological modeling of atomizers in cases where only one flow velocity scale is available (Lefebvre 1989;Razzaghi 1989;Schmidt et al 1999;Senecal et al 1999). …”

Section: Mathematical Formulationmentioning

confidence: 99%

“…The theory of disintegration and breakup of flat liquid sheets involves a dispersion equation for the evolution of initially small disturbances. Early analyses by York et al (1953) and Dombrowski and Johns (1963) formed the basis of the linear instability sheet analysis (LISA) model of Senecal et al (1999) used in this work.…”

Section: Variant 2: Breakup Of Liquid Sheetmentioning

confidence: 99%

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Transient aerodynamic atomization model to predict aerosol droplet size of pressurized metered dose inhalers (pMDI)

Gavtash

Versteeg

Hargrave

et al. 2017

Aerosol Science and Technology

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Pressurized metered dose inhalers (pMDI) produce large numbers of droplets with smaller sizes than 5 mm to treat asthma and other pulmonary diseases. The mechanism responsible for droplet generation from bulk propellant liquid is poorly understood, mainly because the small length scales and short time scales make it difficult to characterize transient spray formation events. This article describes the development and findings of a numerical atomization model to predict droplet size of pharmaceutical propellants from first principles. In this model, the velocity difference between propellant vapor and liquid phase inside spray orifice leads to formation of wave-like instabilities on the liquid surface. Two variants of the aerodynamic atomization model are presented based on assumed liquid precursor geometry: (1) cylindrical jet-shaped liquid ligaments surrounded by vapor annulus; (2) annular liquid film with vapor flow in the core. The growth of instabilities on the liquid precursor surfaces and the size of the subsequently formed droplets are predicted by numerical solutions of dispersion equations. The droplet size predictions were compared with phase doppler anemometry (PDA) data and the predictions were in good agreement with the number mean diameter D 10 , which is representative of the respirable droplets. The temporal behavior of droplet size production was captured consistently well during the period of the first 95% of the propellant mass emission. The outcome of our modeling activities also suggests that, in addition to saturated vapor pressure of the propellant, its viscosity and surface tension are also key properties that govern pMDI droplet size. EDITORWarren Finlay

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Section: Mathematical Formulationmentioning

confidence: 99%

Section: Variant 2: Breakup Of Liquid Sheetmentioning

confidence: 99%

Transient aerodynamic atomization model to predict aerosol droplet size of pressurized metered dose inhalers (pMDI)

Gavtash

Versteeg

Hargrave

et al. 2017

Aerosol Science and Technology

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“…In this case the system is unstable. The studies by previous researchers [11,[13][14][15] have shown that the ratio of the amplitude at break-up to that of the initial disturbance is approximately constant (ln ða n =a 0 Þ % 12). On the basis of this finding, one can calculate the break-up time t n and the film radial extent (film length) x n r once the growth rate b r and radial velocity u r of the sheet beyond the disk are known.…”

Section: Instability Of a Liquid Sheetmentioning

confidence: 99%

“…Li and Tankin [19] gave a detailed derivation of a dispersion relation for a viscous sheet moving into an inviscid gas medium. More recently, Senecal et al [13] summarised the wave theories of sheet disintegration and carried out a more practicable analysis. In centrifugal atomisation using a rotating disk, metallic melt is delivered onto the centre of a disk.…”

Section: Growth Rate and Fastest-growing Wave Numbermentioning

confidence: 99%

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Prediction of powder particle size during centrifugal atomisation using a rotating disk

Li¹,

Deng

2007

Science and Technology of Advanced Materials

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The centrifugal atomisation of metallic melts using a rotating disk is an important process for powder production and spray deposition. The theoretical prediction of powder particle size is desirable for the design of atomisers. In this paper, wave theory was applied to analyse the disintegration of metallic melts in the film disintegration regime during centrifugal atomisation using a rotating disk. A mathematical model was proposed to predict the spray parameters. The governing equation for the fastest-growing wave number was developed and solved numerically. The effect of the variation in film thickness during film extension was taken into account. Film length and powder particle size were calculated and compared with available experimental data in the literature, and a good agreement was achieved. The influence of the break-up parameter was studied, and it is shown that the break-up parameter is not sensitive to the predicted powder particle size. Both simulated results and experimental data showed that fine powders can be produced by increasing disk speed. r

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Spraying and Atomizing of Liquids

Walzel¹

2010

Ullmann's Encyclopedia of Industrial Chemistry

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Modeling high-speed viscous liquid sheet atomization

Cited by 312 publications

References 23 publications

Transient aerodynamic atomization model to predict aerosol droplet size of pressurized metered dose inhalers (pMDI)

Transient aerodynamic atomization model to predict aerosol droplet size of pressurized metered dose inhalers (pMDI)

Prediction of powder particle size during centrifugal atomisation using a rotating disk

Spraying and Atomizing of Liquids

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