Droplet collisions of water and milk in a spray with Langevin turbulence dispersion

Giulia Finotello (Corresponding author), Johan Padding, Kay Buist, Alfred Jongsma, Fredrik Innings, Hans Kuipers

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Uittreksel

In this work we investigate droplet-droplet collision interactions in a spray system using an Eulerian-Lagrangian model with subgrid turbulence dispersion. The effect of different droplet viscosities on the type and frequency of droplet collision is investigated, knowledge of which is essential for industrial processes such as spray drying for production of milk powder. The dispersed phase is treated with Lagrangian transport of droplets and the turbulent self-induced gas flow using large eddy simulation (LES). A stochastic Direct Simulation Monte Carlo (DSMC) method is used to detect collisions between droplets. The outcome of a binary collision is described by a collision boundary models for water and milk concentrates. A turbulence dispersion model, based on the Langevin equation, accounts for the stochastic subgrid fluid velocity fluctuations along the droplet trajectory. We compare the spray dynamics with and without droplet interactions and turbulence dispersion. For a spray with typical droplet size of 50 μm, we find that the turbulence dispersion model enhances the total collision frequencies by approximately 25%. The performance of the turbulent dispersion model is tested by investigating the rate of collisions for different milk concentrates. The evolution of size distributions inside the spray is strongly influenced by the complementary effects of collision boundary models and turbulence dispersion.

Keywords
Eulerian-Lagrangian modelcoalescenceseparationbouncingLangevin subgridscale model
TaalEngels
Pagina's154-167
TijdschriftInternational Journal of Multiphase Flow
Volume114
DOI's
StatusGepubliceerd - mei 2019

Vingerafdruk

milk
sprayers
Turbulence
turbulence
collisions
Water
water
Milk
Spray drying
large eddy simulation
Large eddy simulation
drying
gas flow
Monte Carlo method
Powders
Flow of gases
trajectories
interactions
Monte Carlo methods
viscosity

Citeer dit

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title = "Droplet collisions of water and milk in a spray with Langevin turbulence dispersion",
abstract = "In this work we investigate droplet-droplet collision interactions in a spray system using an Eulerian-Lagrangian model with subgrid turbulence dispersion. The effect of different droplet viscosities on the type and frequency of droplet collision is investigated, knowledge of which is essential for industrial processes such as spray drying for production of milk powder. The dispersed phase is treated with Lagrangian transport of droplets and the turbulent self-induced gas flow using large eddy simulation (LES). A stochastic Direct Simulation Monte Carlo (DSMC) method is used to detect collisions between droplets. The outcome of a binary collision is described by a collision boundary models for water and milk concentrates. A turbulence dispersion model, based on the Langevin equation, accounts for the stochastic subgrid fluid velocity fluctuations along the droplet trajectory. We compare the spray dynamics with and without droplet interactions and turbulence dispersion. For a spray with typical droplet size of 50 μm, we find that the turbulence dispersion model enhances the total collision frequencies by approximately 25{\%}. The performance of the turbulent dispersion model is tested by investigating the rate of collisions for different milk concentrates. The evolution of size distributions inside the spray is strongly influenced by the complementary effects of collision boundary models and turbulence dispersion.KeywordsEulerian-Lagrangian modelcoalescenceseparationbouncingLangevin subgridscale model",
author = "Giulia Finotello and Johan Padding and Kay Buist and Alfred Jongsma and Fredrik Innings and Hans Kuipers",
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Droplet collisions of water and milk in a spray with Langevin turbulence dispersion. / Finotello, Giulia (Corresponding author); Padding, Johan; Buist, Kay; Jongsma, Alfred; Innings, Fredrik; Kuipers, Hans.

In: International Journal of Multiphase Flow, Vol. 114, 05.2019, blz. 154-167.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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AU - Padding,Johan

AU - Buist,Kay

AU - Jongsma,Alfred

AU - Innings,Fredrik

AU - Kuipers,Hans

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AB - In this work we investigate droplet-droplet collision interactions in a spray system using an Eulerian-Lagrangian model with subgrid turbulence dispersion. The effect of different droplet viscosities on the type and frequency of droplet collision is investigated, knowledge of which is essential for industrial processes such as spray drying for production of milk powder. The dispersed phase is treated with Lagrangian transport of droplets and the turbulent self-induced gas flow using large eddy simulation (LES). A stochastic Direct Simulation Monte Carlo (DSMC) method is used to detect collisions between droplets. The outcome of a binary collision is described by a collision boundary models for water and milk concentrates. A turbulence dispersion model, based on the Langevin equation, accounts for the stochastic subgrid fluid velocity fluctuations along the droplet trajectory. We compare the spray dynamics with and without droplet interactions and turbulence dispersion. For a spray with typical droplet size of 50 μm, we find that the turbulence dispersion model enhances the total collision frequencies by approximately 25%. The performance of the turbulent dispersion model is tested by investigating the rate of collisions for different milk concentrates. The evolution of size distributions inside the spray is strongly influenced by the complementary effects of collision boundary models and turbulence dispersion.KeywordsEulerian-Lagrangian modelcoalescenceseparationbouncingLangevin subgridscale model

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