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- Giulia Finotello
- Eindhoven University of Technology 1 Multiphase Reactor Group, Department of Chemical Engineering and Chemistry, , Eindhoven, The Netherlands
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- Johan T. Padding
- Delft University of Technology 2 Intensified Reaction and Separation Systems, Department of Process and Energy, , Delft, The Netherlands
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- Niels G. Deen
- Eindhoven University of Technology 3 Multiphase and Reactive Flows Group, Department of Mechanical Engineering, , Eindhoven, The Netherlands
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- Alfred Jongsma
- Tetra Pak CPS 4 , Heerenveen, The Netherlands
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- Fredrik Innings
- Tetra Pak CPS 4 , Heerenveen, The Netherlands
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- J. A. M. Kuipers
- Eindhoven University of Technology 1 Multiphase Reactor Group, Department of Chemical Engineering and Chemistry, , Eindhoven, The Netherlands
説明
<jats:p>A complete knowledge of the effect of droplet viscosity on droplet-droplet collision outcomes is essential for industrial processes such as spray drying. When droplets with dispersed solids are dried, the apparent viscosity of the dispersed phase increases by many orders of magnitude, which drastically changes the outcome of a droplet-droplet collision. However, the effect of viscosity on the droplet collision regime boundaries demarcating coalescence and reflexive and stretching separation is still not entirely understood and a general model for collision outcome boundaries is not available. In this work, the effect of viscosity on the droplet-droplet collision outcome is studied using direct numerical simulations employing the volume of fluid method. The role of viscous energy dissipation is analysed in collisions of droplets with different sizes and different physical properties. From the simulations results, a general phenomenological model depending on the capillary number (Ca, accounting for viscosity), the impact parameter (B), the Weber number (We), and the size ratio (Δ) is proposed.</jats:p>
収録刊行物
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- Physics of Fluids
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Physics of Fluids 29 (6), 067102-, 2017-06-01
AIP Publishing
