| 1. |
- Villanueva, Walter, et al.
(författare)
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A diffuse-interface model of reactive wetting with intermetallic formation
- 2012
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Ingår i: Acta Materialia. - : Elsevier. - 1359-6454 .- 1873-2453. ; 60:9, s. 3799-3814
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Tidskriftsartikel (refereegranskat)abstract
- A diffuse-interface model of reactive wetting with intermetallic formation is developed that incorporates fluid flow, phase change and solute diffusion. The model is based on the total molar Gibbs energy of a ternary system with four phases. Numerical simulations were performed using a mesh-adaptive finite element method, revealing the complex behavior of the reactive wetting process. The model was verified against equilibrium states derived from the classical phase diagram and from interface energy considerations. Dynamic results show that the intermetallic can either precede or follow the spreading liquid droplet, depending on the time and the choice of interface energy and kinetic coefficients. Despite this difference, the spreading rate was not affected for the cases considered.
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| 2. |
- Villanueva, Walter, et al.
(författare)
-
A Multicomponent and Multiphase Model of Reactive Wetting
- 2010
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Ingår i: Proceedings of 7th International Conference on Multiphase Flow.
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Konferensbidrag (refereegranskat)abstract
- A diffuse-interface model of reactive wetting with intermetallic formation is presented. The model incorporates fluidflow, solute diffusion, and phase change that are based on the total molar Gibbs energy of a ternary system with fourphases. Numerical simulations were performed successfully revealing the complex behavior of the reactive wettingprocess that include nucleation and growth of an intermetallic phase, and initial rapid spreading followed by a slowand progressive spreading. In addition, the nucleation and growth of the intermetallic phase is shown to be directlyinfluenced by its kinetic coefficient or the interface energy associated with it.
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| 3. |
- Villanueva, Walter, et al.
(författare)
-
Effect of phase change and solute diffusion on spreading on a dissolving substrate
- 2009
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Ingår i: Acta Materialia. - : Elsevier BV. - 1359-6454 .- 1873-2453. ; 57:20, s. 6022-6036
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Tidskriftsartikel (refereegranskat)abstract
- Dissolutive wetting is investigated numerically using a diffuse-interface model that incorporates fluid flow, solute diffusion and phase change. A range of materials parameters are investigated: (1) permitting recovery of the hydrodynamic limit by suppressing the dissolution of the substrate and (2) evaluating the role of diffusion. The time history of droplet size, droplet concentration and angles between the interfaces are given. For cases in which convection dominates, the dynamics of spreading agrees with a known hydrodynamic model for spreading of inert fluids. A phase change increases wetting speed, due to a condensation that takes place near the triple junction. There is also a strong dependence of the wetting kinetics on the solute diffusivities. Details of composition changes during spreading are also discussed, such as the composition path of the bulk liquid probed at different locations in the drop. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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