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Licentiate seminar

Detailed simulations of droplet evaporation


Defendant Main Advisor Extra Advisor Date
Giandomenico Lupo Christophe Duwig Anders Dahlkild 2017-12-18

Opponent
David Sedarsky, Chalmers University of Technology

Evaluation committee
Outi Tammisola, KTH Mechanics

Abstract

Droplet evaporation (and condensation) is one of the most common instances of multiphase flow with phase change, encountered in nature as well as in technical and industrial applications. Examples include falling rain drops, fogs and mists, aerosol applications like electronic cigarettes and inhalation drug delivery, engineering applications like spray combustion, spray wet scrubbing or gas absorption, spray drying, flame spray pyrolysis. Multiphase flow with phase change is a challenging topic due to the intertwined physical phenomena that govern its dynamics. Numerical simulation is an outstanding tool that enables us to gain insight in the details of the physics, often in cases when experimental studies would be too expensive, impractical or limited. In the present work we focus on simulation of the evaporation of small droplets. We perform simulation of evaporation of a pure and two-component droplet, that includes detailed thermodynamics and variable physical and transport properties. Some of the conclusions drawn include the importance of enthalpy transport by species diffusion in the thermal budget of the system, and the identification and characterization of evaporating regimes for an azeotropic droplet. In the second part we develop a method based on the immersed boundary concept for interface resolved numerical simulation of laminar and turbulent flows with a large number of spherical droplets that undergo evaporation or condensation.
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