Abstract
The evaporation behaviour of droplets changes with their size. Most numerical tools to simulate evaporation phenomena of droplets solve macroscopic models such as the Navier-Stokes equations. These numerical tools have an advantage in computational effort compared to tools solving microscopic models such as the Boltzmann equation. However, macroscopic models lose physical validity for microscopic scales. One goal is therefore to estimate the necessary level of microscopic modelling for droplet evaporation. This requires a tool capable of solving a microscopic model, simulating evaporation of droplets, and which can be used on large computational domains. For this, the Direct Simulation Monte Carlo method is applied, which is capable of capturing microscopic effects on a larger domain. Two functionalities have been added to simulate droplets: a literature-based microscopic evaporation model and spherical moving bodies, which are independent of a body fitted mesh. With these functionalities, droplet size change resulting from evaporation and Brownian motion is simulated. This marks the first steps in order to compare results with macroscopic based simulation tools and estimate the necessary level of microscopic modelling.
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Acknowledgements
The authors thank the German Research Foundation (DFG, Deutsche Forschungsgemeinschaft) for funding this research within the project Droplet Interaction Technologies (DROPIT) of the International Research Training Groups (IRTG-2160).
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Reschke, W., Pfeiffer, M., Fasoulas, S. (2020). Enabling Simulations of Droplets with the Direct Simulation Monte Carlo Method. In: Lamanna, G., Tonini, S., Cossali, G., Weigand, B. (eds) Droplet Interactions and Spray Processes. Fluid Mechanics and Its Applications, vol 121. Springer, Cham. https://doi.org/10.1007/978-3-030-33338-6_5
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