Evaporation; Generalized Finite Difference Method; GFDM; Mass- and heat-transfer; MESHFREE; Multi-phase; Water; Computational Mechanics; Civil and Structural Engineering; Numerical Analysis; Modeling and Simulation; Fluid Flow and Transfer Processes; Computational Mathematics
Abstract :
[en] In this paper, a new model for the below-boiling point evaporation process with a meshfree collocation method is developed. In order to capture the phase change process, two different approaches are proposed: multi-phase and single-phase. First, a multi-phase approach is considered, where a novel mass transfer model assumes that the diffusion driven by the vapor concentration gradient in the air phase near the interface is the primary driving force for the mass transfer between phases as both the liquid water and air/vapor phases are simulated. Then, a water-only single-phase approach is also proposed, in which only the liquid water phase is simulated. For this, appropriate free surface boundary conditions are developed based on the convective mass transfer theory to model evaporation and incorporate airflow effects without explicitly simulating the air phase. In order to validate the proposed models, a series of experiments with varying air temperature, relative humidity, and airflow rate is conducted. The numerical results show a good agreement with the evaporation rate measured in the experiments. The multi-phase simulations agree better with the experiments, while the single-phase simulations also produce good results with a much lower computational effort.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Lee, JungHoon ; Technical University of Munich, TUM School of Engineering and Design, Department of Energy and Process Engineering, Institute of Plant and Process Technology, Garching, Germany
Bäder, Dirk; AUDI AG, Ingolstadt, Germany
Rehfeldt, Sebastian; Technical University of Munich, TUM School of Engineering and Design, Department of Energy and Process Engineering, Institute of Plant and Process Technology, Garching, Germany
Eisenträger, Almut; Fraunhofer Institute for Industrial Mathematics ITWM, Kaiserslautern, Germany
Kuhnert, Jörg; Fraunhofer Institute for Industrial Mathematics ITWM, Kaiserslautern, Germany
Michel, Isabel; Fraunhofer Institute for Industrial Mathematics ITWM, Kaiserslautern, Germany
SUCHDE, Pratik ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) ; Fraunhofer Institute for Industrial Mathematics ITWM, Kaiserslautern, Germany
Klein, Harald; Technical University of Munich, TUM School of Engineering and Design, Department of Energy and Process Engineering, Institute of Plant and Process Technology, Garching, Germany
External co-authors :
yes
Language :
English
Title :
Modeling evaporation with a meshfree collocation approach
Publication date :
30 May 2023
Journal title :
Computational Particle Mechanics
ISSN :
2196-4378
eISSN :
2196-4386
Publisher :
Springer Science and Business Media Deutschland GmbH
JungHoon Lee, Sebastian Rehfeldt, Almut Eisenträger, Jörg Kuhnert, Isabel Michel, and Harald Klein would like to acknowledge funding and support from AUDI AG for the large majority of this project. JungHoon Lee would like to thank the colleagues of the corrosion protection and water management department of AUDI AG for their help and support. Pratik Suchde would like to acknowledge support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Actions grant agreement No. 892761.
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