Journal
DRYING TECHNOLOGY
Volume 40, Issue 4, Pages 697-718Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07373937.2021.1955706
Keywords
Dynamic pore-network model; multi-physics simulation; two-phase flow in porous media; evaporation and drying; pore-network Navier-Stokes coupling
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [SFB 1313, 327154368]
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The research introduces a fully coupled pore-network/free-flow model for providing pore-scale insight into drying processes. By solving the Navier-Stokes equations and dynamically coupling the multi-physics model in the free-flow region and porous domain, it offers a detailed temporal resolution of drying processes. Numerical examples demonstrate the model's ability to cover a wide range of physical processes relevant for drying and show the mutual interaction of the two subregions.
We present a fully coupled pore-network/free-flow model providing pore-scale insight into drying processes. We solve the Navier-Stokes equations with component transport in the free-flow region, coupled to a dynamic two-phase, two-component pore-network model (PNM) in the porous domain. The dynamic multi-physics model allows to temporally resolve drying processes in-between capillary equilibrium states. All simulations are non-isothermal and use pressure- and temperature-depended fluid properties. Carefully chosen coupling conditions and a monolithic solver ensure local conservation of mass, momentum, and energy fluxes, in particular at the interface between both model domains. We solve for wetting and non-wetting fluid pressure fields and consider advective gas transport in the network. Numerical examples demonstrate that the coupled model is able to cover a wide range of physical processes relevant for drying and show the mutual interaction of the two subregions. The model is implemented in the modular open-source framework DuMux such that extensions are straight-forward.
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