Speaker
Description
Local thermal non-equilibrium (LTNE) can play a crucial role in porous-media heat transfer, particularly in applications such as transpiration cooling [1], fuel cells [3] , and geothermal systems [2]. Hereby, the commonly used assumption of instantaneous heat transfer between phases (local thermal equilibrium, LTE) might break down under strong temperature gradients or pronounced contrasts in thermal properties between the phases. To investigate validity of this assumption under different conditions, modeling and accounting for the heat transfer between different phases is crucial.
This poster presentation will showcase our recent work on the influence of different non-dimensional parameters on LTNE in fully saturated porous media. We will present pore-scale results obtained with a coupled pore-network model [4], which takes into account the pore structure by idealized geometries and accounts for the heat transfer between the solid and fluid phases. Additionally, we will provide a brief overview of corresponding results on the REV scale and recent developments in coupled free-flow/porous-medium models for LTNE.
| References | [1] Wolfgang Dahmen et al. “Numerical simulation of transpiration cooling through porous material”. In: International journal for numerical methods in fluids 76.6 (2014), pp. 331–365. doi: https://doi.org/10.1002/fld.3935. [2] Sahar Hamidi et al. “Critical review of the local thermal equilibrium as- sumption in heterogeneous porous media: Dependence on permeability and porosity contrasts”. In: Applied Thermal Engineering 147 (2019), pp. 962– 971. doi: https://doi.org/10.1016/j.applthermaleng.2018.10.130. [3] Jenn Jiang Hwang and P.Y. Chen. “Heat/mass transfer in porous elec- trodes of fuel cells”. In: International Journal of Heat and Mass Transfer 49.13 (2006), pp. 2315–2327. issn: 0017-9310. doi: https://doi.org/10.1016/j.ijheatmasstransfer.2005.11.021. [4] Timo Koch et al. “A (Dual) Network Model for Heat Transfer in Porous Media: Toward Efficient Model Concepts for Coupled Systems from Fuel Cells to Heat Exchangers”. en. In: Transport in Porous Media 140.1 (Oct. 2021), pp. 107–141. issn: 0169-3913, 1573-1634. doi: 10.1007/s11242- 021-01602-5. |
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| Country | Germany |
| Student Awards | I would like to submit this presentation into the Earth Energy Science (EES) and Capillarity Student Poster Awards. |
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