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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

PORE-SCALE NUMERICAL ANALYSIS OF HYDRODYNAMICS AND CONJUGATE HEAT TRANSFER IN SOLID SPONGES

Get access (open in a dialog) DOI: 10.1615/IHTC16.pma.023409
pages 8109-8116

Аннотация

Solid sponges are open-cell, highly porous foams with a large specific surface area showing very high heat and mass transfer rates at comparatively low pressure drops. Provided that these bi-continuous porous media conduct heat well, they offer superior heat transfer characteristics as compared to conventional packings which are subjected to multiple additional contact heat transfer resistances. This work presents a pore-scale CFD modelling approach to investigate hydrodynamics and heat transfer in sponges and similar bi-continuous porous media. The simulation geometry is derived from micro computed tomography scans of the original porous structure. To obtain reliable numerical results at a reasonable computational cost and to allow the specification of adequate boundary conditions, an elaborate modelling concept has been developed. It has been applied to different sponge types and similar bi-continuous porous media. Conjugate heat transfer modelling considers both the fluid convective and the solid conductive heat transfer contributions. CFD results have been compared to corresponding experimental results for pressure drop and volumetric heat transfer coefficient and showed good agreement. Given the reliability of the CFD model developed, numerical results have been used to provide further in-depth insights into the transport processes prevailing inside such porous media. For example, the influence of different boundary conditions and flow regimes on local momentum and heat transfer has been analyzed. By comparing these results to those gained for similar porous structures, it is possible to identify particularly favorable geometrical features of porous media and to optimize them for specific heat exchanger applications.