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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-483-0

ISBN Online: 978-1-56700-482-3

4th Thermal and Fluids Engineering Conference
April, 14–17, 2019 , Las Vegas, NV, USA

NUMERICAL ANALYSIS OF HEAT AND MASS TRANSFER IN PACKED BEDS COMPOSED OF VARIABLE SIZE SPHERICAL PARTICLES

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DOI: 10.1615/TFEC2019.fnd.027503

Resumo

Mass and heat flows through packed beds of granular materials (solids) are very complex problems and are still not fully recognised. They are important for a vast of industrial applications, e.g. in fluidised beds, thermal storage systems, catalytic reactors. The aim of this work is to analyse these processes using advanced numerical simulations and investigate to what extent they can be controlled by structure of the beds. The applied numerical model provides the temperature distributions and their variability over the time inside the solid objects and around them. It is based on the unsteady equation of heat conduction (3D) and the Navier-Stokes equations for modelling the fluid flow in between the layers made of solid objects. Complex structures of the beds are modelled using immersed boundary technique (IB), which allows the use of Cartesian meshes for objects with very complicated shapes. The correctness of applied numerical model has been verified by numerical results obtained for simplified geometries using body-fitted meshes. In the present work we focus on the heat and mass transfer inside packed beds build of spheres with different diameters and variable distribution. We analyse how these parameters affect the efficiency of mass and heat transfer. The obtained results reveal occurrence of very complex flow structures (recirculation and stagnation regions) and point out some preferred configurations of the beds.