Numerical simulations of fluid dynamics in carrier structures for catalysis: characterization and need for optimization

X-ray micro computed tomography characterization of cellular SiC foams for their applications in chemical engineering

“…The relatively main appearance of dodecahedrons (ca. 26%) supports the general adoption of the Weaire-Phelan structure or the tetrakaidecahedron geometry (based on Kelvin unit cells) as the representation of cellular structures [44][45][46][47][48][49][50]. However, the predominant presence of round shapes, such as cylinder and torus, suggests that the unit cell topology in the S30 sample is more complex than the idealized dense polyhedron packings [48][49][50].…”

“…Findings on the shape of unit cells in SiC foams are different from previous studies where idealized geometrical cells (e.g. dodecahedrons) were normally proposed as model unit cells for investigating transport phenomena through cellular foams [44][45][46][47][48][49][50][51][52]. The characterization of cellular SiC foams by μ-CT revealed the accurate morphological information of cells in such materials, which is helpful to the generation of precise and photo-realistic computer models of cellular foams to simulate transport characteristics through them.…”

Microtomography-based numerical simulations of heat transfer and fluid flow through β -SiC open-cell foams for catalysis

“…Such flow features cannot be observed in CFD simulation of idealised periodic structures, such as the cubic lattice, the Kelvin cell and the diamond structure [31]. Stagnant regions with zero velocity are also clearly identified for all flow fields in either Darcy or Forchheimer regimes.…”

“…Therefore, unit cells such as regular pentagonal dodecahedra [27,28], Kelvin cells (the tetrakaidecahedron geometry) [29][30][31], diamond structures [31] and other idealised geometrical cells [32,33] were proposed for pore-scale investigation of the general effects in idealised foam structures based on unit cells, e.g., modelling mass transfer [27], heat transfer [28] and hydrodynamics within foam-based geometries [29][30][31][32][33]. Simulation works based on abstracted foam models are convenient to extract basic characteristics, in the hope of resembling the ones of real foam structures, for designing applications based on foams.…”

From Oss Cad to Bim for Cultural Heritage Digital Representation

“…Carl Schultz et al (2015), used FreeCAD to demonstrate the way a parametric model may be constrained by the spatial aspects of conceptual design specifications and higher-level semantic design requirements, involving a combination of topological, visibility, and movement constraints, Guimaraes et al (2016) used FreeCAD for 3D modelling geometry and assembling objects and Horneber et al (2014) used FreeCAD to build ".stl" files of different 3D structures.…”