Handling contact points in reactive CFD simulations of heterogeneous catalytic fixed bed reactors. (17th February 2016)

• Record Type: Journal Article
• Authors: Rebughini, Stefano; Cuoci, Alberto; Maestri, Matteo
• Is Part Of: Chemical engineering science. Volume 141(2016)
• Page Start: 240
• Page End: 249
• Publication Date: 2016-02-17
• Subjects: Computational Fluid Dynamics -- Discrete Element Method -- Fixed bed reactors -- Contact points -- Gas–solid reactor -- Catalysis; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2015.11.013
• Languages: English
• ISSNs: 0009-2509

Abstract

Abstract: The mesh generation is a crucial step for Computational Fluid Dynamic (CFD) simulations and incorrect numerical descriptions of the geometry may strongly affect the reliability and the accuracy of the results. This is especially true in handling the contact points in random packed bed of spheres. In this respect, we provide a systematic investigation of the treatment of the contact points for reactive CFD simulations of gas–solid packed beds of spheres. In particular, building on previous literature results on radial heat transfer and pressure drop simulations, we extend and assess the bridge method to reaction at surfaces. At this scope, we first analyze a regular bed of spheres in laminar conditions (Re~80). This regular packed bed and the laminar flow regime allow for a direct and feasible meshing of the contact points, thus giving the possibility to perform explicit comparisons between meshes with and without bridges. In doing so, we identify guidelines that are then extended and tested to the meshing of a random packed bed reactor. In this way, we identify a meshing protocol, which can be adopted to properly describe surface reactivity in packed bed reactors along with a concomitant sound description of pressure drops and heat transfer. Graphical abstract: Highlights: The problem of contact points in reacting CFD of gas–solid reactors is assessed. The bridge method is extended to the situation of reaction at surfaces. A meshing protocol for surface chemistry in packed bed reactors is presented.