Investigation on Mesh Sensitivity of a Transient Model for Nozzle Clogging
A transient model for nozzle clogging has been developed and successfully validated against a laboratory experiment. Key steps of clogging are considered: transport of particles by turbulent flow towards the nozzle wall; interactions between fluid flow and nozzle wall, and the adhesion of the particle on the wall; the growth of the clog layer and its interaction with the flow. The current paper is to investigate the mesh (size and type) sensitivity of the model in both two and three dimensions. It is found that the algorithm for clog growth alone excluding the flow effect is insensitive to the mesh type and size, but the calculation including flow becomes sensitive to the mesh quality. The use of 2D meshes leads to overestimation of the clog growth because the 3D nature of flow in the boundary layer cannot be properly solved by 2D calculation. 3D simulation with tetrahedron mesh can also lead to an error estimation of the clog growth. A mesh-independent result can be achieved with hexahedral mesh, or at least with triangular prism (inflation layer) for near-wall regions.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1315859Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 369
 C. Henry, J.-P.P. Minier, and G. Lefèvre, “Towards a description of particulate fouling: From single particle deposition to clogging,” Adv. Colloid Interface Sci., vol. 185– 186, pp. 34–76, Dec 2012.
 H. Bai, and B.G. Thomas, “Effects of clogging, argon injection, and continuous casting conditions on flow and air aspiration in submerged entry nozzles,” Metall. Mater. Trans. B., vol. 32, pp. 707–722, Aug 2001.
 M. Mohammadi-Ghaleni, M. Asle Zaeem, J.D. Smith, and R. O’Malley, “Comparison of CFD simulations with experimental measurements of nozzle clogging in continuous casting of steels,” Metall. Mater. Trans. B., vol. 47, pp. 3384–3393, Dec 2016.
 M. Long, X. Zuo, L. Zhang, and D. Chen, “Kinetic modeling on nozzle clogging during steel billet continuous casting,” ISIJ Int., vol. 50, pp.712–720, May 2010.
 P. Ni, L. Jonsson, M. Ersson, and P.G. Jönsson, “Turbulent flow phenomena and Ce2O3 behavior during a steel teeming process,” ISIJ Int., vol. 53, pp. 792–801, Jan 2013.
 E. Gutiérrez, S. Garcia-Hernandez, and J. Barreto, “Mathematical Analysis of the Dynamic Effects on the Deposition of Alumina Inclusions inside the Upper Tundish Nozzle,” ISIJ Int., vol. 56, pp. 1394–1403, Aug 2016.
 L. Zhang, Y. Wang, and X. Zuo, “Flow transport and inclusion motion in steel continuous-casting mold under submerged entry nozzle clogging condition,” Metall. Mater. Trans. B., vol. 39, pp. 534–550, Aug 2008.
 H. Barati, M. Wu, A. Kharicha, A. Ludwig, “A Transient Model for Nozzle Clogging,” Powder Technol., accepted, 2018.
 ”ANSYS-FLUENT help,” Acad. Res. Release. 14, 2015.
 M. Guingo, and J.-P. Minier, “A stochastic model of coherent structures for particle deposition in turbulent flows,” Phys. Fluids., vol. 20, p. 53303, May 2008.
 F. Heuzeroth, J. Fritzsche, E. Werzner, M.A.A. Mendes, S. Ray, D. Trimis, and U.A. Peuker, “Viscous force - An important parameter for the modeling of deep bed filtration in liquid media,” Powder Technol., vol. 283, pp. 190–198, Oct 2015.
 K. Sasai, and Y. Mizukami, “Mechanism of alumina adhesion to continuous caster nozzle with reoxidation of molten steel,” ISIJ Int., vol. 41, pp. 1331–1339, 2001.
 K. Uemura, M. Takahashi, S. Koyama, and M. Nitta, “Filtration mechanism of non-metallic inclusions in steel by ceramic loop filter,” ISIJ Int., vol. 32, pp. 150–156, 1992.