Using quasi-DNS to investigate the deposition of elongated aerosol particles in a wavy channel flow

• Published in: Computers & fluids Vol. 124; pp. 78 - 85
• Main Authors: Lecrivain, Gregory, Rayan, Rohan, Hurtado, Antonio, Hampel, Uwe
• Format: Journal Article
• Language: English
• Published: 01.01.2016
• Subjects: Aerosols; Channel flow; Channels; Computer simulation; Deposition; Elongation; Fluid flow; Turbulent flow
• ISSN: 0045-7930
• DOI: 10.1016/j.compfluid.2015.10.012

In gas-cooled high temperature reactors, the diffusion of the fission products into the graphite matrix causes a radioactive contamination of the carbonaceous dust. The contaminated graphite aerosol particles often exhibit large aspect ratios and deposit in complex geometries, which hinders a detailed experimental investigation. The use of quasi Direct Numerical Simulation (quasi-DNS) to simulate the turbulent flow in nuclear reactors has seen an increased interest over the last few years. The capabilities of a quasi-DNS to simulate the transport and the deposition of elongated particles in a wavy channel flow are presently tested. It is shown that quasi-DNS effectively predicts deposition and that, unlike the deposition in a plane channel flow, the particle aspect ratio has no significant effect on the overall deposition rate in a wavy channel. It is suggested that in numerical studies of particle deposition on a significantly roughened channel, the particle can be assumed to be spherical without affecting the results of the deposition study.