A stochastic model for solid particle dispersion in a nonhomogeneous turbulent field

The influence of an anisotropic Langevin dispersion model on the prediction of micro- and nanoparticle deposition in wall-bounded turbulent flows

“…In some models, the time increment of the fluid velocity along a discrete particle trajectory is expressed using a conventional Langevin-type equation derived for the fluid case, where an artificial mean drift correction is added to avoid any spurious accumulation of fluid particles in regions of low turbulent kinetic energy (Bocksell & Loth, 2006;Dehbi, 2008;Iliopoulos, Mito, & Hanratty 2003;Mito & Hanratty, 2004). Such models are derived from an original idea of Thomson (1987) who introduced the so-called 'well mixed condition' as a basic constraint in order to assess the validity and physical consistency of a dispersion model.…”

A stochastic Langevin model of turbulent particle dispersion in the presence of thermophoresis

“…Following Iliopoulos et al (2003), the normalized Langevin equation in the boundary layer along the ith coordinate is written as:…”

“…The CRW is capable of accurately describing the main features of turbulent particle dispersion in isothermal inhomogeneous flows as shown by e.g. Iliopoulos and Hanratty (1999), Hanratty (2002, 2004), Iliopoulos et al (2003), Bockell and Loth (2006), and most recently Dehbi (2008). The main goal of this investigation is to extend the Langevin model to describe turbulent fluid velocity fluctuations in wallbounded geometries when thermophoresis is active.…”

Gas-Liquid Flow in Pipelines

“…One of the striking results of measurements of the deposition process in annular flows is the observed marked decrease in the deposition constant at relatively small concentrations. This has prompted extensive studies of dispersion and deposition (135,153,158,159,166,169,171,203,224,226,227,229,234,235,239,240,241). Measurements of dropsize have been made as an adjunct to these studies (199,216,220,225).…”