Simultaneous particle and vapor deposition in a laminar boundary layer

Filippov, A. V.

doi:10.1016/s0021-9797(02)00046-2

Cited by 9 publications

(27 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We shall assume that the carrier gas is incompressible. This leads to simpler equations and asymptotic expressions (Neu et al 2009) but it also overestimates the particle deposition rates; see Filippov (2003) for the case of heterogeneous condensation. For wall temperatures larger thanT ∞ /2 this effect is not too large, and our asymptotic theory is applicable to more realistic models including compressibility of the carrier gas.…”

Section: Modelmentioning

confidence: 99%

“…Hence the basic hypothesis of a free molecular condensation regime is applicable. Then the droplets, which grow from the nucleus size (which can be ignored), are much smaller than the mean free path, and therefore in a stationary flow we have (Castillo & Rosner 1988;Filippov 2003)…”

Section: Modelmentioning

confidence: 99%

“…When there are solid particles in the carrier gas, the supersaturated vapours condense on them and they are carried to cold walls thermophoretically (Gökoglu & Rosner 1986;Castillo & Rosner 1988, 1989Neu, Bonilla & Carpio 2009). This heterogeneous condensation is important in aerosol formation (Davis 1983;Friedlander 2000;Peeters, Luijten & van Dongen 2001), fouling and corrosion in biofuel plants (Pyykönen & Jokiniemi 2003), outside vapour deposition processes used for making optical fibres (Filippov 2003;Tandon & Murtagh 2005), chemical vapour deposition, vapour condensation and aerosol capture by cold plates or rejection by hot ones (Rosner 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Gökoglu & Rosner (1986), Castillo & Rosner (1988, 1989, Filippov (2003) and Neu et al (2009) considered heterogeneous condensation in the case of diluted vapours in a carrier gas and a diluted suspension of solid particles upon which the vapour may condense. Castillo & Rosner (1988, 1989) study a simple thermophysical model in which the carrier gas is considered to be incompressible, the Soret and Dufour effects are ignored and the particles and droplets move towards the wall by thermophoresis (Davis 1983;Zheng 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Castillo & Rosner (1988, 1989) study a simple thermophysical model in which the carrier gas is considered to be incompressible, the Soret and Dufour effects are ignored and the particles and droplets move towards the wall by thermophoresis (Davis 1983;Zheng 2002). Gökoglu & Rosner (1986) and Filippov (2003) deal with more complicated thermophysical models in which the carrier gas is compressible, its viscosity has an algebraic dependence on temperature and the Soret effect is included. In all cases, the presence of vapours and suspended solid particles does not affect the laminar boundary layer flow of the carrier gas, which is described by coupled ordinary differential equations in a similarity variable.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Theory of homogeneous vapour condensation and surface deposition from boundary layers

Camejo¹,

Bonilla²

2012

J. Fluid Mech.

View full text Add to dashboard Cite

Homogeneous condensation of vapours mixed with a carrier gas in the stagnation point boundary layer flow near a cold wall is considered. There is a condensation region near the wall with supersaturated vapour. Assuming that the surface tension times the molecular area is much larger than the thermal energy far from the wall, droplets are nucleated exclusively in a narrow nucleation layer where the Zeldovich flux of clusters surpassing the critical nucleus size is at a maximum. The vapour condenses in the free molecular regime on the droplets, which are thermophoretically attracted to the wall. Unlike the narrow condensation region for heterogeneous condensation on solid particles, in the case of homogeneous condensation the condensation region is wide even when the rate of vapour scavenging by droplets is large. A singular perturbation theory of homogeneous vapour condensation in boundary layer flow approximates very well the vapour and droplet density profiles, the nucleation layer and the deposition rates at the wall for wide ranges of the wall temperature and the scavenging parameter B. A key point in the theory is to select a trial vapour number density profile among a one parameter family of profiles between an upper and a lower bound. The maximum of the Zeldovich flux for supercritical nuclei provides the approximate location of the nucleation layer and an approximate droplet density profile. Then the condensate number of molecules and the vapour density profile are calculated by matched asymptotic expansions that also yield the deposition rates. For sufficiently large wall temperatures, a more precise corrected asymptotic theory is given.

show abstract

Section: Modelmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%