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In many applications deposition of small particles, enhanced by turbulence and temperature gradients, can cause damage to surfaces or lead to heat transfer reduction. The steep velocity and temperature gradients in the turbulent boundary layer are mainly responsible for the deposition processes. Tests, which are performed in a way that aims to exclude heat transfer over the boundaries show in the simulation for the remaining temperature gradient an increase of particle deposition for a log-normally distributed particle size spectrum due to positive thermophoresis. On the other hand, for the same particle size distribution almost no influence of the lift force (according to Saffmann) can be seen in the calculation. In this paper it is shown in the calculation that one deposition model including thermophoresis, but not considering Brownian motion or temperature fluctuations, gives acceptable results for a complete particle spectrum.

Additional information

Authors: KROEGER C, JRC Ispra (IT);DROSSINOS Y, JRC Ispra (IT)
Bibliographic Reference: Paper presented: European Aerosol Conference, Hamburg (DE), September 15-19, 1997
Availability: Available from (1) as Paper EN 41007 ORA
Record Number: 199711569 / Last updated on: 1997-12-09
Original language: en
Available languages: en
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