aerosol-properties-governing-equations-explanation Externalforces-Thermoforesis

In a non-isothermal system with relatively cool walls, thermophoresis causes aerosol particles to move toward and deposit on the walls. Such thermophoretic deposition plays an important role in a variety of applications such as the production of ceramic powders in high temperature aerosol flow reactors, and the production of optical fiber preforms by the modified chemical vapor deposition (MCVD) process (Wiemer et al., 1993 and Friedlander, 2000). For some applications, this particle deposition is desirable (i.e., the manufacture of optical waveguide prefoms by the MCVD process); however, in other applications it is an impediment (i.e. the production of ceramic powders, such as aluminum nitride, in aerosol flow reactors).

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