Analysis of the deposition rate on the cooled and uncooled Pt-target indicates that temperature difference between the cooled wall and the hot working gas significantly increases the deposited fraction of the solid material. Data have been obtained on the initial deposition rate d<1.0 μm Mg0(s) particles as a function of target temperature (ca. 980K-1480K) and mainstream gas temperature (ca. 1340K-1420K) by using real time specular reflectance method. These data are used to:
a) show the dorminant role of thermophoresis (particles drift down under the influence of a thermal gradient in the continuum surrounding them) in the mechanism of deposition of submicron particles.
b) compare with recently developed theoretical methods.
c) show temperature ratio T(wall) to T(gas) can play as decisive role in determining mass transfer rates as the mainstream submicron dust loading itself, and
d) assess the utility of specular reflectance method.