Abstract

This paper presents the final experimental results of a long term investigation into the deposition of fog droplets onto the guide blades of low pressure steam turbines. An experimental and theoretical study has been made into the diffusive deposition of sub-micron aerosols, through laminar and turbulent boundary layers, onto a heated and an unheated guide blade. The effect of thermophoresis on the deposition of particles with mass-median diameters of 0. 23 and 0. 06 mu m has been measured using fluorimetric techniques. It is generally concluded that studies concerning the deposition of sub-micron aerosols must not overlook the effect of thermophoresis since it can quickly overwhelm the process of diffusiophoresis.