Diffusion Deposition on a Cylinder Due to Nearly Parallel Flow

Abstract

The diffusional deposition of the particles in an aerosol on a cylindrical fiber when the aerosol is carried in a slow laminar flow whose mean direction is at an angle to the axis of the fiber is studied by considering the parallel and transverse components of this flow, ft is shown that when the flow is nearly transverse to the fiber, the analysis carried out by Natanson and Stechkina applies. When the flow is nearly parallel to the fiber, the asymptotic method of Stechkina is used to obtain an expression for the contribution to the single fiber diffusion efficiency. This contribution is shown to be somewhat less, but of the same order of magnitude, as that obtained by Natanson and Stechkina for purely transverse flow.