Classical Filtration Theory Research Articles

Diurnal,variations of aerosol concentrations inside and above a young spruce stand: modelling and measurements

Aerosol characteristics and aerodynamic conditions above and inside forests are strongly dynamic, especially for landscapes subject to frequent frontal activity and episodic anthropogenic aerosol inflows. Using empirical data of 1-hr time- resolution a non-stationary partial differential equation model (based on K-theory and classical filtration theory for concentration and deposition variations in a forest) is shown reasonably capable of handling such temporal complexity, which is also shown to be reflected in a temporally complex deposition pattern.

Collection of submicron particles by H 2 bubbles

A theoretical analysis is presented to describe the deposition of Brownian particles onto H 2 bubbles (flotation) by analogy with classical filtration theory. Experimentally, it is shown that submicron and smaller particles of MnO 2 are collected by H 2 bubbles without using the special collector or chemicals usually employed in flotation. The experimental technique for determining the total collection efficiency is described. A comparison between the theory and our experiment makes it clear that there are cases in which the simpler filtration theory is adaptable to a complicated flotation analysis. In addition, we find that the collection mechanisms of submicron particles of MnO 2 is predominantly characterized by interception and Brownian diffusion.