Abstract
A simple model for the diffusiophoresis in the lung was tested. It consists essentially of two channels, which have been divided by a membrane filter. In both channels aerosol was flowing with a different carrying gas. Gas exchange through the membrane filter occurred and caused different deposition rates on each side of the filter. For equimolar counterdiffusion the deposition on the side of the heavier gas predominated. For model experiments with a “respiratory quotient” of 0·85 (volume-ratio of exhaled CO 2 to inhaled O 2) more particles have been deposited on the side of the lighter gas, but the deposition rate was much lower than in the case of equimolar counterdiffusion. The experimental results are supported by theoretical calculations. The effect of diffusiophoresis is small compared to other deposition mechanisms in the lung.
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