A diffusion method for determining sizes of nanoparticles suspended in a gasстатья
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Аннотация:The diffusion deposition of particles suspended in a gas in diffusion batteries composed of cylindrical fibers is considered. It is assumed that the particle-size spectrum is described by a lognormal distribution. It is shown in the asymptotic approximation that the dependences of the penetration coefficients on the diffusion battery parameters and flow velocity plotted for particles with the same geometrical mean sizes, but different degrees of polydispersity, in fact intersect at the same point. It is also shown that, at small nanoparticle size r (on the order of several nanometers), when the diffusion coefficient is D ∼ r −2, the intersection point corresponds to a penetration coefficient of about 0.37. The results obtained agree with the numerical data.