Influences for Anisokinetic Sampling on the Measurement of Particle Concentration in Ducts

Abstract

The sampling of particles suspended in a gas stream was to carry out currently with isokinetic sampling. The sampling of particles is expected to be simple if it can be used with some anisokinetic sampling methods. The effects of anisokinetic sampling were tested with a high accuracy dust tunnel, changing the gas velocities in the duct so as to be 5, 7.5, 10m/s, and concentrations of particles in duct so as to be 10, 50, 100mg/m³, respectively. Particles were used with fly ash and talc, which were in a size range of micron meters. In the paper, errors of particle concentration for anisokinetic sampling are determined by the velocity ratio and inertia function α, α is the function of stokes number in a flowing gas stream and in the velocity ratio. The semi-theoretical equation is obtained from the experimental data.