Anisokinetic sampling of particulate in duct flows

A theoretical model was developed to predict the error in the particulate concentration measurements due to anisokinetic sampling of flowing aerosols. The model is developed for flows with a uniform velocity profile upstream from the sampling probe. The probe wall was assumed infinitely thin and the particles were assumed to be spherical and monodisperse. The predictions of the theoretical model were generally in good agreement with analytical and experimental data. By curve fitting the results of the theoretical model, a correlation was developed which permits the calculation of the concentration ratio for velocity ratios between 0.25 and 3.5 and Stokes numbers between 0.02 and 0.50.