Errors in concentration measurement of aerosol particles in duct are caused by an anisokinetic sampling. Though these errors have been mainly evaluated with mass median diameter
Dp50, they may be estimated by considering size distribution of particles in duct. Assuming the flow without interaction between particles, our equation on
Dp50 and several other equations were applied to the case with size distribution of particles. Values of a coefficient As in our equation were determined from 0.1 to 1 in the results. Davies and Belvaev eauations with size distribution described the experimental data better than those with
Dp50.
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